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.he SYSLIB User and Reference Manual .fo 1 - Introduction Page # .pn 1 SYSLIB -- An Integrated Library of Assembly Language Utility Subroutines for use with the Microsoft M80 Assembler 1.0 Introduction 1.01 What is SYSLIB? SYSLI┬á (SYSteφ LIBrary⌐ i≤ ß collectioε oµ ove≥ 13░ subrouì tine≤ whicΦ arσ designeΣ t∩ providσ t∩ thσ CP/═ 8080/Z8░ assembl∙ ì languagσá programme≥ ß se⌠ oµ function≤ upoε whicΦ hσá caεá builΣ ì hi≤ programs« Thi≤ librar∙ i≤ intendeΣ t∩ relievσ thσ programme≥ ì oµá thσ tasδ oµ frequentl∙ "reinventinτ thσ wheeló anΣ t∩ providσ ì hiφ witΦ aε environmen⌠ oµ reliablσ tool≤ whicΦ encourage≤ strucì tureΣ programminτ a⌠ thσ assembl∙ languagσ level. EacΦá subroutinσ withiε SYSLI┬ caε bσ vieweΣ a≤á ßá reliablσ ì "blacδ box.ó Thσ subroutine≤ iε SYSLI┬ arσ completel∙ documenteΣ ì withiεá thi≤ 112½ pagσ manua∞ anΣ thσ SYSLIBx.HL╨ files¼á anΣ thσ ì programme≥á i≤ consistentl∙ provideΣ witΦ thσ followinτá informaì tion: 1. Name of Subroutine 2. Function it performs 3. What its inputs are 4. What its outputs are 5. What registers are affected by it 6. What other library routines it calls upon 7. What errors can occur and how it handles them Thσ routine≤ withiε SYSLI┬ arσ designeΣ t∩ worδ togethe≥ anΣ ì complemen⌠ eacΦ other«á Paramete≥ passinτ i≤ consisten⌠á betweeε ì thσ variou≤ subroutines╗á Fo≥ instance¼á al∞ routine≤ whicΦ neeΣ ì t∩á bσá passeΣ ß pointe≥ t∩ ß Filσ Contro∞ Blocδ arσ passeΣá tha⌠ ì pointe≥ iε thσ D┼ registe≥ pair«á A≤ ß genera∞ rule¼ iµ ß regisì te≥ i≤ no⌠ returneΣ a≤ aε outpu⌠ froφ thσ SYSLI┬ subroutine¼ theε ì it≤ valuσ i≤ no⌠ affecteΣ (i⌠ ha≤ thσ samσ valuσ wheε thσ routinσ ì i≤ exiteΣ a≤ i⌠ haΣ wheε thσ routinσ wa≤ called). SYSLI┬á itselµá i≤ ß librar∙ oµ relocatablσá objec⌠á module≤ ì createΣá iεá thσ Microsof⌠ M8░ relocatablσá objec⌠á format«á Al∞ ì subroutine≤ withiε SYSLI┬ arσ groupeΣ withiε functionally-relateΣ ì modules«á Oncσá ß routinσ i≤ referenceΣ (b∙ thσ EX╘ statemen⌠ iε ì thσ M8░ assembl∙ languagσ program)¼á it≤ modulσ i≤ loadeΣ anΣá i⌠ ì i≤á availablσá t∩ thσ programme≥ b∙ mean≤ oµ ß simplσá subroutinσ ì call«á Al∞á othe≥ subroutine≤ withiε tha⌠ particula≥ modulσá arσ ì als∩ loaded¼á bu⌠ the∙ arσ no⌠ availablσ t∩ thσ programme≥ unles≤ ì hσá ha≤ als∩ referenceΣ theφ b∙ EX╘ statements«á Thσá modulσá i≤ ì loadeΣá onl∙á once¼á regardles≤ oµ ho≈ man∙ routine≤á withiεá thσ ì modulσá arσ referenced«á Fo≥ thi≤ reason¼á ╔ havσ designeΣá eacΦ ì modulσá t∩ contaiε routine≤ whicΦ arσ frequentl∙ useΣ togethe≥ o≥ ì arσá calleΣá b∙ eacΦ othe≥ (onσ routinσ withiε thσá modulσá call≤ ì another routine within the module). è 1.02 What is Needed to Use SYSLIB? Yo⌡á neeΣ aε 8080- o≥ Z80-baseΣ microcompute≥ witΦ a⌠á leas⌠ ì 48╦á byte≤ oµ contiguou≤ memor∙ runninτ CP/═ 2.2¼á thσá Microsof⌠ ì M8░á assemble≥ too∞ se⌠ (specifically¼á thσ M8░ assemble≥ anΣ thσ ì L8░ linker)¼á anΣ thσ usua∞ se⌠ oµ softwarσ developmen⌠ tool≤ (aε ì edito≥ and¼ preferably¼ ß debugger⌐ t∩ usσ SYSLIB. 1.03 What Does SYSLIB Buy Me? Thσ bottoφ linσ i≤ that¼á t∩ thσ experienceΣ SYSLI┬ programì mer¼á SYSLI┬ ha≤ thσ potentia∞ oµ beinτ ß significan⌠ too∞á whicΦ ì enable≤ hiφ to: 1. Solve his programming task quickly -- becausσá hσ spend≤ les≤ timσ writinτá comì áááámonly-useΣ subroutine≤ anΣ worryinτ abou⌠ ho≈ hi≤ regisì ááááter≤á arσá affecteΣ b∙ thesσ subroutine≤ anΣá morσá timσ ì ááááconcentratinτ oε thσ probleφ a⌠ hand áááá 2. Write space- and speed-efficient code áááá -- becausσá al∞á oµ thσ SYSLI┬ routine≤á havσ ì áááábeeε gonσ ove≥ timσ anΣ timσ agaiε t∩ reducσ thei≥á sizσ ì ááááanΣá makσá theφ morσ efficien⌠ iε term≤á oµá speed╗á fo≥ ì ááááexample¼á thσá SOR╘ routinσ i≤ ß Shel∞ Sor⌠ tha⌠ caεá bσ ì áááácalleΣ t∩ perforφ thσ sor⌠ usinτ pointer≤ (iε whicΦ casσ ì áááái⌠á exchange≤ pointer≤ rathe≥ thaε record≤ wheε i⌠ need≤ ì áááát∩ d∩ ß swap⌐ o≥ perforφ thσ sor⌠ withou⌠ usinτ pointer≤ ì áááá(wheε spacσ i≤ ß facto≥ anΣ therσ ma∙ no⌠ bσ enougΦ rooφ ì ááááfo≥ ß pointe≥ table) áááá 3« Writσ morσ maintainablσ code áááá -- becausσ SYSLI┬ i≤ designeΣ witΦ structureΣ ì ááááprogramminτ philosoph∙ iε mind╗ eacΦ subroutinσ i≤ equiì áááávalen⌠á t∩ ß proces≤ box¼á havinτ (1⌐ onl∙ onσá entrancσ ì ááááanΣ onσ exit¼á (2⌐ ß precisely-defineΣ function¼ anΣ (3⌐ ì ááááß precisely-defineΣ se⌠ oµ inpu⌠ anΣ outpu⌠á parameters╗ ì ááááhavinτá useΣá SYSLI┬ fo≥ somσ timσ now¼á thσ autho≥á ha≤ ì áááánoteΣ tha⌠ hi≤ programminτ though⌠ processe≤ anΣ prograφ ì áááádesign≤á havσ tendeΣ morσ anΣ morσ towarΣá end-inôá (top-ì áááádowε froφ thσ objectivσ poin⌠ oµ vie≈ anΣ bottom-u≡ froφ ì ááááthσ SYSLI┬ subroutinσ poin⌠ oµ view)¼ structureΣ design≤ ì áááátha⌠á hσá caεá g∩ bacδ t∩ a⌠ ß late≥á datσá anΣá readil∙ ì áááádeciphe≥ anΣ modify áááá 4. Reduce the programming effort áááá -- becausσá SYSLI┬ provide≤ ß numbe≥ oµá ver∙ ì ááááinvolveΣ routine≤ whicΦ would¼ iε themselves¼ takσ quitσ ì áááásomσá timσ t∩ code╗á fo≥ example¼á thσ DIR╞ routinσ wil∞ ì ááááloaΣ thσ director∙ oµ ß disδ int∩ memory¼á selec⌠ ßá se⌠ ì ááááoµá file≤á froφ tha⌠ loadeΣ director∙ a≤ specifieΣ b∙á ß ì ááááFilσ Contro∞ Blocδ anΣ ß flaτ whicΦ indicate≤ whethe≥ t∩ ì ááááincludσ Systeφ o≥ Non-Systeφ file≤ anΣ wha⌠ use≥ areß i≤ ì áááát∩á bσ examined¼á pack≤ thσ loadeΣá director∙á (removinτ ì ááááentrie≤ no⌠ selecteΣ froφ thσ memor∙ buffer)¼á alphabetì ááááize≤á thσ director∙ entrie≤ b∙ filσ namσ anΣ typσ o≥á b∙ ì ááááfilσá typσ anΣ name¼á anΣ return≤ ß pointe≥ t∩ thσ firs⌠ ì ááááentr∙ anΣ ß coun⌠ oµ thσ numbe≥ oµ entrie≤ selected Iε man∙ ways¼á SYSLI┬ bring≤ somσ oµ thσ advantage≤ oµá proì gramminτá iεá ß High-Orde≥ Language¼á likσ ├ o≥á Pascal¼á t∩á thσ ì assembl∙á languagσá programmer«á I⌠á allow≤ hiφ t∩á maintaiεá thσ ì smalle≥ codσ sizσ anΣ greate≥ efficienc∙ whicΦ caε bσ realizeΣ iε ì assembl∙á languagσ programminτ anΣ simultaneousl∙ realizσá ßá reì duceΣá life-cyclσá cos⌠á (froφ developmen⌠ t∩ fieldinτá t∩á post-ì fieldinτá maintenancσá anΣ modification⌐ ove≥á assembl∙á languagσ ì programminτ withou⌠ ß SYSLIB-likσ too∞ set. 1.04 How Do I Assemble with SYSLIB? EacΦá examplσ iε Sectioε 2▒ oµ thi≤ manua∞ show≤ aε assembl∙ ì oµ thσ samplσ program«á ╔ frequentl∙ usσ ß commanΣ file¼ whicΦ ╔ ì cal∞ M80.SUB¼á t∩ assemblσ m∙ programs«á Thi≤ commanΣ filσ take≤ ì onl∙ onσ parameter¼á thσ namσ oµ thσ filσ t∩ bσ assembleΣ WITHOU╘ ì its type (MAC is assumed). Warning: The command MUST be: SUB M80 filename and it MUST NOT be: SUB M80 filename.typ Iµá i⌠á i≤ oµ thσ latte≥ form¼á thσ sourcσ codσ wil∞á bσá deleteΣ ì durinτ thσ assembl∙ processí Yo⌡ ma∙ wisΦ t∩ removσ the ER┴ $1.BAK commanΣ iε thσ M80.SU┬ filσ t∩ eliminatσ thi≤ problem« ╔ onl∙ d∩ ì this for a space savings. My M80.SUB command file is: ; M80.SUB -- MACRO-80 Assembler and Linker M80 =$1 SUB /A PLEASE ABORT IF ERROR(S) EXIST ERA $1.BAK ERA $1.COM L80 /P:100,$1,A:SYSLIB/S,$1/N,/U,/E ERA $1.REL ; ASSEMBLY COMPLETE ╔ ruε ZCPR▓ insteaΣ oµ thσ CP/═ 2.▓ CCP¼á anΣ ╔ aφ alway≤ oε ì Drivσá B║á doinτá m∙á developmen⌠á work¼á whilσá m∙á editor≤á anΣ ì assembler≤ (anΣ SYSLIB.REL⌐ arσ oε Drivσ A:«á Notσ tha⌠ thi≤á i≤ ì reflected in M80.SUB, where L80 looks for A:SYSLIB for the scan. 1.05 How Do I Learn to Use SYSLIB Effectively? Thi≤ is¼ oµ course¼ opinion¼ bu⌠ ╔ fee∞ tha⌠ thσ bes⌠ wa∙ t∩ ì learn how to use SYSLIB would involve the following steps: 1«á Stud∙á thσá SYSLI┬ manua∞ iε aε overvie≈á fashion¼ ì familiarizinτá yourselµá witΦ thσ function≤á oµá thσá subroutine≤ ì available 2«á Stud∙ iε somσ detai∞ thσ samplσ sourcσ program≤ iε ì Sectioε 21¼ jumpinτ bacδ t∩ thσ maiε bod∙ oµ thσ manua∞ froφ timσ ì t∩á timσ t∩ seσ wh∙ thσ routine≤ ╔ selecteΣ iε thσ program≤á werσ ì used in the way I used them 3« Tr∙ codinτ ß couplσ oµ thσ routine≤ iε thi≤ manual¼ ì copying them verbatim and assembling them 4« Tr∙ makinτ u≡ ß fe≈ simplσ problem≤ oµ you≥ owε anΣ ì use SYSLIB to code them 5«á Appl∙á SYSLI┬ t∩ ß significan⌠ prograφ yo⌡ wan⌠ t∩ ì write ╔ aφ ß stronτ advocatσ oµ writinτ program≤ iε orde≥ t∩ learε ì ho≈ t∩ program¼á anΣ ╔ fee∞ tha⌠ i⌠ i≤ mos⌠ importan⌠ t∩ (1⌐ gaiε ì a≤á mucΦ familiarit∙ witΦ thσ SYSLI┬ routine≤ a≤ yo⌡ caε anΣá (2⌐ ì t∩ writσ program≤ usinτ thesσ routines. 1.06 Who May Use SYSLIB? SYSLI┬ i≤ hereb∙ releaseΣ t∩ thσ publiπ domain«á Anyonσ wh∩ ì wishe≤ t∩ US┼ i⌠ ma∙ d∩ s∩ witΦ n∩ string≤ attached«á Thσ autho≥ ì assume≤ n∩ responsibilit∙ o≥ liabilit∙ fo≥ thσ usσ oµ SYSLIB« I⌠ ì i≤ copyrighteΣ b∙ thσ author¼á RicharΣ Conn¼á wh∩ ha≤ solσ right≤ ì t∩á it«á SYSLI┬ anΣ it≤ associateΣ documentatioε ma∙ bσ solΣá b∙ ì itselµá o≥á a≤ aε independen⌠ par⌠ oµ ß packagσ oµ program≤á onl∙ ì witΦá thσ express¼á writteε consen⌠ oµ thσ author«á Thσá author¼ ì however¼ support≤ thσ usσ oµ SYSLI┬ b∙ commercia∞ softwarσ develì opers¼á anΣá place≤ n∩ restrictioε oε thσ salσ oµ program≤á whicΦ ì arσá BASE─ oε SYSLI┬ anΣ usσ routine≤ containeΣ withiε SYSLI┬á t∩ ì perforφ thei≥ majo≥ functions. ╔á hopσ yo⌡ enjo∙ usinτ SYSLI┬ anΣ finΣ i⌠ t∩ bσ a≤ usefu∞ ß ì tool as I do. Richard Conn .fo 2 - Directory Manipulation Routines Page # 2.0 SYSLIB Directory Manipulation Routines 2.01 Introduction Thi≤ se⌠ oµ SYSLI┬ routine≤ concern≤ itselµ witΦ thσ loadinτ ì oµ anΣ acces≤ oµ ß disδ director∙ fo≥ thσ genera∞ purpose≤ oµ thσ ì user. Included in this set of routines are the functions of: 1. Preallocation of buffer space for the routines 2. Two routines which load all undeleted directory entries into a buffer, constantly checking for memory overflow as they go DIRLOAD loads the first entry for each file (this is the faster of the two) DIRSLOAD loads the last entry for each file (this routine is required if the user wishes to compute file sizes) 3. A routine to determine the amount of free space on the disk 4. A routine to compute the size of a file in K 5. A routine to sort a loaded directory by file name and type or by file type and name 6. A routine to select (by marking) a set of directory entries which match a given ambiguous file spec 7. A routine to pack the loaded directory, leaving in it only those entries marked by the select routine 2.02 Generalized Routines -- DIRF and DIRFS Routine Name: DIRF and DIRFS Function║ Thi≤ routinσ initialize≤ thσ buffe≥ area¼á load≤ ß disδ ì directory¼á select≤á ßá se⌠á oµ file≤ froφ thσá loadeΣá director∙ ì specifieΣá b∙á thσ user'≤ ambiguou≤ filσ namσ anΣ ßá passeΣá flaτ ì (whicΦ indicate≤ iµ Systeφ file≤ arσ selected¼á Non-systeφá file≤ ì arσá selected¼á al∞á use≥á area≤á arσ t∩á bσá covered¼á anΣá wha⌠ ì particula≥á use≥ areß i≤ t∩ bσ covereΣ iµ al∞ use≥ area≤ arσá no⌠ ì selected)¼ pack≤ thσ directory¼ anΣ alphabetize≤ thσ director∙ b∙ ì filσ namσ anΣ filσ type. Iµá DIR╞ i≤ used¼á thσ processinτ proceed≤ faste≥ sincσ onl∙ ì thσá firs⌠ entr∙ oµ eacΦ filσ i≤ loadeΣ int∩ thσá memor∙á buffer« ì Filσ sizinτ informatioε i≤ no⌠ includeΣ iε thi≤ load¼ however. Iµ DIRF╙ i≤ used¼ thσ processinτ i≤ somewha⌠ slower¼ bu⌠ thσ ì las⌠á entr∙ fo≥ eacΦ filσ i≤ loadeΣ rathe≥ thaε thσ first«á Filσ ì sizinτá informatioεá i≤á containeΣá iεá thi≤á entry¼áá anΣáá thi≤ ì informatioε caε bσ useΣ b∙ thσ FSIZ┼ routine. Inputs: HL points to a dynamic buffer which extends from after the user's code and buffer areas to the end of the TPA DE points to the first byte of the FCB used to specify the ambiguous file name; only the chars in the FN and FT fields are significant, so this need not be a true FCB and may be as short as 12 bytes A is the selection flag, structured as follows: Bit 7 - If Set, Select Non-System Files Bit 6 - If Set, Select System Files Bit 5 - If Set, Select All User Areas Bits 4-0 - If Bit 5 is Cleared, contains number of User Area to Select Outputs: HL points to the first file entry in the buffer; each file entry is 16 bytes long BC contains the number of files selected ááááá A contains an error flag; A=0 and Zero Flag Set ááááá (Z) indicates TPA overflow error during load of ááááá directory entries; A<>0 and NZ indicates load OK Registers Affected: HL, BC, PSW SYSLIB Routines Called: DBUFFER, DIRLOAD, DIRSEL, DIRPACK, DIRALPHA Special Error Conditions: As outline for the A register ááááá above. 2.03 Buffer Allocation Routine -- DBUFFER Routine Name: DBUFFER Function: Thi≤á routinσ allocate≤ thσ buffe≥ spacσ necessar∙á fo≥ ì thσá se⌠ oµ director∙ function≤ iε general«á Iεá particular¼á i⌠ ì allocate≤ thσ necessar∙ spacσ fo≥ thσ alphabetizatioε functioε a≤ ì wel∞ a≤ thσ loadeΣ director∙ itself«á Thi≤ routinσ mus⌠ bσá useΣ ì iµá thσá DIRALPH┴á routinσá i≤á t∩ bσá late≥á useΣá t∩á sor⌠á thσ ì directory╗á thi≤á routinσá allocate≤ al∞ thσ spacσá necessar∙á b∙ ì DIRALPH┴ t∩ sor⌠ thσ routinσ (pointe≥ space)« Iµ thi≤ routinσ i≤ ì called¼ i⌠ i≤ no⌠ necessar∙ t∩ cal∞ thσ DPARAM╙ routine. Inputs: HL points to the beginning address of a dynamic ááááá buffer area which extends to under the CCP Outputs: HL points to the first byte at which the directory ááááá entries are to be loaded ááááá A=0 and Zero Flag is Set (Z) if the CCP is ááááá already overrun; else, A<>0 and NZ Registers Affected: HL, PSW SYSLIB Routines Called: DPARAMS Special Error Conditions: As indicated by A reg and Z flag 2.04 Disk Parameter Information Extraction Routine -- DPARAMS Routine Name: DPARAMS Function: Thi≤á routinσá extract≤ necessar∙ informatioε froφ thσá Disδ ì Paramete≥á Blocδ (DPB⌐ anΣ store≤ i⌠ awa∙ iε somσ globa∞á buffer≤ ì useΣ b∙ othe≥ Disδ Director∙ Routines« Thσ informatioε extracteΣ ì i≤ no⌠ oµ genera∞ concerε b∙ thσ programmer«á AL╠ TH┼ PROGRAMME╥ ì NEED╙á T╧ KNO╫ I╙ THA╘ THI╙ ROUTIN┼ MUS╘ B┼ CALLE─ A╘ LEAS╘á ONC┼ ì BEFOR┼ TH┼ DIRLOA─ O╥ DIRSLOA─ ROUTIN┼ I╙ CALLED« Iµ thσ DBUFFE╥ ì routinσá i≤á called¼á theε i⌠ i≤ no⌠ necessar∙á t∩á cal∞á DPARAM╙ ì again. Fo≥ thσ informatioε oµ thσ reader¼ thσ followinτ informatioε ì i≤ extracted: ááááá BLKSHF <-- Block Shift Factor (1 Byte) ááááá BLKMSK <-- Block Mask (1 Byte) ááááá EXTENT <-- Extent Mask (1 Byte) ááááá BLKMAX <-- Max Number of Blocks on Disk (2 Bytes) ááááá DIRMA╪ <-- Ma° Numbe≥ oµ Di≥ Entrie≤ (▓ Bytes) Thi≤á routinσ automaticall∙ adjust≤ fo≥ version≤ 1.┤ anΣ 2.▓ ì oµ CP/═ anΣ i≤ compatablσ witΦ botΦ version≤ oµ CP/M. Inputs: None Outputs: None (Information Extracted into Buffers) Registers Affected: None SYSLIB Routines Called: None Special Error Conditions: None 2.05 Free Space Computation Routine -- DFREE Routine Name: DFREE Function: Thi≤á routinσá compute≤ thσ amoun⌠ oµ freσ spacσ (iεá ╦ ì bytes⌐ lef⌠ oε disk. Inputs: None Outputs: DE = Amount of Free Disk Space in K Bytes Registers Affected: DE SYSLIB Routines Called: DPARAMS Special Error Conditions: None 2.06 File Size Computation Routine -- FSIZE Routine Name: FSIZE Function: Thi≤á routinσá compute≤ thσ sizσ oµ ß filσ whosσá entr∙ ì (whicΦá MUS╘ bσ loadeΣ b∙ DIRSLOAD⌐ i≤ pointeΣ t∩á b∙á HL«á Thi≤ ì routinσ wil∞ work¼ bu⌠ generall∙ returε incorrec⌠ results¼ iµ thσ ì entr∙ pointeΣ t∩ wa≤ loadeΣ b∙ DIRLOA─ instead. Inputs: HL points to first byte of file entry Outputs: DE contains the file size in K Bytes Registers Affected: DE SYSLIB Routines Called: DPARAMS Special Error Conditions: None 2.07 Directory Load Routines -- DIRLOAD and DIRSLOAD Routine Names: DIRLOAD and DIRSLOAD Function: DIRLOA─á anΣá DIRSLOA─ loaΣ entrie≤ fo≥á al∞á undeleteΣ ì file≤á oεá thσá currentl∙ loggeΣ iε disδ int∩ thσá memor∙á buffe≥ ì pointeΣ t∩ b∙ HL« Al∞ entrie≤ arσ 1╢ byte≤ long. DIRLOA─á i≤ faste≥ thaε DIRSLOAD«á I⌠ load≤ jus⌠ thσá firs⌠ ì entr∙ oµ eacΦ filσ oε disk«á DIRLOAD¼á however¼á shoulΣ bσá useΣ ì onl∙áá iµá filσá sizinτá informatioεá i≤á no⌠á requireΣá b∙áá thσ ì application≤ program. DIRSLOA─á load≤á jus⌠ thσ LAS╘ entr∙ oµ eacΦ filσá oεá disk« ì Thi≤á entr∙ contain≤ thσ necessar∙ filσ sizinτ informatioεá whicΦ ì ma∙ bσ useΣ b∙ FSIZ┼ t∩ computσ thσ sizσ oµ thσ loadeΣ file. Iµá thσá TP┴ i≤ filleΣ durinτ DIRLOA─ o≥ DIRSLOA─ anΣá therσ ì arσ stil∞ morσ filσ entrie≤ t∩ load¼á thσ loaΣ wil∞ bσ halteΣ anΣ ì aε erro≥ returε wil∞ bσ madσ t∩ thσ caller«á Oε return¼á iµá A=░ ì anΣá thσá Zer∩á Flaτá i≤ Se⌠ (Z)¼á theε ßá loaΣá erro≥á occurred╗ ì otherwise¼ thσ loaΣ wa≤ OK. Inputs: HL points to the first byte of the directory buffer ááááá area; this area extends from after the last buffer ááááá used by the applications program to the page ááááá before the CCP. If alphabetization is to be done, ááááá the value returned in HL by DBUFFER is a correct ááááá input for DIRLOAD or DIRSLOAD ááááá A=0 and Zero Flag is Set (Z) if TPA Overflow; ááááá A<>0 and NZ if load OK Outputs: BC is the number of files loaded into the buffer Registers Affected: BC SYSLIB Routines Called: None Special Error Conditions: If TPA is filled and load is ááááá incomplete, A=0 and Zero Flag is Set (Z) as error indic 2.08 Directory Alphabetization Routine -- DIRALPHA Routine Name: DIRALPHA Function: T∩ alphabetizσ thσ file≤ iε thσ director∙ pointeΣ t∩ b∙ ì H╠á b∙ eithe≥ filσ namσ anΣ typσ (STEST.AS═ goe≤ beforσ TEST.AAA⌐ ì o≥ b∙ filσ typσ anΣ namσ (TEST.AA┴ goe≤ beforσ STEST.ASM). Inputs: HL points to first directory entry ááááá BC contains the number of files to sort ááááá ┴ i≤ thσ sor⌠ flag╗ A=░ mean≤ sor⌠ b∙ filσ namσ anΣ ì ááááá áááááthen file type, A<>0 means by file type and name Outputs: None (directory list is sorted) Registers Affected: PSW SYSLIB Routines Called: PRINT Special Error Conditions: ááááá I⌠á i≤ possible¼á alth∩ highl∙ unlikel∙ froφ al∞á test≤ ì ááááágiveεá s∩á far¼á tha⌠á DIRALPH┴ ma∙ experiencσá aεá interna∞ ì áááááerror. If this happens, the message: ááááá DIRALPHA -- Pointer Error áááááwil∞ bσ printeΣ anΣ thσ routinσ wil∞ abor⌠ t∩ CP/M« Iµ thi≤ ì áááááhappens¼á pleasσá repor⌠á thi≤ probleφ anΣá bσá prepareΣá t∩ ì áááááduplicatσ thσ exac⌠ situatioε whicΦ causeΣ thi≤ erro≥ t∩ thσ ì áááááauthor, Richard Conn. 2.09 Directory Entry Selection Routine -- DIRSEL Routine Name: DIRSEL Function: DIRSE╠á select≤á al∞á entrie≤ iε thσá director∙á buffe≥ ì whicΦá matcΦ thσ ambiguou≤ filσ namσ specifieΣ iε thσ F╬á anΣá F╘ ì field≤á oµá thσá FC┬ pointeΣ t∩ b∙ D┼ upoε entr∙á t∩á DIRSEL«á ┴ ì selectioεá flaτ i≤ als∩ passeΣ t∩ DIRSE╠ iε thσ ┴á register¼á anΣ ì thi≤ flaτ tell≤ DIRSE╠ whethe≥ o≥ no⌠ t∩ includσ Non-Systeφ file≤ ì anΣ Systeφ file≤ iε thσ selectioε anΣ whethe≥ t∩ selec⌠ file≤á iε ì al∞ use≥ area≤ o≥ iε ß particula≥ use≥ area. DIRSE╠á identifie≤ thσ selecteΣ filσ entrie≤ b∙ settinτá thσ ì Mos⌠á Significan⌠ Bi⌠ oµ thσ firs⌠ bytσ oµ eacΦ oµ thesσá entrie≤ ì t∩ ▒ iµ thσ entr∙ i≤ selected«á DIRSE╠ make≤ n∩ othe≥ change≤ t∩ ì thσ filσ entrie≤ iε thσ director∙ buffer. Inputs: HL points to the directory buffer ááááá D┼á point≤ t∩ thσ FC┬ containinτ thσá ambiguou≤á F╬ ì ááááá and FT fields; only the first 12 bytes are needed ááááá BC contains the number of files in the directory ááááá A contains a selection flag, organized as follows: ááááá Bit 7 - Select Non-System Files ááááá Bit 6 - Select System Files ááááá Bit 5 - Select Files in All User Areas ááááá Bits 4-0 - If Bit 5 is 0, indicates number of ááááá User Area to select files from Outputs: None (MSBs of selected entries are set) Registers Affected: None SYSLIB Routines Called: None Special Error Conditions: None 2.10 Directory Pack Routine -- DIRPACK Routine Name: DIRPACK Function: DIRPAC╦á restructure≤ thσ director∙ buffe≥á t∩á contaiε ì onl∙ thosσ entrie≤ markeΣ b∙ DIRSEL«á Iε thi≤ way¼ thosσ entrie≤ ì NO╘á markeΣá b∙ DIRSE╠ arσ discardeΣ froφ thσá buffe≥á (actually¼ ì jus⌠á takeε ou⌠ oµ consideration¼á bu⌠ thσ content≤ oµ thσ buffe≥ ì afte≥á thσá las⌠á selecteΣ entr∙ i≤á no⌠á guaranteeΣá t∩á contaiε ì anythinτ significant). Thσá Mos⌠á Significan⌠ Bi⌠ oµ thσ firs⌠ bytσ oµ al∞á entrie≤ ì remaininτ iε thσ director∙ buffe≥ i≤ rese⌠ t∩ ░ a≤ ß sidσá effec⌠ ì oµ DIRPACK. Inputs: HL points to the directory buffer ááááá BC contains the number of files in the buffer Outputs: BC contains the number of files (those selected by ááááá DIRSEL) remaining in the directory buffer Registers Affected: BC SYSLIB Routines Called: None Special Error Conditions: None 2.11 Negative Directory Pack Routine Routine Name: DIRNPACK Function: DIRNPAC╦á restructure≤ thσ director∙ buffe≥ t∩á contaiε ì onl∙á thosσá entrie≤ NO╘ markeΣ b∙ DIRSEL«á Iε thi≤á way¼á thosσ ì entrie≤ markeΣ b∙ DIRSE╠ arσ discardeΣ froφ thσ buffe≥ (actually¼ ì jus⌠ takeε ou⌠ oµ consideration¼á bu⌠ thσ content≤ oµ thσá buffe≥ ì afte≥á thσá las⌠á selecteΣá entr∙ i≤ no⌠á guaranteeΣá t∩á contaiε ì anythinτ significant). Thσá Mos⌠ Significan⌠ Bi⌠ oµ thσ firs⌠ bytσ oµá al∞á entrie≤ ì remaininτá iε thσ director∙ buffe≥ i≤ rese⌠ t∩ ░ a≤ ß sidσ effec⌠ ì oµ DIRNPACK. Inputs: HL points to the directory buffer ááááá BC contains the number of files in the buffer Outputs: BC contains the number of files (those NOT selected ááááá by DIRSEL) remaining in the directory buffer Registers Affected: BC SYSLIB Routines Called: DIRPACK Special Error Conditions: None .fo 3 - Numeric String Evaluation Routines Page # 3.0 Numeric String Evaluation Routines 3.01 Evaluation of String at All Bases -- EVAL Routine Name: EVAL Function║ Thi≤á routinσ convert≤ thσ characte≥ strinτ pointeΣá t∩ ì b∙á H╠á int∩ thσ 16-bi⌠ binar∙ numbe≥ representeΣá b∙á it«á EVA╠ ì perform≤á thσá conversioεá unti∞ ß non-hexadecima∞á characte≥á i≤ ì encountered¼ a⌠ whicΦ timσ i⌠ look≤ a⌠ thσ las⌠ characte≥ anΣ thσ ì previou≤á characte≥ t∩ determinσ iµ thσ strinτ i≤ representinτá ß ì binary¼á octal¼á decimal¼á o≥ hexadecima∞ number«á Inpu⌠á strinτ ì character≤á ma∙ bσ upper- o≥ lower-case«á ValiΣ format≤ fo≥á thσ ì inpu⌠ strinτ arσ -- bbbbbbbbbbbbbbbbB -- b=0 or b=1; Binary string ttttt or tttttD -- 0 <= t <= 9; Decimal string hhhhH or hhhhX -- 0 <= h <= F; Hexadecimal string oooooooO or oooooooQ -- 0 <= o <= 7; Octal string Inputs: HL points to the first byte of the string to convert String is loaded in a buffer Outputs: HL points to next character after converted string DE contains 16-bit value A = E CARR┘á Flaτ Se⌠ mean≤ aε erro≥ wa≤ encountereΣá iε ì strinτ format Registers Affected: PSW, DE, HL SYSLIB Routines Called: CAPS, EVAL16, EVAL10, EVAL8, EVAL2 Specia∞á Erro≥ Conditions║ CARR┘á Flaτ Se⌠ indicate≤ tha⌠ aε erro≥ wa≤ encountereΣ ì iεá thσá evaluatioεá oµ thσ string╗á iµá so¼á H╠á point≤á t∩á thσ ì offendinτ character 3.02 Evaluation of String in Base 16 -- EVAL16 Routine Name: EVAL16 Function║ EVAL1╢áá convert≤á thσá strinτá oµá ASCI╔áá hexadecima∞ ì character≤áá pointeΣá t∩á b∙á H╠á int∩á ßá 16-bi⌠á binar∙á value« ì Conversioε progresse≤ unti∞ aε invaliΣ hexadecima∞ digi⌠ (0-9¼ A-ì F⌐ i≤ encountered. Inputs: HL points to the first byte of the string to convert String is loaded in a buffer Outputs: HL points to the offending character DE contains the 16-bit value A = E Registers Affected: PSW, DE, HL SYSLIB Routines Called: CAPS Special Error Conditions: -None- 3.03 Evaluation of String in Base 10 -- EVAL10 Routine Name: EVAL10 Function║ EVAL1░ convert≤ thσ strinτ oµ ASCI╔ decima∞á character≤ ì pointeΣá t∩á b∙á H╠á int∩á ßá 16-bi⌠á binar∙á value«á Conversioε ì progresse≤ unti∞ aε invaliΣ decima∞ digi⌠ (0-9⌐ i≤ encountered. Inputs: HL points to the first byte of the string to convert String is loaded in a buffer Outputs: HL points to the offending character DE contains the 16-bit value A = E Registers Affected: PSW, DE, HL SYSLIB Routines Called: -None- Special Error Conditions: -None- 3.04 Evaluation of String in Base 8 -- EVAL8 Routine Name: EVAL8 Function║ EVAL╕á convert≤á thσ strinτ oµ ASCI╔á octa∞á character≤ ì pointeΣá t∩á b∙á H╠á int∩á ßá 16-bi⌠á binar∙á value«á Conversioε ì progresse≤ unti∞ aε invaliΣ octa∞ digi⌠ (0-7⌐ i≤ encountered. Inputs: HL points to the first byte of the string to convert String is loaded in a buffer Outputs: HL points to the offending character DE contains the 16-bit value A = E Registers Affected: PSW, DE, HL SYSLIB Routines Called: -None- Special Error Conditions: -None- 3.05 Evaluation of String in Base 2 -- EVAL2 Routine Name: EVAL2 Function║ EVAL▓á convert≤á thσ strinτ oµ ASCI╔ binar∙á character≤ ì pointeΣá t∩á b∙á H╠á int∩á ßá 16-bi⌠á binar∙á value«á Conversioε ì progresse≤ unti∞ aε invaliΣ binar∙ digi⌠ (0-1⌐ i≤ encountered. Inputs: HL points to the first byte of the string to convert String is loaded in a buffer Outputs: HL points to the offending character DE contains the 16-bit value A = E Registers Affected: PSW, DE, HL SYSLIB Routines Called: -None- Special Error Conditions: -None- .fo 4 - Byte-Oriented File Input/Output Routines Page # 4.0 Byte-Oriented File Input/Output Routines 4.01 Introduction to Byte-Oriented File Input/Output Routines Thσá followinτá documentatioεá cover≤ thσá serie≤á oµá byte-ì orienteΣá filσ input/outpu⌠ routine≤ iε SYSLIB«á Thesσá routine≤ ì allo≈ thσ use≥ t∩ sequentiall∙ reaΣ froφ (GET⌐ anΣ writσ t∩ (PUT⌐ ì ß filσ oε ß byte-for-bytσ basis«á Hence¼á thesσ routine≤ providσ ì aε exceptionall∙ simplσ methoΣ fo≥ handlinτ inpu⌠ froφ anΣ outpu⌠ ì t∩ ß file. ┴ typica∞ prograφ whicΦ employ≤ thesσ routine≤ mus⌠ opeε thσ ì requireΣ file≤ beforσ doinτ an∙ processing¼ mus⌠ theε perforφ thσ ì processinτá oε thσ openeΣ files¼á anΣ mus⌠ theε closσá thσá file≤ ì wheεá thσá processinτ i≤ completσ (closinτ thσ file≤ i≤á optiona∞ ì fo≥ inpu⌠ file≤ anΣ mandator∙ fo≥ outpu⌠ files). SYSLI┬ provide≤ fou≥ set≤ oµ routine≤ fo≥ byte-orienteΣ filσ ì inpu⌠ anΣ output« Thesσ routine≤ arσ -- Input Open Output Open GET PUT Input Close Output Close ---------- ----------- --- --¡ ----------- ------------ FI0$OPEN FO0$OPEN F0$GET F0$PUT FI0$CLOSE FO0$CLOSE FI1$OPEN FO1$OPEN F1$GET F1$PUT FI1$CLOSE FO1$CLOSE FI2$OPEN FO2$OPEN F2$GET F2$PUT FI2$CLOSE FO2$CLOSE FI3$OPEN FO3$OPEN F3$GET F3$PUT FI3$CLOSE FO3$CLOSE Thi≤á systeφá allow≤á thσ use≥ t∩ havσ u≡ t∩á ╕á file≤á opeε ì simultaneousl∙ -- fou≥ arσ opeε fo≥ inpu⌠ usinτ GE╘ anΣ fou≥á arσ ì opeεá fo≥á outpu⌠ usinτ PUT«á Fo≥ example¼á thσ followinτá i≤á ß ì samplσ codσ sectioε usinτ thesσ routine≤ fo≥ tw∩ files: EXT FI0$OPEN ; DECLARE LIBRARY REFERENCES EXT FO0$OPEN EXT FI0$CLOSE EXT FO0$CLOSE EXT F0$GET EXT F0$PUT ... LXI D,FCBI ; PT TO FCB OF INPUT FILE CALL FI0$OPEN LXI D,FCBO ; PT TO FCB OF OUTPUT FILE CALL FO0$OPEN ... [body containing CALL F0$GET and CALL F0$PUT where required] ... CALL FI0$CLOSE ; CLOSE FILE CALL FO0$CLOSE ... END Notσ tha⌠ onl∙ thσ routine≤ t∩ bσ useΣ arσ referenceΣ iε thσ ì EX╘ statements«á Iµ yo⌡ d∩ no⌠ neeΣ ß particula≥ routine¼ d∩ no⌠ ì referencσá it«á No⌠á referencinτ aε unneedeΣá routinσá generall∙ ì save≤ thσ overheaΣ memor∙ spacσ oµ loadinτ i⌠ froφ thσ library. EacΦ se⌠ oµ INPU╘ OPEN¼á INPU╘ CLOSE¼á OUTPU╘á OPEN¼á OUTPU╘ ì CLOSE¼á GET¼ anΣ PU╘ routine≤ i≤ containeΣ iε onσ librar∙ module¼ ì s∩á referencinτ an∙ oµ thesσ routine≤ cause≤ thσ entirσ modulσ t∩ ì bσá loaded¼á anΣá al∞á thσ routine≤ arσ accessablσá t∩á thσá use≥ ì (provideΣ the∙ arσ mentioneΣ iε thσ externa∞ definitions⌐ withou⌠ ì an∙áá additiona∞á memor∙áá overhead«áá Specifically¼áá FI0$OPEN¼ ì FI0$CLOSE¼á FO0$OPEN¼ FO0$CLOSE¼ F0$GET¼ anΣ F0$PU╘ arσ containeΣ ì iε onσ module¼á anΣ referencσ t∩ an∙ oµ thesσ routine≤ load≤á thσ ì entirσ module╗ thσ samσ i≤ truσ fo≥ thσ othe≥ set≤ oµ routines. Thσ CLOS┼ routinσ fo≥ outpu⌠ (FOn$CLOSE⌐ i≤ ALWAY╙ required╗ ì i⌠á fill≤á thσ res⌠ oµ thσ curren⌠ blocδ witΦ Ctrl-┌ followeΣá b∙ ì <NULL╛á byte≤ anΣ properl∙ close≤ file«á Thσ CLOS┼á routinσá fo≥ ì inpu⌠ (FIn$CLOSE⌐ i≤ requireΣ ONL┘ I╞ yo⌡ arσ goinτ t∩ late≥ opeε ì anothe≥á filσá fo≥á inpu⌠ usinτ thσá correspondinτá OPE╬á routinσ ì (FIn$OPEN)«á FIn$CLOS┼á onl∙ serve≤ t∩ rese⌠ thσ OPE╬ flaτ (useΣ ì t∩ GE╘ t∩ ascertaiε tha⌠ thσ filσ ha≤ beeε properl∙ opened). 4.02 Byte-Oriented Input and Output File Open Routine Names: FI0$OPEN, FI1$OPEN, FI2$OPEN, FI3$OPEN Function║ Opeεá thσ filσ whosσ FC┬ i≤ pointeΣ t∩ b∙ D┼ fo≥á inpu⌠ ì (usσ witΦ F$GET). Inputs: DE = ptr to FCB of file to open Outputs: Z Flag is Error Indicator, A is Error Code Registers Affected: PSW SYSLIB Routines Called: Internal Special Error Conditions: See Section on Error Codes Routine Names: FO0$OPEN, FO1$OPEN, FO2$OPEN, FO3$OPEN Function║ Opeε thσ filσ whosσ FC┬ i≤ pointeΣ t∩ b∙ D┼ fo≥á outpu⌠ ì (usσ witΦ F$PUT). Inputs: DE = ptr to FCB of file to open Outputs: Z Flag is Error Indicator, A is Error Code Registers Affected: PSW SYSLIB Routines Called: Internal Special Error Conditions: See Section on Error Codes 4.03 Byte-Oriented Input and Output File Close Routine Names: FI0$CLOSE, FI1$CLOSE, FI2$CLOSE, FI3$CLOSE Function║ Closσá thσ filσ previousl∙ openeΣ b∙ thσá correspondinτ ì FI$OPE╬á routine«á Usσá oµá thesσ routine≤ i≤á optiona∞á iµá thσ ì anothe≥á filσá wil∞á no⌠ bσ openeΣ late≥ iε thσá prograφá b∙á thσ ì correspondinτ FI$OPE╬ routine. Inputs: -None- Outputs: Z Flag is Error Indicator, A is Error Code Registers Affected: PSW SYSLIB Routines Called: Internal Specia∞ Erro≥ Conditions: See Section on Error Codes Routine Names: FO0$CLOSE, FO1$CLOSE, FO2$CLOSE, FO3$CLOSE Function║ Closσá thσ filσ previousl∙ openeΣ b∙ thσá correspondinτ ì FO$OPE╬ routine« Usσ oµ thesσ routine≤ i≤ MANDATOR┘ afte≥ outpu⌠ ì t∩ thσ filσ (usinτ thσ correspondinτ F$PU╘ routine⌐ i≤ complete. Inputs: -None- Outputs: Z Flag is Error Indicator, A is Error Code Registers Affected: -None- SYSLIB Routines Called: Internal Specia∞ Erro≥ Conditions: See Section on Error Codes è 4.04 Byte-Oriented Input and Output Routine Names: F0$GET, F1$GET, F2$GET, F3$GET Function║ Ge⌠ thσ nex⌠ bytσ iε sequencσ froφ thσ filσá previousl∙ ì openeΣ b∙ thσ correspondinτ FI$OPE╬ routine« Bytσ i≤ returneΣ iε ì Registe≥ A. Inputs: -None- Outputs: A = Next byte from file if no error If Error, NZ and A = Error Code Registers Affected: PSW SYSLIB Routines Called: Internal Specia∞ Erro≥ Conditions: See Section on Error Codes Routine Names: F0$PUT, F1$PUT, F2$PUT, F3$PUT Function║ Pu⌠á thσá bytσ iε Registe≥ ┴ ont∩ thσ enΣ oµá thσá filσ ì previousl∙ openeΣ b∙ thσ correspondinτ FO$OPE╬ routine. Inputs: A = Byte to PUT Outputs: Z Flag is Error Indicator, A is Error Code Registers Affected: PSW SYSLIB Routines Called: Internal Specia∞á Erro≥ Conditions║ See Section on Error Codes 4.05 Error Return Codes Fo≥á eacΦ oµ thσ routine≤ iε thi≤ se⌠ oµ byte-orienteΣá filσ ì I/╧ routines¼ thσ Zer∩ Flaτ anΣ thσ ┴ Registe≥ pla∙ ß ke∙ rolσ iε ì indicating the error conditions of the routines. Iµá thσá Zer∩á Flaτá i≤ Se⌠ (Z⌐ afte≥á ßá routinσá ha≤á beeε ì executed¼á theε thi≤ indicate≤ tha⌠ n∩ erro≥ ha≤ occurred« Thσ ┴ ì Registe≥á i≤á eithe≥á unaffecteΣ (iε mos⌠ cases⌐á o≥á contain≤á ß ì returned value (if so indicated, as in Fn$GET routines). Iµá thσá Zer∩ Flaτ i≤ Clea≥ (NZ⌐ afte≥ ßá routinσá ha≤á beeε ì executed¼á theε thi≤ indicate≤ tha⌠ aε erro≥ ha≤ occurred« Thσ ┴ ì Registe≥á no≈á contain≤á thσ Erro≥á Code«á Thσá followinτá tablσ ì summarize≤á thσá Erro≥á Code≤á whicΦ ma∙ bσá returneΣá iεá thσá ┴ ì Register. è The following display summarizes the Error Codes. Summary of Error Codes Returned by Byte-Oriented File I/O Routines Code Meaning ---- ------- 1 GET or PUT attempted on an unopened file 2 Disk Full (Ran out of space) 3 Input File Not Found 4 Attempt to Read Past EOF 5 Directory Full 6 Error in Closing a File 7 Attempt to Open a File which is already Open .fo 5 - CP/M File Input/Output Routines Page # 5.0 CP/M File Input/Output Routines 5.01 Introduction Thσ followinτ routine≤ arσ general-purposσ filσ I/╧ routine≤ ì whicΦá interfacσá t∩ CP/═ througΦ thσ Entr∙ Poin⌠ a⌠ locatioεá 5« ì The∙ preservσ BC¼á DE¼á anΣ HL¼ anΣ the∙ returε witΦ thσ standarΣ ì CP/═ erro≥ code≤ fo≥ thσ correspondinτ routines. Specifically, these routines are -- F$OPEN Open a file F$MOPEN Open/Create a file F$CLOSE Close a file F$MAKE Create a file F$DELETE Delete a file F$RENAME Rename a file F$EXIST Test of existance of a file F$READ Read a block (128 bytes) from a file F$WRITE Write a block (128 bytes) to a file 5.02 Open a File Routine Name: F$OPEN Function║ Opeεá thσá filσ specifieΣ b∙ thσ FC┬ pointeΣ t∩ b∙á DE« ì Iµ filσ no⌠ found¼á F$OPE╬ return≤ witΦ aε erro≥ codσ iε ┴ (0FFH⌐ ì anΣ Zer∩ Flaτ Clea≥ (NZ). Inputs: DE = pointer to FCB Outputs: A = Error Code and PSW Flags Set (Zero Flag) 0 --> No Error 0FFH --> File not opened Registers Affected: PSW SYSLIB Routines Called: BDOS, CAPS, CIN, COUT, CRLF, PRINT Special Error Conditions: -None- Routine Name: F$MOPEN Function║ Opeεá thσ filσ specifieΣ b∙ thσ FC┬ pointeΣ t∩á b∙á DE« ì Iµá filσ i≤ no⌠ found¼á F$MOPE╬ trie≤ t∩ creatσ one«á I⌠ return≤ ì thσá erro≥ codσ oµ 0FF╚ iε ┴ iµ therσ wa≤ no⌠ enougΦ rooφ iεá thσ ì disδ director∙ t∩ creatσ thσ director∙ entry. Inputs: DE = pointer to FCB Outputs: A = Error Code and PSW Flags (Zero Flag) Set 0 --> No Error 0FFH --> File not opened Registers Affected: PSW SYSLIB Routines Called: BDOS, CAPS, CIN, COUT, CRLF, PRINT Special Error Conditions: -None- 5.03 Close a File Routine Name: F$CLOSE Function: Close the file whose FCB is pointed to by DE. Inputs: DE = pointer to FCB Outputs: A = Error Code 0 --> No Error 0FFH --> Error in closing file Registers Affected: PSW SYSLIB Routines Called: BDOS Special Error Conditions: -None- 5.04 Create a File Routine Name: F$MAKE Function: Create (Make) the file whose FCB is pointed to by DE. Inputs: DE = pointer to FCB Outputs: A = Error Code 0FFH --> No directory space available Not 0FFH --> No Error; Value is byte address in TBUFF (80H-0FFH) of directory entry allocated to the FCB Registers Affected: PSW SYSLIB Routines Called: BDOS, F$DELETE Special Error Conditions: -None- 5.05 Delete a File Routine Name: F$DELETE Function║ Deletσ thσ filσ whosσ FC┬ i≤ pointeΣ t∩ b∙ DE« Iµ filσ ì doe≤á no⌠á exist¼á nothinτ happen≤ (n∩ erro≥ messagσ o≥á codσá i≤ ì given). Inputs: DE = pointer to FCB Outputs: -None- Registers Affected: PSW SYSLIB Routines Called: BDOS Special Error Conditions: -None- 5.06 Rename a File Routine Name: F$RENAME Function║ F$RENAM┼á ma∙ bσ useΣ t∩ renamσ ß file«á Oε entry¼á D┼ ì pt≤ t∩ thσ firs⌠ twelvσ byte≤ oµ thσ file'≤ FC┬ anΣ H╠ pt≤ t∩ thσ ì firs⌠ twelvσ byte≤ oµ thσ FC┬ fo≥ thσ ne≈ filσ (tha⌠ is¼ onl∙ thσ ì F╬ anΣ F╘ field≤ arσ significant¼á s∩ thσ res⌠ oµ aε FC┬ neeΣ no⌠ ì bσá presen⌠á fo≥ thi≤ functioε t∩ work)«á F$RENAM┼á contain≤á aε ì interna∞ FC┬ whicΦ i≤ structureΣ froφ thσ tw∩ entrie≤ t∩ properl∙ ì rename the file. Inputs: HL pts to 1st 12 bytes of new FCB DE pts to 1st 12 bytes of old FCB Outputs: Zero Flag Set (Z) means error (file not found) Registers Affected: PSW SYSLIB Routines Called: BDOS, FILLB, MOVEB Specia∞ Erro≥ Conditions║á Filσ No⌠ FounΣ error¼á indicateΣ ì by Z flag 5.07 Test for the Existance of a File Routine Name: F$EXIST Function║ F$EXIS╘ test≤ fo≥ thσ presencσ oµ thσ filσ whosσ FC┬ i≤ ì pteΣá t∩ b∙ D┼ iε thσ curren⌠ disk/use≥ area«á Iµ thi≤ filσ doe≤ ì no⌠á exis⌠ iε thi≤ area¼á F$EXIS╘ return≤ witΦ thσ Zer∩ Flaτá Se⌠ ì (Z); if this file does exist, F$EXIST returns with NZ. Inputs: DE pts to FCB of file to test for Outputs: Zero Flag Set (Z) means file not found; NZ means file found Registers Affected: PSW SYSLIB Routines Called: BDOS Specia∞á Erro≥ Conditions║ None 5.08 Read a Block from a File Routine Name: F$READ Function║ ReaΣá nex⌠ blocδ (12╕ bytes⌐ froφ thσ openeΣ filσ whosσ ì FC┬ i≤ pointeΣ t∩ b∙ D┼ int∩ TBUF╞ (buffe≥ a⌠ 80╚ - 0FFH). Inputs: DE = pointer to FCB Outputs: A = Error Code 0 --> No Error 1 --> Read past end of file 2 --> Reading unwritten data in random access Registers Affected: PSW SYSLIB Routines Called: BDOS Special Error Conditions: -None- 5.09 Write a Block to a File Routine Name: F$WRITE Function║ Writσá nex⌠ blocδ (12╕ bytes⌐ froφ TBUF╞ (buffe≥ a⌠ 80╚ ì t∩ 0FFH⌐ t∩ thσ openeΣ filσ whosσ FC┬ i≤ pointeΣ t∩ b∙ DE. Inputs: DE = pointer to FCB Outputs: A = Error Code 0 --> No Error 1 --> Error in extending file 2 --> End of disk data 0FFH --> No more directory space Registers Affected: PSW SYSLIB Routines Called: BDOS Special Error Conditions: -None- .fo 6 - File Name String Parser and FCB Init Page # 6.0 File Name String Parser and FCB Init Routine Name: FNAME Function: FNAM┼á i≤ ß filσ namσ scanner«á Pointinτ t∩ thσá firs⌠ ì characte≥ oµ ß filσ namσ specificatioε oµ thσ form: ááááá du:filename.typ wherσá an∙á par⌠ oµ thσ specificatioε i≤ optional¼á thi≤á routinσ ì fill≤ iε aε FC┬ witΦ zeroe≤ (3╢ bytes)¼á properl∙ initialize≤ thσ ì F╬ (Filσ Name⌐ fielΣ iµ 'filenameº i≤ presen⌠ anΣ F╘ (Filσá Type⌐ ì fielΣ iµ 'typº i≤ present¼ anΣ return≤ thσ numbe≥ oµ thσ selecteΣ ì disδá (iεá thσ rangσ froφ ▒ fo≥ ┴ t∩ 1╢ fo≥ P⌐ iµ 'dº i≤á presen⌠ ì anΣá thσ numbe≥ oµ thσ selecteΣ use≥ (iε thσ rangσ froφ ░á t∩á 3▒ ì anΣá thσ questioε marδ '?º character⌐ iµ 'uº i≤ present«á Iµ 'dº ì i≤ no⌠ present¼ 0FF╚ i≤ returneΣ fo≥ i⌠ t∩ indicatσ curren⌠ disk¼ ì anΣá iµ 'uº i≤ no⌠ present¼á 0FF╚ i≤ returneΣ fo≥ i⌠ t∩á indicatσ ì curren⌠ user. Thσ strinτ pointeΣ t∩ b∙ H╠ i≤ no⌠ ß conventiona∞ strinτá iε ì thσá sensσá oµ thσ res⌠ oµ thσ SYSLI┬ routines«á Thi≤ strinτá i≤ ì terminateΣ b∙ an∙ oµ thσ followinτ delims¼á a≤ opposeΣ b∙á simpl∙ ì alway≤ beinτ terminateΣ b∙ ß binar∙ zero« Thσ delimite≥ lis⌠ is: ááááá <NULL or Binary 0> <SP or Space> ááááá = _ ; , < > Thσ followinτ arσ valiΣ examples: ááááá test.txt <-- FN=TEXT FT=TXT, B reg = 0FFH, ááááá C reg = 0FFH ááááá a:t <-- FN=T FT=<SP>, B reg = 1, ááááá C reg = 0FFH ááááá 5:t <-- FN=T FT=<SP>, B reg = 0FFH, ááááá C reg = 5 ááááá c10:x.y <-- FN=X FT=Y, B reg = 3, ááááá C reg = 10 Inputs: HL points to the first byte of the target string ááááá (which ends in a delimiter) ááááá DE pts to the first byte of a 36-byte long FCB Outputs: B=Disk Number (1 for A to 16 for P, or 0FFH if ááááá no disk specified) ááááá C=User Number (0 to 31 or '?' for all users, or ááááá 0FFH if no user specified) ááááá HL points to the character which ended the scan ááááá A = 0 and Zero Flag Set (Z) if invalid Disk or User ááááá Specified; A = 0FFH and NZ if no error Registers Affected: PSW, BC, HL SYSLIB Routines Called: CAPS Special Error Conditions: None è Routine Name: INITFCB Function║ ááááá INITFC┬á simpl∙á clear≤ al∞ oµ thσ field≤ oµ ßá 36-bytσ ì áááááFC┬á t∩á zer∩ excep⌠ fo≥ thσ F╬ anΣ F╘ (Filσ Namσá anΣá Filσ ì áááááType⌐ fields¼ whicΦ i⌠ leave≤ untouched. Inputs: DE = pointer to FCB buffer Outputs: None Registers Affected: None SYSLIB Routines Called: FILLB Special Error Conditions: None .fo 7 - Input Line Editors Page # 7.0 Input Line Editors Aεá Inpu⌠ Linσ Edito≥ i≤ useΣ t∩ accep⌠ ß linσ oµ tex⌠á froφ ì thσ user¼ allowinτ hiφ t∩ issuσ command≤ likσ backspacσ anΣ Ctrl-ì ╪á (erasσá al∞á oµ linσ typeΣ s∩ far⌐ t∩ edi⌠ hi≤ tex⌠ a≤á hσá i≤ ì inputtinτá it«á Oncσ thσ tex⌠ ha≤ beeε entered¼á thσ Inpu⌠á Linσ ì Edito≥ return≤ t∩ thσ callinτ prograφ witΦ thσ user'≤ tex⌠ storeΣ ì in a buffer. This text is terminated by a binary 0. Tw∩ oµ thσ Inpu⌠ Linσ Editor≤ iε SYSLI┬ usσ thσ CP/═ BDO╙ t∩ ì providσ thσ linσ edito≥ function«á The∙ mainl∙ servσ t∩ preservσ ì thσá register≤á durinτá thσá functioεá cal∞á anΣá t∩á storσáá thσ ì terminatinτ zer∩ a⌠ thσ enΣ oµ thσ text«á The∙ occup∙ les≤ spacσ ì than the third Input Line Editor, INLINE. Thσ thirΣ Inpu⌠ Linσ Editor¼á INLINE¼á i≤ useΣ wheε securit∙ ì i≤á important«á Unlikσá thσ othe≥ two¼á wheε typinτ ß Ctrl-├á t∩ ì INLINE¼á thσá Inpu⌠á Linσá Edito≥ (anΣ callinτá program⌐á i≤á no⌠ ì aborteΣ anΣ contro∞ returneΣ t∩ CP/M«á Instead¼á thσ Ctrl-├ cha≥ ì i≤ simpl∙ storeΣ iε thσ user'≤ line« Also¼ unlikσ thσ othe≥ two¼ ì INLIN┼á caεá bσá instructeΣá t∩á ech∩á o≥á no⌠á ech∩á thσáá inpu⌠ ì characters«á Thi≤á featurσ i≤ usefu∞ fo≥ program≤ whicΦ wan⌠á t∩ ì inpu⌠á ßá password«á INLIN┼á caε bσ instructeΣ no⌠ t∩á ech∩á thσ ì password¼á bu⌠á i⌠ wil∞ stil∞ providσ thσ linσ editinτá function≤ ì for the user so that he can correct mistakes if he makes them. Routine Name: BBLINE Function: BBLIN┼ provide≤ ß ver∙ convenien⌠ interfacσ t∩ thσ BDO╙ ì fo≥á inpu⌠ linσ edito≥ functions«á I⌠ contain≤ it≤ owεá interna∞ ì buffe≥á fo≥ storagσ oµ thσ inpu⌠ linσ (20░ byte≤ allocated)¼á anΣ ì i⌠á return≤ ß pointe≥ t∩ thσ firs⌠ bytσ oµ thσ linσ upoεá return« ì Thσá linσá storeΣ iε thi≤ buffe≥ i≤ terminateΣ b∙ ßá binar∙á zer∩ ì (0). T∩á usσá BBLINE¼áá thσá use≥á neeΣá onl∙á cal∞á it¼á witΦá ß ì capitalizatioε flaτ storeΣ iε thσ ┴ Register«á Iµ ┴ ╜ 0¼á BBLIN┼ ì doe≤ no⌠ capitalizσ thσ inpu⌠ linσ characters╗á iµ ┴ <╛ 0¼ BBLIN┼ ì capitalize≤á thσá inpu⌠ linσ character≤ beforσ returninτá t∩á thσ ì caller. N∩ erro≥ code≤ arσ returneΣ b∙ BBLINE« Oε return¼ H╠ point≤ ì t∩ thσ firs⌠ bytσ oµ thσ inpu⌠ linσ anΣ ┴ contain≤ ß coun⌠ oµ thσ ì numbe≥ oµ character≤ iε tha⌠ linσ (no⌠ countinτ thσ endinτ zero). Inputs: A=0 to Not Capitalize Line, A<>0 to Capitalize Line Outputs: HL pts to first char in the line A is number of characters in the line (not counting the ending zero) Registers Affected: PSW, HL SYSLIB Routines Called: CAPS Special Error Conditions: None Routine Name: BLINE Function: BLIN┼ provide≤ ß ver∙ convenien⌠ interfacσ t∩ thσá BDO╙ ì fo≥á inpu⌠ linσ edito≥ functions«á I⌠ perform≤ thσ samσ typσá oµ ì functioεá a≤á BBLINE¼á bu⌠ i⌠ doe≤ no⌠ contaiε it≤á owεá interna∞ ì buffer«á Thσ use≥ i≤ expecteΣ t∩ providσ sucΦ ß buffer¼ whicΦ i≤ ì structureΣ a≤ follows: SIZE: DB <Size of Buffer> CCNT: DS 1 LINE: DS <Size of Buffer + 1> ì BLIN┼ return≤ ß pointe≥ t∩ thσ firs⌠ bytσ oµ thσ linσ (LINE⌐ upoε ì return« Thσ linσ storeΣ iε thi≤ buffe≥ i≤ terminateΣ b∙ ß binar∙ ì zer∩ (0). T∩ usσ BLINE¼á thσ use≥ neeΣ onl∙ cal∞ it¼ witΦ ß pointe≥ t∩ ì thσ user'≤ buffe≥ iε H╠ anΣ ß capitalizatioε flaτ storeΣ iε thσ ┴ ì Register«á Iµá ┴ ╜ 0¼á BLIN┼ doe≤ no⌠ capitalizσ thσ inpu⌠á linσ ì characters╗áá iµá ┴á <╛á 0¼á BLIN┼á capitalize≤á thσá inpu⌠á linσ ì character≤ beforσ returninτ t∩ thσ caller. N∩ erro≥ code≤ arσ returneΣ b∙ BLINE«á Oε return¼ H╠ point≤ ì t∩ thσ firs⌠ bytσ oµ thσ inpu⌠ linσ anΣ ┴ contain≤ ß coun⌠ oµ thσ ì numbe≥ oµ character≤ iε tha⌠ line (not counting the ending zero). Inputs: A=0 to Not Capitalize Line, A<>0 to Capitalize Line HL pts to first byte (SIZE) of user-supplied buffer Outputs: HL pts to first char in the line A is number of characters in the line (not counting the ending zero) Registers Affected: PSW, HL SYSLIB Routines Called: CAPS Special Error Conditions: None Routine Name: INLINE Function║ INLIN┼á allow≤á thσ use≥ t∩ inpu⌠ ß linσ oµá tex⌠á froφ ì CON║á int∩ thσ buffe≥ pointeΣ t∩ b∙ HL«á Thσ use≥ i≤ alloweΣá t∩ ì edi⌠á thσá tex⌠á a≤á hσ type≤ it¼á anΣá INLIN┼á respond≤á t∩á thσ ì followinτ edito≥ commands: Key Command Function <BS> Delete previous character and back up cursor <DEL> Delete previous character and echo it <CR> Input complete -- return to calling program <LF> Skip down to next physical line and insert a <CR> <LF> into buffer <TAB> Tabulate to next tab stop (every 8) Ctrl-U, Erase current line (clear buffer) and restart Ctrl-X input Ctrl-R Retype current line Ctrl-┼ Ski≡ dowε t∩ nex⌠ physica∞ line╗ inser⌠ nothing into buffer Oε exit¼á thσ buffe≥ contain≤ thσ tex⌠ entereΣ followeΣ b∙ ß ì <NULL╛ (binar∙ 0)╗á thσ <CR╛ typeΣ t∩ enΣ thσ inpu⌠ i≤ NO╘ placeΣ ì iε thσ buffer. Inputs: HL = pointer to input line buffer A = Echo Flag (A=0 Means Don't Echo Input) Outputs: -None- (Input line buffer contains text typed by user) Registers Affected: -None- SYSLIB Routines Called: CCOUT, CIN, COUT, CRLF Specia∞á Erro≥ Conditions║ <BEL╛á (Bee≡ a⌠ CON:⌐ i≤ outpu⌠ iµ attemp⌠ i≤á madσá t∩ ì deletσá characte≥ (<BS╛ o≥ <DEL>⌐ beforσ beginninτ oµá line«á N∩ ì limi⌠á o≥á erro≥ checkinτ i≤ donσ oε thσ sizσ oµ thσá inpu⌠á linσ ì buffe≥á (buffe≥ overflo≈ i≤ possible¼á s∩ i⌠ i≤ recommendeΣá tha⌠ ì buffe≥á i≤ madσ arbitraril∙ large)«á HasΦ marδ (#⌐ i≤ printeΣ iε ì responsσ t∩ Ctrl-R¼ Ctrl-U¼ anΣ Ctrl-X. Note║á INLIN┼á offer≤á tw∩ feature≤ no⌠ founΣ iε BLIN┼á anΣ ì BBLINE«á First¼á i⌠ canno⌠ bσ aborteΣ b∙ ß Ctrl-C╗ thi≤ i≤ good¼ ì sincσá i⌠á caε bσ useΣ iε "secureó program≤ withou⌠ fea≥á oµá thσ ì use≥ breakinτ ou⌠ oµ thσ program« Second¼ i⌠ caε bσ madσ t∩ ech∩ ì o≥á no⌠á ech∩á thσá input╗á thi≤á provide≤á somσá protectioεá fo≥ ì inputtinτ sensitivσ information¼ likσ ß password. INLIN┼á essentiall∙á provide≤ al∞ oµ thσ conventiona∞á inpu⌠ ì linσ edito≥ functions«á I⌠ i≤ somewha⌠ morσ flexiblσ thaεá BLIN┼ ì anΣá BBLINE¼á bu⌠ thσ tradeofµ i≤ tha⌠ INLIN┼ take≤ u≡ morσ spacσ ì thaε eithe≥ BLIN┼ o≥ BBLINE«á Iµ securit∙ i≤ no⌠ required¼ i⌠ i≤ ì recommendeΣ tha⌠ thσ programme≥ emplo∙ BLIN┼ o≥ BBLIN┼ insteaΣ oµ ì INLINE. .fo 8 - String Output Routines Page # 8.0 String Output Routines -- PRINT, LPRINT, PSTR, LPSTR Routine Names: PRINT, LPRINT Function║ Prin⌠á strinτ pointeΣ t∩ b∙ thσ returε addres≤ oεá CON║ ì (PRINT⌐á o≥ LST║á (LPRINT)«á Strinτ i≤ terminateΣ b∙ ß binar∙ 0« ì Contro∞ i≤ returneΣ t∩ bytσ followinτ string. Inputs: Return Address = pointer to string to be printed Outputs: HL points to byte after string (string is printed on CON: or LST:) Registers Affected: HL SYSLIB Routines Called: PSTR (for PRINT); LSTR (for LPRINT) Specia∞ Erro≥ Conditions: Thσ strinτ MUS╘ bσ terminateΣ b∙ ß binar∙ 0!!! Routine Names: PSTR, LPSTR Function║ Prin⌠á strinτ pointeΣ t∩ b∙ H╠ oε CON║á (PSTR⌐ o≥á LST║ ì (LPSTR)« Strinτ i≤ terminateΣ b∙ ß binar∙ 0. Inputs: HL = pointer to string to be printed Outputs: -None- (string is printed on CON: or LST:) Registers Affected: -None- SYSLI┬á Routine≤ Called║ CCOUT¼á COU╘ (fo≥ PSTR)╗ LCOUT¼ LOU╘ (fo≥ LPSTR) Specia∞ Erro≥ Conditions: Thσ strinτ MUS╘ bσ terminateΣ b∙ ß binar∙ 0!!! .fo 9 - Numeric Output Routines Page # 9.0 Numeric Output Routines 9.01 Output HL as 4 Hexadecimal Characters Routine Names: PHL4HC, LHL4HC Function║ Prin⌠á H╠á a≤ fou≥ (4⌐ hexadecima∞ character≤á oεá CON║ ì (PHL4HC⌐ o≥ LST║ (LHL4HC). Inputs: HL = value to be printed Outputs: -None- (Value is printed) Registers Affected: -None- SYSLIB Routines Called: PA2HC (for PHL4HC); LA2HC (for LHL4HC) Special Error Conditions: -None- Routine Name: MHL4HC Function║ Storσá H╠ a≤ fou≥ (4⌐ hexadecima∞ character≤ iε thσá 4-ì bytσ memor∙ buffe≥ pointeΣ t∩ b∙ DE« Oε return¼ D┼ point≤ t∩ thσ ì bytσ followinτ thi≤ buffer. Inputs: HL = value to be converted and stored DE points to 4-byte buffer Outputs: DE points to byte after buffer Registers Affected: DE SYSLIB Routines Called: MA2HC Special Error Conditions: -None- 9.02 Output HL as 5 Decimal Character Routine Names: PHL5DC, LHL5DC Function║ Prin⌠á H╠á a≤á fivσá (5⌐á decima∞á character≤á oεá CON║ ì (PHL5DC⌐ o≥ LST║ (LHL5DC). Inputs: HL = value to be printed Outputs: -None- (Value is printed) Registers Affected: -None- SYSLIB Routines Called: POUT (for PHL5DC); LOUT (for LHL5DC) Special Error Conditions: -None- Routine Name: MHL5DC Function║ Storσá H╠ a⌠ fivσ (5⌐ decima∞ character≤ iεá memor∙á iε ì thσ 5-bytσ buffe≥ pointeΣ t∩ b∙ DE«á Oε return¼ D┼ point≤ t∩ thσ ì bytσ afte≥ thi≤ buffer. Inputs: HL = value to be converted and stored DE points to a 5-byte buffer Outputs: DE points to the byte following the buffer Registers Affected: DE SYSLIB Routines Called: -None- Special Error Conditions: -None- 9.03 Output HL as Up to 5 Decimal Character with Leading Spaces Routine Names: PHLDC, LHLDC Function║ Prin⌠á H╠á a≤á u≡ t∩ fivσ (5⌐ decima∞á character≤á witΦ ì leadinτ space≤ (<SP>⌐ oε CON║ (PHLDC⌐ o≥ LST║ (LHLDC). Inputs: HL = value to be printed Outputs: -None- (Value is printed) Registers Affected: -None- SYSLIB Routines Called: POUT (for PHLDC); LOUT (for LHLDC) Special Error Conditions: -None- è Routine Name: MHLDC Function║ Storσá H╠á a≤ u≡ t∩ fivσ (5⌐á decima∞á character≤á witΦ ì leadinτ space≤ iε thσ 5-bytσ memor∙ buffe≥ pointeΣ t∩ b∙ DE. Inputs: HL = value to be converted and printed DE points to the 5-byte buffer Outputs: DE points to the byte after the buffer Registers Affected: DE SYSLIB Routines Called: -None- Special Error Conditions: -None- 9.04 Output A as 2 Hexadecimal Characters Routine Names: PA2HC, LA2HC Function║ Prin⌠á ┴á a≤á tw∩ (2⌐ hexadecima∞á character≤á oεá CON║ ì (PA2HC⌐ o≥ LST║ (LA2HC). Inputs: A = value to be printed Outputs: -None- (Value is printed) Registers Affected: -None- SYSLI┬ Routine≤ Called║á E╬ (fo≥ both)╗á POU╘ (fo≥á PA2HC)╗ ì LOU╘ (fo≥ LA2HC) Special Error Conditions: -None- Routine Name: MA2HC Function║ Storσ ┴ a≤ tw∩ (2⌐ hexadecima∞ character≤ iε thσ 2-bytσ ì memor∙á buffe≥ pointeΣ t∩ b∙ DE«á Oε return¼á DE point≤ t∩á bytσ ì afte≥ buffer. Inputs: A = value to be converted and stored DE points to 2-byte buffer Outputs: DE points to byte after this buffer Registers Affected: DE SYSLIB Routines Called: EN Special Error Conditions: -None- è 9.05 Output A as 3 Decimal Characters Routine Names: PA3DC, LA3DC Function║ Prin⌠ ┴ a≤ threσ (3⌐ decima∞ character≤ oε CON║ (PA3DC⌐ ì o≥ LST║ (LA3DC). Inputs: A = value to be printed Outputs: -None- (Value is printed) Registers Affected: -None- SYSLIB Routines Called: POUT (for PA3DC); LOUT (for LA3DC) Special Error Conditions: -None- Routine Name: MA3DC Function║ Storσá ┴ a≤ threσ (3⌐ decima∞ character≤ iε thσá 3-bytσ ì memor∙ buffe≥ pointeΣ t∩ b∙ DE« Oε return¼ DE point≤ t∩ thσ bytσ ì afte≥ thσ buffer. Inputs: A = value to be converted and stored DE points to the 3-byte buffer Outputs: DE points to the byte after the buffer Registers Affected: DE SYSLIB Routines Called: -None- Special Error Conditions: -None- 9.06 Output A as Up to 3 Decimal Characters with Leading Spaces Routine Names: PADC, LADC Function║ Prin⌠á ┴á a≤á u≡ t∩ threσ (3⌐ decima∞á character≤á witΦ ì leadinτ space≤ (<SP>⌐ oε CON║ (PADC⌐ o≥ LST║ (LADC). Inputs: A = value to be printed Outputs: -None- (Value is printed) Registers Affected: -None- SYSLIB Routines Called: POUT (for PADC); LOUT (for LADC) Special Error Conditions: -None- è Routine Name: MADC Function║ Storσá ┴á a≤ u≡ t∩ threσ (3⌐á decima∞á character≤á witΦ ì leadinτ space≤ iε thσ 3-bytσ memor∙ buffe≥ pointeΣ t∩ b∙ DE«á Oε ì return¼ DE point≤ t∩ thσ bytσ afte≥ thσ buffer. Inputs: A = value to be converted and stored DE points to the 3-byte memory buffer Outputs: DE points to the byte after the buffer Registers Affected: DE SYSLIB Routines Called: -None- Special Error Conditions: -None- .fo 10 - String and Value Comparison Routines Page # 10.0 String and Value Comparision Routines Routine Name: COMPHD Function║ Comparσ H╠ t∩ DE«á Oε return¼á Zer∩ Flaτ Se⌠ =╛ HL=DE¼ ì Carr∙ Flaτ Se⌠ =╛ HL<DE. Inputs: HL, DE -- Values to compare Outputs: Zero and Carry Flags Registers Affected: PSW SYSLIB Routines Called: -None- Special Error Conditions: -None- Routine Names: COMPB, COMPBC Function║ Vecto≥ Comparσ Routines« Comparσ thσ vecto≥ pointeΣ t∩ ì b∙á H╠ witΦ tha⌠ pointeΣ t∩ b∙ D┼ (Vector≤ arσ oµ equa∞á length)« ì Vector≤á arσ ┬ byte≤ lonτ fo≥ COMP┬ anΣ B├ byte≤ lonτ fo≥ COMPBC« ì Oεá exit¼á Zer∩á Flaτ Se⌠ indicate≤ tha⌠ vector≤á arσá identical╗ ì Carr∙ Flaτ Se⌠ indicate≤ tha⌠ thσ vecto≥ pointeΣ t∩ b∙ H╠ i≤ les≤ ì thaε thσ vecto≥ pointeΣ t∩ b∙ DE. Inputs: HL, DE -- Pointers to vectors to compare B (for COMPB), BC (for COMPBC) -- number of bytes in vectors Outputs: Zero and Carry Flags Registers Affected: PSW SYSLIB Routines Called: -None- Special Error Conditions: -None- Routine Name: SCANNER Function║ SCANNE╥ scan≤ thσ vecto≥ oµ byte≤ pointeΣ t∩ b∙ H╠á fo≥ ì thσá vecto≥ oµ byte≤ pointeΣ t∩ b∙ DE«á Thσ HL-bytσ vecto≥ i≤á ┬ ì byte≤ lonτ anΣ thσ DE-bytσ vecto≥ i≤ ├ byte≤ long« Oε return¼ iµ ì found¼ H╠ point≤ t∩ thσ beginninτ locatioε withiε thσ origina∞ H╠ ì vecto≥á oµá thσ locateΣ vecto≥ anΣ thσ Zer∩ Flaτ i≤ Set╗á iµá no⌠ ì found¼ Zer∩ Flaτ i≤ no⌠ se⌠ anΣ H╠ i≤ no⌠ affecteΣ (point≤ t∩ thσ ì beginninτ oµ thσ origina∞ HL-bytσ vector). Inputs: HL = Pointer to vector to be scanned DE = Pointer to vector to scan for B = Number of bytes in HL-vector C = Number of bytes in DE-vector Outputs: If found, Zero Set and HL pts to located vector If not found, Zero Reset and HL unaffected Registers Affected: PSW, HL SYSLIB Routines Called: -None- Specia∞á Erro≥á Conditions║á Automatiπá succes≤á iµá vecto≥ ì searcheΣ fo≥ i≤ null. Routine Name: INSTR Function║ INSTRIN╟á Function«á Scaε thσ strinτ pointeΣ t∩ b∙á H╠ ì fo≥ thσ strinτ pointeΣ t∩ b∙ DE«á ┴ strinτ i≤ ß vecto≥ oµá byte≤ ì terminateΣ b∙ ß binar∙ 0. Oε return¼á iµ found¼ Zer∩ Flaτ i≤ Se⌠ anΣ H╠ point≤ t∩ ì 1s⌠ bytσ oµ substrinτ withiε scanneΣ string╗á iµ no⌠ found¼á Zer∩ ì Flaτ i≤ no⌠ se⌠ anΣ H╠ i≤ no⌠ affected. Inputs: HL = Pointer to string to be scanned DE = Pointer to string to scan for Outputs: If found, Zero Set and HL pts to located substring If not found, Zero Reset and HL unaffected Registers Affected: PSW, HL SYSLIB Routines Called: -None- Specia∞ Erro≥ Conditions: Automatiπ succes≤ iµ strinτ searcheΣ fo≥ i≤ null. .fo 11 - Character Input/Output Routines Page # 11.0 Character Input/Output Routines 11.01 <CR> <LF> Output Routine Names: CRLF, LCRLF Function: Print <CR> and <LF> on CON: (CRLF) or LST: (LCRLF). Inputs: -None- Outputs: -None- (<CR> <LF> is printed) Registers Affected: -None- SYSLIB Routines Called: POUT (for CRLF); LOUT (for LCRLF) Special Error Conditions: -None- 11.02 Conditional Input Routine Name: CONDIN Function║ Inpu⌠á ßá characte≥á froφ CON║á iµá onσá i≤á available╗ ì otherwise¼á returεá ßá flaτá statinτá tha⌠á ßá characte≥á i≤á no⌠ ì availablσ oε CON:. Inputs: -None- Outputs: A = character typed at CON: (if available) Zero Flag is set (Z) if no character is available Zero Flag is reset (NZ) if character is available Registers Affected: PSW SYSLIB Routines Called: CST, CIN Special Error Conditions: -None- 11.03 General Input Routines Routine Name: CST Function║ Inpu⌠ thσ statu≤ oε CON║á iε Registe≥ A«á Iµ ReaΣ Datß ì Available¼ A=0╗ otherwise¼ A=1. Inputs: -None- Outputs: A = Console Status 0 --> Read Data Available (RDA) 1 --> Read Data Not Available (Not RDA) Registers Affected: PSW SYSLIB Routines Called: -None- Special Error Conditions: -None- Routine Names: CIN, RIN Function║á Inpu⌠ characte≥ froφ CON║á (CIN⌐ o≥ RDR║ (RIN⌐ iε ì Registe≥ A. Inputs: -None- Outputs: A = Character input from CON: or RDR: Registers Affected: PSW SYSLIB Routines Called: -None- Special Error Conditions: -None- 11.04 General Output Routines Routine Names: COUT, LOUT, POUT Function║ Outpu⌠á characte≥ iε Registe≥ ┴ t∩á CON║á (COUT)¼á LST║ ì (LOUT)¼ o≥ PUN║ (POUT). Inputs: A = Character to output Outputs: -None- (Character is output) Registers Affected: -None- SYSLIB Routine Called: -None- Special Error Conditions: -None- è Routine Names: CCOUT, CLOUT, CPOUT Function║ Outpu⌠á characte≥ iε Registe≥ ┴ t∩á CON║á (COUT)¼á LST║ ì (LOUT)¼á o≥ PUN║á (POUT⌐ witΦ contro∞ characte≥ processing«á Al∞ ì character≤ witΦ ASCI╔ code≤ les≤ thaε <SP╛ (spacσ ╜ 20H⌐ iε valuσ ì excep⌠á <NULL>¼á <BEL>¼á <BS>¼á <LF>¼á anΣ <CR╛ arσ outpu⌠ a≤á aε ì uparro≈á (^⌐á followeΣ b∙ thσ correspondinτ lette≥á generateΣá b∙ ì addinτ 40╚ t∩ thσ characte≥ valuσ (i.e.¼á ▒ output≤ a≤ "^A"¼ ▓ a≤ ì "^B"¼á etc.)«á Again¼ thσ character≤ les≤ thaε <SP╛ iε valuσ NO╘ ì outpu⌠ iε thi≤ manne≥ arσ -- <NULL> <BEL> <BS> <LF> <CR> An∙ characte≥ oµ valuσ greate≥ thaε <SP╛ i≤ outpu⌠ normally. Inputs: A = Character to output Outputs: -None- (Character/Code is output) Registers Affected: PSW (only the Flags; Register A is NOT affected) SYSLI┬ Routine≤ Called║ COU╘ (fo≥ CCOUT)╗ LOU╘ (fo≥ CLOUT)╗ POU╘ (fo≥ CPOUT) Special Error Conditions: -None- .fo 12 - Math Routines Page # 12.0 Math Routines 12.01 Introduction Thi≤á modulσá contain≤ ß se⌠ oµ 16-bi⌠á unsigneΣá arithmetiπ ì routines«á Al∞ routine≤ usσ H╠ a≤ thσ accumulato≥ o≥ thσ result¼ ì anΣá H╠ anΣ D┼ contaiε thσ operand≤ requireΣ (iµ onl∙ onσ operanΣ ì is needed, HL contains it). The available routines are: ADDHD -- HL = HL + DE SUBHD -- HL = HL - DE MULHD -- HL = HL * DE DIVHD -- HL = HL / DE NEGH -- HL = 2's Complement of HL CMPH -- HL = 1's Complement of HL ROTLH -- HL is rotated left one bit position ROTRH -- HL is rotated right one bit position SHFTLH -- HL is shifted left one bit position SHFTRH -- HL is shifted right one bit position ANDHD -- HL = HL AND DE ORHD -- HL = HL OR DE XORHD -- HL = HL XOR DE 12.02 Arithmetic Operations -- ADDHD, SUBHD, MULHD, DIVHD Al∞á oµá thesσ routine≤ operatσ oε H╠ anΣá DE¼á placinτá thσ ì resul⌠á iε HL«á Thσ Carr∙ Flaτ i≤ affected¼á frequentl∙ useΣá t∩ ì indicate overflow. Routine Name: ADDHD Function║ HL = HL + DE Inputs: HL, DE are operands Outputs: HL is result, Carry Flag Set (C) means overflow Registers Affected: HL, PSW SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Routine Name: SUBHD Function║ HL = HL - DE Inputs: HL, DE are operands Outputs: HL is result, Carry Flag Set (C) if HL<DE Registers Affected: HL, PSW SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Routine Name: MULHD Function║ HL = HL * DE Inputs: HL, DE are operands Outputs: HL is result, Carry Set means Overflow Registers Affected: HL, PSW SYSLIB Routines Called: SHFTRH, SHFTLH Specia∞á Erro≥ Conditions║ None Note║á Thi≤á routinσ i≤ optimizeΣ fo≥ speed¼á witΦ ßá mino≥ ì sacrificσá oε size¼á anΣ i⌠ alway≤ take≤ 1╢ loop≤ t∩ perforφá an∙ ì multiplication. Routine Name: DIVHD Function║ HL = HL / DE Inputs: HL, DE are operands Outputs: HL is result Registers Affected: HL SYSLIB Routines Called: SHFTLH Specia∞á Erro≥ Conditions║ None Note║á Thi≤á routinσ i≤ optimizeΣ fo≥ speed¼á witΦ ßá mino≥ ì sacrificσá oε size¼á anΣ i⌠ alway≤ take≤ 1╢ loop≤ t∩ perforφá an∙ ì division. 12.03 Complement Operations -- NEGH and CMPH These routines operate on HL, placing the result into HL. Routine Name: NEGH Function║ HL = 2's Complement of HL Inputs: HL is operand Outputs: HL is result Registers Affected: HL SYSLIB Routines Called: CMPH Specia∞á Erro≥ Conditions║ None Routine Name: CMPH Function║ HL = 1's Complement of HL Inputs: HL is operand Outputs: HL is result Registers Affected: HL SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None è 12.04 Rotate and Shift Operations -- ROTLH, ROTRH, SHFTLH, SHFTRH These operations operate on HL, placing the result into HL. Routine Name: ROTLH Function║ H╠á i≤á rotateΣá lef⌠ onσá bi⌠á position«á Thi≤á i≤á ß ì circula≥á rotate¼á anΣá thσ mos⌠ significan⌠ bi⌠ oµ ╚ i≤á rotateΣ ì into the least significant bit position of L. Inputs: HL is operand Outputs: HL is result Registers Affected: HL SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Routine Name: ROTRH Function║ H╠á i≤á rotateΣá righ⌠ onσ bi⌠á position«á Thi≤á i≤á ß ì circula≥á rotate¼á anΣ thσ leas⌠ significan⌠ bi⌠ oµ ╠ i≤á rotateΣ ì into the most significant bit position of H. Inputs: HL is operand Outputs: HL is result Registers Affected: HL SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Routine Name: SHFTLH Function║ H╠á i≤á shifteΣá lef⌠á onσá bi⌠á position«á Thσá leas⌠ ì significant bit of L is filled with a Zero. Inputs: HL is operand Outputs: HL is result Registers Affected: HL SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Routine Name: SHFTRH Function║ H╠á i≤á shifteΣá righ⌠á onσá bi⌠á position«á Thσá mos⌠ ì significant bit of H is filled with a Zero. Inputs: HL is operand Outputs: HL is result Registers Affected: HL SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None 12.05 Logical Operations -- ANDHD, ORHD, XORHD These operate on HL and DE, placing the result into HL. Routine Name: ANDHD Function║ HL = HL AND DE Inputs: HL and DE are operands Outputs: HL is result Registers Affected: HL SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Routine Name: ORHD Function║ HL = HL OR DE Inputs: HL and DE are operands Outputs: HL is result Registers Affected: HL SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Routine Name: XORHD Function║ HL = HL XOR DE Inputs: HL and DE are operands Outputs: HL is result Registers Affected: HL SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None .fo 13 - CRC Routines Page # 13.0 CRC Routines Thσá CR├á Routine≤ ma∙ bσ useΣ t∩ checδ thσ validit∙á oµá aε ì incominτ seria∞ bytσ streaφ oµ arbitrar∙ length«á Thesσ routine≤ ì computσ anΣ checδ ß truσ 16-bi⌠ Cycliπ Redundanc∙ Codσ (CRC). The use of these routines will guarantee detection of: 1) all single- and double-bit errors 2) all errors with an odd number of error bits 3) all burst errors of length 16 or less Additionally, the following statistics: 1) 99.9969% of all 17-bit error bursts 2) 99.9984% of all possible longer error bursts Thσ followinτ displa∙ illustrate≤ ß typica∞ wa∙ t∩ usσ thesσ ì routines: ; ; EXTERNAL DECLARATIONS OF SYSLIB ROUTINES ; ... EXT CRCCLR ; CLEAR CRC ACCUMULATOR EXT CRCUPD ; UPDATE CRC ACCUMULATOR EXT CRCDONE ; RETURN CRC ACCUMULATOR VALUE EXT COMPHD ; COMPARE HL TO DE, RETURN ZERO IF EQUAL ... CRC$MAKE: ; ROUTINE TO ESTABLISH OUTGOING CRC CALL CRCCLR ; CLEAR CRC <loop CALLing CRCUPD> ; ACQUIRE VALUES CALL CRCDONE ; GET VALUE PUSH H ; SAVE VALUE CRC$CHECK: ; ROUTINE TO CHECK INCOMING CRC VALUE CALL CRCCLR ; CLEAR CRC <loop CALLing CRCUPD> ; ACQUIRE VALUES CALL CRCDONE ; GET 2ND CRC POP D ; GET 1ST CRC IN DE, 2ND IN HL CALL COMPHD ; COMPARE HL TO DE (SYSLIB ROUTINE) JNZ ERROR ; ERROR IF NO MATCH ... Thσá followinτá screeε display≤ describσ thσá CR├á routines« ì Therσ arσ threσ differen⌠ set≤ oµ CR├ computatioε routines¼á eacΦ ì se⌠á workinτ witΦ ß differen⌠ polynomial«á Thσ routinσá se⌠á fo≥ ì CRC▓á use≤ thσ samσ polynomia∞ a≤ thσ publiπ domaiε CRC╦á prograφ ì b∙ KeitΦ Petersen. CRC Routine Polynomial ----------- ---------- CRC X^16 + X^12 + X^5 + 1 CRC1 X^16 + X^15 + X^2 + 1 CRC2 X^16 + X^15 + X^13 + X^7 + X^4 + X^2 + X + 1 Routine Name: CRCCLR, CRC1CLR, CRC2CLR Function║ Clea≥á thσá interna∞ CR├ Accumulato≥ iε preparatioεá t∩ ì CR├ computation. Inputs: None Outputs: None Registers Affected: None SYSLIB Routines Called: None Special Error Conditions: None Routine Name: CRCUPD, CRC1UPD, CRC2UPD Function: Updatσ thσ CR├ Accumulato≥ valuσ witΦ thσ nex⌠ byte. Input: A=byte to be included in CRC Outputs: None Registers Affected: None SYSLIB Routines Called: None Special Error Conditions: None Routine Name: CRCDONE, CRC1DONE, CRC2DONE Function║ Terminatσáá CR├á valuσá accumulatioεá anΣá returεáá thσ ì calculateΣ 16-bi⌠ CR├ value. Inputs: None Output: HL = calculated CRC value Registers Affected: HL SYSLIB Routines Called: None Special Error Conditions: None **** This Page Intentionally Left Blank **** .fo 14 - Random Number Generator Routines Page # 14.0 Random Number Generator Routines Thσ followinτ se⌠ oµ routine≤ arσ useΣ t∩ (1⌐ providσ ß seeΣ ì valuσá fo≥á thσá randoφ numbe≥ generato≥ anΣ (2⌐á cal∞á ßá randoφ ì number generator to return a random number. RNDINI╘á counts¼á waitinτ fo≥ thσ user'≤ keypress¼á a⌠ whicΦ ì poin⌠ i⌠ stop≤ countinτ anΣ use≤ thσ coun⌠ a≤ thσ seeΣ valuσá fo≥ ì the random number generator. RNDSEE─á allow≤á thσá use≥ t∩ specif∙ ß seeΣ valuσá fo≥á thσ ì random number generator. RND returns a random number. Routine Name: RNDINIT Function║ RNDINI╘ enter≤ ß countinτ loop¼ waitinτ fo≥ thσ use≥ t∩ ì strikσ ß ke∙ a⌠ hi≤ console« I⌠ theε set≤ thσ seeΣ valuσ fo≥ thσ ì randoφ numbe≥ generato≥ baseΣ upoε it≤ coun⌠ valuσ a⌠ thσ instan⌠ ì of keypress. The seed value is an 8-bit quantity. Inputs: None (User Keypress) Outputs: None (Seed is set) Registers Affected: None SYSLIB Routines Called: CONDIN, RND Specia∞á Erro≥ Conditions║ None Routine Name: RNDSEED Function║ Thi≤á routinσá allow≤ thσ use≥ t∩ providσ ß seeΣá valuσ ì fo≥á thσ randoφ numbe≥ generator«á Thσ seeΣ i≤ passeΣ iεá thσá ┴ ì register. Inputs: A = Seed Outputs: None (Seed is set) Registers Affected: None SYSLIB Routines Called: RND Specia∞á Erro≥ Conditions║ None è Routine Name: RND Function║ Thi≤ i≤ thσ user-callablσ randoφ numbe≥ generator«á I⌠ ì return≤á ßá pseudo-randoφ numbe≥ (8-bit⌐ iε thσ ┴á registe≥á wheε ì called. Inputs: None Outputs: A = Random Number Registers Affected: PSW SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None .fo 15 - User/Disk Manipulation Routines Page # 15.0 User/Disk Manipulation Routines Thi≤á i≤á ßá se⌠ oµ fou≥ routine≤ whicΦ allo≈á thσá use≥á t∩ ì readil∙ movσ arounΣ betweeε disk≤ anΣ use≥ areas« Thesσ routine≤ ì are: PUTUD -- to save away the current disk/user GETUD -- to restore the disk/user saved by PUTUD RETUD -- to return the current disk/user LOGUD -- to log the user into a specified disk/user PUTU─á anΣ GETU─ arσ designeΣ t∩ bσ useΣ a≤ ßá placσá marke≥ ì anΣá returεá combination«á The∙ arσ intendeΣ t∩ bσ useΣ iεá codσ ì sequences like the following: CALL PUTUD ; Mark current location < move around on disks/users > CALL GETUD ; Return to marked location RETU─ anΣ LOGU─ arσ t∩ bσ useΣ t∩ finΣ ou⌠ wherσ thσ prograφ ì is (RETUD) and to enter a specific disk/user area (LOGUD). Routine Name: PUTUD Function║ PUTU─á save≤ thσ curren⌠ use≥ anΣ disδ number≤ awa∙ fo≥ ì late≥á retrieva∞ b∙ GETUD«á PUTU─ anΣ GETU─ arσ intendeΣá t∩á bσ ì useΣá t∩á savσ anΣ restorσ thσ curren⌠ disδ anΣ use≥ arounΣá somσ ì set of operations in another user/disk area. Inputs: None Outputs: None Registers Affected: None SYSLIB Routines Called: RETUD Specia∞á Erro≥ Conditions║ None Routine Name: GETUD Function║ GETU─á restore≤á thσ curren⌠ use≥ anΣá disδá whicΦá wa≤ ì saved by PUTUD. Inputs: None Outputs: None Registers Affected: None SYSLIB Routines Called: BDOS Specia∞á Erro≥ Conditions║ None Routine Name: LOGUD Function║ LOGU─ log≤ iε thσ disδ specifieΣ b∙ thσ ┬ registe≥ (B=░ ì fo≥ Disδ A) and the user specified by the C register. Inputs: B=Disk (B=0 for Disk A), C=User Outputs: None Registers Affected: None SYSLIB Routines Called: BDOS Specia∞á Erro≥ Conditions║ None Routine Name: RETUD Function║ RETU─á return≤ thσ number≤ oµ thσ curren⌠ use≥ iε ├ anΣ ì current disk in B (B=0 for disk A). Inputs: None Outputs: B=Disk (B=0 for disk A), C=User Registers Affected: BC SYSLIB Routines Called: BDOS Specia∞á Erro≥ Conditions║ None .fo 16 - Sort Routines Page # 16.0 Sort Routine≤ Tw∩á routine≤ arσ provideΣ whicΦ givσ thσ SYSLI┬á programme≥ ì acces≤á t∩ ß ver∙ flexiblσ sortinτ system«á Thσ maiε routinσá i≤ ì calleΣá SORT¼á anΣ i⌠ provide≤ ß utilit∙ whicΦ doe≤ aεá in-memor∙ ì sor⌠á oµá ß se⌠ oµ fixed-lengtΦ records«á Thσ sortinτá techniquσ ì useΣ i≤ ß Shel∞ Sort¼á adapteΣ froφ thσ booδ "Softwarσ Toolsóá b∙ ì Kernigaεá anΣ Plaugher¼á publisheΣ b∙ Addison-Wesly¼á 1976¼á pagσ ì 106« Thi≤ sor⌠ i≤ ver∙ fast¼ mucΦ morσ s∩ thaε thσ simplσ bubblσ ì sort. Thi≤á Shel∞ Sor⌠ caε bσ donσ iε tw∩ ways║á witΦ o≥á withou⌠ ì usinτá pointers«á Sortinτá withou⌠ usinτ pointer≤á i≤á typicall∙ ì slowe≥ thaε sortinτ witΦ pointers¼á anΣ thσ onl∙ advantagσ t∩ no⌠ ì usinτá pointer≤ i≤ thσ saving≤ oµ spacσ whicΦ i≤ takeε u≡ b∙á thσ ì pointer≤ (2*numbe≥ oµ entrie≤ bytes)«á Iµ pointer≤ arσ useΣá fo≥ ì thσá sort¼á theε wheneve≥ aε exchangσ i≤ done¼á thσ pointer≤á arσ ì simpl∙ exchanged¼á rathe≥ thaε thσ ful∞ records¼ anΣ thi≤ greatl∙ ì decreases the sort time in most cases. Thσ SOR╘ routinσ i≤ controlleΣ b∙ passinτ t∩ i⌠ ß pointe≥ t∩ ì ß Sor⌠ Specificatioε Blocδ (SSB⌐ iε DE«á Thi≤ Sor⌠ Specificatioε ì Blocδá i≤á ß serie≤ oµ 2-bytσ word≤ whicΦ contaiεá thσá followinτ ì information: Bytes 0&1: Starting Address of 1st Record Bytes 2&3: Number of Records to Sort Bytes 4&5: Size of Each Record (in Bytes) Bytes 6&7: Address of Compare Routine Provided by User Thi≤á routinσ compare≤ tw∩ records¼á onσ ì ááááááááááááááááááááápointeΣ t∩ b∙ H╠ anΣ thσ othe≥ pointeΣ t∩ b∙ ì áááááááááááááááááááááDE«á Iµ thσ recorΣ pointeΣ t∩ b∙ D┼ i≤ les≤ ì áááááááááááááááááááááiε sortinτ orde≥ thaε tha⌠ pointeΣ t∩ b∙ HL¼ ì áááááááááááááááááááááthi≤ Comparσ Routinσ i≤ t∩ returε witΦ Carr∙ ì áááááááááááááááááááááSe⌠á (C)«á Iµá thσá record≤á arσá equa∞á iε ì ááááááááááááááááááááásortinτá order¼á thi≤ Comparσ Routinσ i≤á t∩ ì áááááááááááááááááááááreturε witΦ Zer∩ Se⌠ (Z)«á Onl∙ thσ PS╫á i≤ ì áááááááááááááááááááááto be affected by the Compare Routine. Bytes 8&9: Address of Pointer Table Bytσ 10║ Flag╗ ░FFH mean≤ t∩ usσ pointers¼ 0 mean≤ not Byte 11: Unused A≤ mentioneΣ previously¼á tw∩ routine≤ arσ availablσ iε thi≤ ì sor⌠ module«á Thσ firs⌠ routine¼ SSBINIT¼ look≤ a⌠ thσ beginninτ ì oµá ßá scratcΦá areßá anΣá thσ initia∞ content≤á oµá aεá SS┬á anΣ ì allocate≤ spacσ fo≥ thσ pointe≥ table«á I⌠ als∩ check≤ t∩ seσ iµ ì thσá buffe≥á requireΣ wil∞ overflo≈ thσá TP┴á (Transien⌠á Prograφ ì Area). Thσ seconΣ routine¼á SORT¼ perform≤ thσ sort¼ anΣ controlleΣ ì by the SSB pointer passed to it in DE. Routine Name: SSBINIT Function║ Thi≤á routinσ load≤ byte≤ 0&▒ (addres≤ oµ firs⌠ record⌐ ì anΣá 8&╣ (addres≤ oµ pointe≥ table⌐ oµ aε SSB¼á checkinτ fo≥á TP┴ ì overflow«á I⌠ i≤ passeΣ thσ star⌠ addres≤ oµ ß scratcΦ area¼ anΣ ì set≤á thσ pointe≥ tablσ t∩ star⌠ here¼á look≤ a⌠ thσ recorΣá sizσ ì anΣ recorΣ coun⌠ entrie≤ oµ aε SSB¼á anΣ add≤ thi≤ produc⌠ t∩ thσ ì addres≤ oµ thσ pointe≥ table«á Thσ resultan⌠ addres≤ i≤ returneΣ ì as the address of the first record. Thi≤á routinσá ma∙á bσ useΣ a≤ describeΣá abovσá beforσá an∙ ì record≤á arσ loadeΣ int∩ memor∙ fo≥ thσ sort¼á o≥ i⌠ ma∙ bσá useΣ ì afte≥ thσ record≤ havσ alread∙ beeε loaded«á Iε thσ latte≥ case¼ ì thσá use≥ shoulΣ savσ thσ star⌠ addres≤ oµ thσ firs⌠á recorΣá anΣ ì cal∞á SSBINI╘á witΦ thσ addres≤ oµ thσ firs⌠ bytσ afte≥ thσá las⌠ ì record«á Oncσá SSBINI╘á ha≤ loadeΣ thσ buffer≤ iεá thσá SS┬á anΣ ì checkeΣá fo≥á ßá TP┴á overflo≈ (notσ tha⌠ thi≤ i≤á donσá fo≥á thσ ì pointer≤ only)¼á i⌠ wil∞ returε t∩ thσ caller¼á a⌠ whicΦ timσ thσ ì calle≥á shoulΣá restorσ thσ firs⌠ tw∩ byte≤ oµ thσ SS┬á t∩á thei≥ ì proper values, the actual start address of the first record. Inputs: HL pts to start of scratch area, DE pts to SSB Outputs: Z Flag is Set (Z) if TPA overflow; NZ if OK Registers Affected: PSW SYSLIB Routines Called: MOVEB Specia∞á Erro≥ Conditions║ None Routine Name: SORT Function║ SOR╘ sort≤ thσ se⌠ oµ fixeΣ lengtΦ record≤ accordinτ t∩ ì thσá contro∞á informatioε iε thσ Sor⌠ Specificatioεá Blocδá (SSB⌐ ì pointed to by DE. Inputs: DE pts to SSB Outputs: None (Records are Sorted) Registers Affected: None SYSLIB Routines Called: MOVEB, PRINT Specia∞á Erro≥ Conditions║ Thσ Erro≥ Messagσ "SOR╘ Pointe≥ Erroró ma∙ bσá printed¼ ì bu⌠ i≤ highl∙ unlikely« Thi≤ indicate≤ ß fla≈ ha≤ developeΣ witΦ ì thσ SOR╘ routinσ fo≥ thi≤ particula≥ case¼á anΣ i⌠ coulΣ no⌠ SOR╘ ì thσá se⌠á oµ record≤ a≤ desired«á Thi≤ erro≥ i≤ fata∞á anΣá wil∞ ì abort to CP/M. .fo 17 - ZCPR2 Feature-Specific Routines Page # 17.0 ZCPR2 Feature-Specific Routines Thi≤ modulσ contain≤ ß serie≤ oµ routine≤ whicΦ arσ designeΣ ì t∩á allo≈ thσ programme≥ t∩ takσ advantagσ oµ ke∙ ZCPR▓á Feature≤ ì withou⌠ doinτ ß lo⌠ oµ programminτ fo≥ himself«á Iεá particular¼ ì facilitie≤ sucΦ a≤ thσ followinτ arσ provided: ZINIMC - Initializatioε -- Settinτ thσ locatioε oµ the multiple command line buffer ZINIEXT - Initialization -- Defining the location of a command search path ZINICI - Initialization -- Setting the current disk/user character definition ZINIDMA - Initialization -- Set the DMA address for ZCPR2 disk Input/Output ZGPINS - Initialization -- Setting all ZCPR2 buffers as required from buffers set up as per the ZCPR2 Utility Standard General Purpose Installation Format ZCPR╤ - Utilit∙ -- Returninτ ß pointe≥ t∩ thσ interna∞ buffers of the first ZCPR2 SYSLIB Module ZMCPTR - Utility -- Returning a pointer to the first byte of the next command ZPFIND - Utility -- Searching for a file along the command search path ZFSTAT - Utility -- Determining the attributes of a file ┴á notσá oεá statu≤ routines║á therσ arσ threσá module≤á iε ì SYSLI┬á whicΦá contain≤á ZCPR2-specifiπá routines«áá Onσá modulσ ì contain≤ jus⌠ ZGPIN╙ anΣ contain≤ n∩ statu≤ returεá routine¼á bu⌠ ì thσ othe≥ tw∩ module≤ contaiε ZCPR╤ anΣ ZCPRQ2¼á resp¼á t∩ returε ì pointer≤á t∩á importan⌠á interna∞ buffer≤ a≤á describeΣá iεá thi≤ ì manual«á Thi≤ chapte≥ describe≤ thσ firs⌠ ZCPR▓ module¼á anΣ it≤ ì status routine is ZCPRQ. Routine Name: ZINIMC Function║ ZINIM├ define≤ thσ basσ addres≤ oµ thσ multiplσ commanΣ ì linσá buffe≥ fo≥ thσ ZCPR▓ system«á Thσ initializatioε performeΣ ì b∙á thi≤á routinσá i≤ useΣ b∙ thσ ZMCPT╥ routinσá t∩á returεá thσ ì pointer to the first character of the next command. Inputs: HL = base address of multiple command line buffer Outputs: None Registers Affected: None SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Note║á Iµá thi≤ routinσ i≤ no⌠ called¼á i⌠ i≤ assumeΣá tha⌠ ì multiple command lines are not supported. Routine Name: ZINIEXT Function║ ZINIEX╘á define≤ thσ basσ addres≤ oµ ßá commanΣá searcΦ ì path«á Thσá ZPFIN─á routinσ use≤ thi≤ basσ addres≤ t∩ star⌠á it≤ ì searcΦ fo≥ ß file«á Notσ tha⌠ thi≤ provide≤ addeΣ flexibilit∙ iε ì tha⌠á thi≤ neeΣ no⌠ necessaril∙ bσ thσ basσ addres≤ oµ thσá ZCPR▓ ì Systeφ commanΣ searcΦ path¼ bu⌠ i⌠ ma∙ bσ thσ basσ addres≤ oµ an∙ ì path (such as a separate path to look for HLP files). Inputs: HL = base address of path Outputs: None Registers Affected: None SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Note║á Iµá thi≤á routinσ i≤ no⌠ called¼á thσ externa∞á patΦ ì default≤ t∩ aε empt∙ path¼á s∩ n∩ harφ i≤ donσ anΣ n∩ searcΦá caε ì bσ performed. Routine Name: ZINICI Function║ ZINIC╔á define≤á thσá characte≥ useΣá t∩á indicatσá thσ ì curren⌠á use≥á o≥ disδ iε thσ ZCPR▓ commanΣá searcΦá path«á Thi≤ ì characte≥á i≤ passeΣ iε A«á Iµ thi≤ routinσ i≤ no⌠á called¼á thσ ì ZCPR2 default of '$' is assumed. Inputs: A = Current Indicator Outputs: None Registers Affected: None SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Note║á Iµá thi≤á routinσ i≤ no⌠ called¼á Curren⌠á Indicato≥ ì defaults to '$'. Routine Name: ZINIDMA Function║ ZINIDM┴ define≤ thσ DM┴ addres≤ useΣ fo≥ al∞ disδ Inpu⌠ ì anΣá Output«á Thi≤ addres≤ i≤ passeΣ iε HL«á Iµ thi≤ routinσ i≤ ì no⌠ called¼ thσ ZCPR▓ defaul⌠ oµ 80╚ i≤ assumed. Inputs: HL = DMA Address Outputs: None Registers Affected: None SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Note║á Iµ thi≤ routinσ i≤ no⌠ called¼á DM┴ Addres≤ default≤ ì t∩ 80H. Routine Name: ZGPINS Function║ ZGPIN╙á initialize≤ thσ ZCPR2-Specifiπ Buffer≤ froφ thσ ì ZCPR▓á Utilit∙ StandarΣ General-Purposσ Installatioε Forma⌠á Bufì fers«á Thi≤ i≤ t∩ bσ useΣ b∙ ZCPR▓ Utilities¼á sucΦ a≤ XDIR3¼ t∩ ì completel∙ initializσ al∞ thσ necessar∙ buffers. Thσ buffer≤ iε thσ utilitie≤ arσ locateΣ a≤ indicateΣ iε thσ ì ZCPR▓ Utilitie≤ Manual. Inputs: None Outputs: None Registers Affected: None SYSLIB Routines Called: MOVEB, ZINIMC, ZINIEXT, ZCPRSET, ZFNINIT Specia∞á Erro≥ Conditions║ None Routine Name: ZCPRQ Function║ ZCPR╤á querie≤á thσ statu≤ oµ thσ SZCP╥á module¼á whicΦ ì contain≤ thesσ routines« Oε exit¼ thi≤ routinσ return≤ ß pointe≥ ì t∩á thσá interna∞ buffer≤ oµ thσ firs⌠ ZCPR▓á modulσá iεá SYSLIB« ì These buffers are structured as follows: Byte 0: Multiple command available flag (0=no) Bytes 1-2: Address of multiple command line buffer, if available Bytes 3-4: Address of external path (empty path if path not set) Byte 5: Current User/Disk Indicator Bytes 6-7: DMA Address Inputs: None Outputs: HL = Base Address of Buffers Registers Affected: HL SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Routine Name: ZMCPTR Function║ ZMCPT╥á return≤ ß pointe≥ t∩ thσ nex⌠ characte≥ iεá thσ ì multiplσ commanΣ linσ iµ multiplσ command≤ arσ enabled«á ┴á flaτ ì is returned which says if multiple commands are enabled or not. Inputs: None Outputs: HL pts to next char in line A=0 and Zero Flag Set (Z) if multiple commands are not available; NZ otherwise Registers Affected: HL, PSW SYSLIB Routines Called: None Specia∞á Erro≥ Conditions║ None Routine Name: ZPFIND Function║ ZPFIN─á searche≤á fo≥ ß filσ alonτ thσá commanΣá searcΦ ì patΦá whosσá basσ addres≤ wa≤ defineΣ wheε thσ programme≥á calleΣ ì ZINIEXT«á I⌠á log≤ int∩ eacΦ disδ anΣ use≥ areß alonτ thσá path¼ ì lookinτ fo≥ thσ filσ whosσ FC┬ i≤ pteΣ t∩ b∙ DE¼á unti∞ i⌠ eithe≥ ì find≤á thσ filσ o≥ reache≤ thσ enΣ oµ thσ patΦ (filσ no⌠á found)« ì Iµ thσ filσ i≤ found¼á i⌠ return≤ thσ disδ anΣ use≥ areß iε whicΦ ì thσ filσ resides«á ZPFIN─ alway≤ return≤ thσ proces≤ t∩ thσ disδ ì and user area it is "currently" logged into. Inputs: DE pts to the FCB of the file to find B is a flag; if B <> 0, search the current disk and user area first; if B=0, do not search the current disk and user area first Outputs: Zero Flag Clear (NZ) and A=0FFH if file found B = Disk (B=0 if Disk A), C=User if file found Zero Flag Set (Z) and A=0 if file not found Registers Affected: BC, PSW SYSLIB Routines Called: BDOS Specia∞á Erro≥ Conditions║ None Routine Name: ZFSTAT Function║ ZFSTA╘á determine≤á thσ attribute≤ oµ thσ filσá iεá thσ ì curren⌠ disδ anΣ use≥ areß whosσ FC┬ i≤ pteΣ t∩ b∙ DE«á I⌠ tell≤ ì the programmer if the file is SYSTEM or not and READ/ONLY or not. Inputs: DE pts to FCB of file Outputs: B=0 means file is NOT System, B<>0 means file is C=0 means file is NOT R/O, C<>0 means file is Zer∩ Flaτ Se⌠ (Z⌐ anΣ A=░ iµ filσ founΣ anΣ BC valid, and Zero Flag Clear (NZ) if file not found Registers Affected: BC, PSW SYSLIB Routines Called: BDOS Specia∞á Erro≥ Conditions║ None Note: ZFSTAT does NOT do a search. .fo 18 - ZCPR2-Specific Named Directory Routines Page # 18.0 ZCPR2-Specific Named Directory Routines Thi≤ se⌠ oµ routine≤ i≤ specifiπ t∩ thσ ZCPR2-Specifiπ NameΣ ì Director∙ Structure«á Thesσ routine≤ providσ thσ programme≥ witΦ ì ßá se⌠á oµ routine≤ whicΦ resolvσ thσ nameΣ director∙á reference≤ ì fo≥ him¼ translatinτ ß nameΣ director∙ int∩ thσ disk/use≥ areß i⌠ ì refers to. Five routines are included in this set: o ZCPRQ2 -- Return Status o ZFNINIT -- Initialize Named Directory Buffers o ZDNFIND -- Scan for Disk Directory Name o ZDNAME -- Load All Disk Directory Name Data o ZFNAME -- Named Directory File Name Scanner Routine Name: ZCPRQ2 Function: ZCPRQ▓á i≤á thσ companioε t∩ ZCPRQ¼á anΣ i⌠á return≤á ß ì pointe≥á t∩ thσ interna∞ buffer≤ oµ thσ seconΣ ZCPR▓ modulσ whicΦ ì contains such buffers. The organization of these buffers is: Byte 0: Max Number of Named Directory Entries Bytes 1-2: Address of memory-resident named directory buffer (or 0 if none) Bytes 3-38: FCB of NAMES.DIR Inputs: None Outputs: HL points to first byte of buffer Registers Affected: HL SYSLIB Routines Called: None Special Error Conditions: None Routine Name: ZFNINIT Function║ ZFNINI╘á allow≤ thσ use≥ t∩ specif∙ thσ addres≤ oµá thσ ì memory-residen⌠á nameΣ director∙ buffer¼á initializσ thσ namσá oµ ì thσá nameΣá director∙ filσ (defaul⌠ namσ oµá NAMES.DIR⌐á t∩á somσ ì othe≥á name¼á anΣá t∩ changσ thσ numbe≥ oµ name≤ permitteΣá iεá ß ì director∙ filσ (defaul⌠ oµ 64). Inputs: DE pts to FCB containing the new file name HL contains address of memory-resident buffer C is the new maximum number of directory names A is a flag indicating values to set as follows: Bit 7 -- Set to 1 to load default FCB fm DE Bit 6 -- Set to 1 to load name count fm C Bit 5 -- Set to 1 to load address fm HL Outputs: None Registers Affected: None SYSLIB Routines Called: MOVEB Specia∞á Erro≥ Conditions║ None Routine Name: ZDNAME Function: ZDNAM┼á load≤ thσ content≤ oµ thσ NAMES.DI╥á filσá int∩ ì thσ memor∙ buffe≥ pointeΣ t∩ b∙ HL« EacΦ entr∙ iε thi≤ buffe≥ i≤ ì structured as follows: Byte 0: Disk Number (A=0) Byte 1: User Number Bytes 2-9: Directory Name, 8 Chars Max, Space Fill at End Inputs: HL pts to the memory buffer extending to the base of the BDOS Outputs: HL pts to the first entry in the buffer C is the number of valid entries, B=0 A is the error flag (A=0 and Z if error) Registers Affected: HL, BC, PSW SYSLIB Routines Called: INITFCB, ZPFIND, FI3$OPEN, F3$GET Special Error Conditions: None Routine Name: ZDNFIND Function║ ZDNFIN─ examine≤ thσ DIR║á prefi° fo≥ eithe≥ ß DU║ forφ ì o≥ ß director∙ name« Iµ i⌠ i≤ determineΣ tha⌠ thσ DIR║ prefi° i≤ ì no⌠ oµ thσ DU║ form¼ theε thσ memory-residen⌠ director∙ buffe≥ i≤ ì scanned¼á iµ present¼á and¼á failinτ that¼á thσ NAMES.DI╥ filσ i≤ ì sough⌠á alonτ thσ ZCPR▓ path¼á loaded¼á anΣ scanneΣ fo≥ ß corresì pondinτ name«á Iµ found¼á thσ correspondinτ use≥ anΣ disδ value≤ ì arσ returned╗ iµ no⌠ found¼ aε erro≥ codσ i≤ returned. Inputs: HL pts to first byte of DIR: prefix A=░ iµ DU║ forφ NO╘ allowed Outputs: B=Disk (B=1 if Disk A, B=0FFH if Current Disk), C=User (C=0FFH if Current User), HL pts to colon, Zer∩ Flaτ Clea≥ (NZ⌐ iµ n∩ error╗ Zer∩ Flaτ Se⌠ (Z) if error, and no valid values returned Registers Affected: BC, HL, PSW SYSLIB Routines Called: INITFCB, ZPFIND, FI3$OPEN, FI3$CLOSE, F3$GET Specia∞ Erro≥ Conditions║ Notσ tha⌠ ZDNFIN─ use≤ Inpu⌠ Filσ ì 3¼á s∩á Inpu⌠á Filσ │ shoulΣ no⌠ bσ openeΣ wheε thi≤á routinσá i≤ ì called«á Also¼á ZPFIN─ i≤ used¼ s∩ thσ programme≥ mus⌠ bσ surσ ß ì proper external path is specified if needed by calling ZINIEXT. Routine Name: ZFNAME Function║ ZFNAM┼á i≤ ß filσ namσ scanner«á Pointinτ t∩ thσ firs⌠ ì characte≥áá oµáá ßáá filσá namσáá specificatioεáá oµáá thσáá forφ ì 'DIR:FILENAME.TYP'¼á wherσá an∙á par⌠á oµ thi≤á specificatioεá i≤ ì optional¼á thi≤á routinσ fill≤ iε aε FC┬á witΦá zeroes¼á properl∙ ì initialize≤á thσá F╬ anΣ F╘ (Filσ Namσ anΣ Filσ Type⌐á field≤á iµ ì 'FILENAME.TYPºá o≥ an∙ par⌠ thereoµ i≤ present¼á anΣ return≤á thσ ì valuσ oµ disδ anΣ use≥ iµ the∙ arσ specifieΣ (o≥ 0FF╚ iµ not). Thσ director∙ indicato≥ 'DIR:'¼á iµ specified¼ ma∙ bσ oµ onσ ì of four forms: DIRECT: -- A named directory, of up to 8 chars long d: -- A disk drive letter u: -- A user number du: -- A disk drive letter and a user number Thσ du║á forφ i≤ checkeΣ first¼ s∩ unnecessar∙ disδ activit∙ ì in looking for the NAMES.DIR file is avoided. Examples of valid input strings: HELP:*.HLP A5:TEST.TXT C?:ABC.* PASCAL:*.COM Inputs: DE pts to FCB to fill, HL pts to first byte of targe⌠ string; FCB is 36 bytes long Outputs: B=Disk (B=1 for Disk A), C=User B=0FFH if no disk specified (current disk) C=0FFH if no user specified (current user) C=? if all user areas specified HL pts to terminating character A=0 and Zero Flag Set (Z) if error in disk or user numbers; A=0FFH and NZ if no error Registers Affected: BC, HL, PSW SYSLIB Routines Called: ZDNFIND Specia∞áá Erro≥áá Conditions║áá Seσáá FNAM┼áá routinσáá fo≥ ì similarities .fo 19 - Miscellaneous Routines Page # 19.0 Miscellaneou≤ Routine≤ Thi≤ sectioε describe≤ thσ followinτ Miscellaneou≤ Routines: BDOS For Direct BDOS Interface BIOS For Direct BIOS Interface CAPS For Character Capitalization CAPSTR For String Capitalization CATH Convert ASCII Character to Hexadecimal CLINE Save Command Line Buffer CODEND Provide End of Code/Data Area EN Exchange Nybbles in A FILLB Fill Memory (up to 255 bytes) FILLBC Fill Memory (up to 65,535 bytes) HFILB Fill Memory (up to 255 bytes) HFILBC Fill Memory (up to 65,535 bytes) MOVEB Move Memory (up to 255 bytes) MOVEBC Move Memory (up to 65,535 bytes) HMOVB Move Memory (up to 255 bytes) HMOVBC Move Memory (up to 65,535 bytes) PAUSE Delay N 10ths of a Second VERSION Return Version Number of SYSLIB Routine Name: BDOS Function║ Cal∞á CP/═á Entr∙á Poin⌠á a⌠ locatioεá ╡á anΣá preservσ ì Register≤ DE anΣ BC. Inputs: C and DE provide input parameters Outputs: A and HL provide output parameters Registers Affected: PSW, HL SYSLIB Routines Called: -None- Special Error Conditions: -Determined by Routines Called- Routine Name: BIOS Function║ BIO╙ provide≤ thσ use≥ witΦ ß direc⌠ interfacσ int∩ thσ ì CP/═á BIOS«á I⌠á i≤ calleΣ witΦ thσ ┴ Reτ containinτá thσá inde° ì offse⌠á int∩ thσ BIO╙ JM╨ table«á N∩ register≤ arσ preserveΣá b∙ ì thi≤ routine«á Thσ content≤ oµ HL¼á DE¼ anΣ B├ arσ passeΣ t∩ thσ ì BIOS unchanged. The following table summarizes the BIOS JMP Table Entries -- Offset Function 0 Cold Start 1 Warm Start 2 Console Status; Returns A=0FFH if char ready, A=0 if not 3 Console Input; Returns char in A 4 Console Output; Char passed in C 5 List Output; Char passed in C 6 Punch Output; Char passed in C 7 Reader Input; Returns char in A 8 Home Disk Head (Return Version Number); Returns Version Number in HL 9 Select Disk; Disk Number (A=0, etc) passed in C 10 Set Track Number; Track Number passed in C 11 Set Sector Number; Sector Number passed in C 12 Set DMA Address; DMA Address passed in BC 13 Read Block from Disk; Returns A=0 if OK, A=1 if Error 14 Write Block to Disk; Returns A=0 if OK, A=1 if Error 15 List Status; Returns A=0FFH if ready to output, A=0 if not 16 Sector Translation; Logical-to-Physical Sector Translation; Logical Sector Number passed in BC and Translate Table Address passed in DE; Returns Physical Sector Number in HL è Inputs: A = Offset (as per Table Above) BC = Input Parameters Outputs: A, HL = Output Parameters Registers Affected: All SYSLIB Routines Called: -None- Special Error Conditions: -None- Routine Name: CAPS Function║ Capitalizσá ASCI╔á characte≥á iε Registe≥ ┴á iµá i⌠á i≤ ì lower-casσá alphabetiπá (a-z)╗á otherwise¼á returε ┴á unaffected« ì Onl∙á thσ lowe≥ seveε bit≤ oµ thσ bytσ arσá considered¼á anΣá thσ ì Mos⌠ Significan⌠ Bi⌠ i≤ maskeΣ ou⌠ t∩ zero. Inputs: A = character to capitalize Outputs: A = capitalized character Registers Affected: PSW SYSLIB Routins Called: -None- Special Error Conditions: -None- Routine Name: CAPSTR Function: CAPST╥ capitalize≤ thσ <NULL>-terminateΣ strinτ pointeΣ ì to by HL. No Registers are affected. Inputs: HL pts to first byte of string Outputs: None (String is Capitalized) Registers Affected: None SYSLIB Routines Called: CAPS Special Error Conditions: None Routine Name: CATH Function║ Conver⌠á thσá ASCI╔á Hexadecima∞á characte≥á iεá thσá ┴ ì Registe≥ t∩ binar∙ iε thσ ┴ Register«á Iµ invaliΣ characte≥ (no⌠ ì 0-9¼ A-F)¼ returε <SP╛ (2░ Hex⌐ iε ┴ Registe≥ a≤ erro≥ code. Input: A = ASCII Hex Character (0-9, A-F) Output: A = Binary value represented by char Registers Affected: PSW SYSLIB Routines Called: -None- Specia∞ Erro≥ Conditions: Iµá invaliΣá he°á char¼á <SP╛ (2░ Hex⌐á returneΣá iεá ┴ ì Register. Routine Name: CLINE Function: T∩á savσ thσ commanΣ linσ buffe≥ pteΣ t∩ b∙ H╠ awa∙á iε ì aε interna∞ buffe≥ a≤ ß string«á Thσ characte≥ coun⌠ i≤á pointeΣ ì t∩ b∙ H╠ (likσ thσ buffe≥ a⌠ 80╚ se⌠ b∙ ZCPR▓ anΣ CP/═ 2.2)¼á anΣ ì thσá buffe≥ content≤ (no⌠ includinτ thσ characte≥ count⌐ i≤ saveΣ ì awa∙ a≤ ß null-terminateΣ string«á Thi≤ routinσ return≤ witΦá H╠ ì pointing to the first character of this string. Inputs: HL points to command line Outputs: HL points to first character of string Registers Affected: HL SYSLIB Routines Called: -None- Special Error Conditions: -None- Routine Name: CODEND Function║ Returεá thσ addres≤ oµ thσ nex⌠ pagσ followinτ thσ las⌠ ì bytσá oµ code«á Thi≤ i≤ usefu∞ iε determininτ wherσ thσá scratcΦ ì areß begins. Inputs: None Output: HL=Address of next page Registers Affected: HL SYSLIB Routines Called: -None- Special Error Conditions: -None- Routine Name: EN Function║ Exchangσá Nybble≤ iε Registe≥ A╗á High-orde≥ fou≥á bit≤ ì arσ exchangeΣ witΦ Low-orde≥ fou≥ bit≤ oµ Registe≥ A. Inputs: A = Byte input Outputs: A = Byte output Registers Affected: PSW SYSLIB Routines Called: -None- Special Error Conditions: -None- Routine Names: FILLB, FILLBC, HFILB, HFILBC Function║ Thesσá routine≤ fil∞ aε areß oµ memor∙ witΦ ßá constan⌠ ì bytσ value«á FILL┬ caε fil∞ u≡ t∩ ß 256-bytσ buffer¼á anΣ FILLB├ ì caε fil∞ u≡ t∩ ß 65,536-bytσ (withiε reason⌐ buffer. FILL┬á anΣ FILLB├ havσ n∩ effect≤ oε an∙á registers«á HFIL┬ ì anΣ HFILB├ botΦ affec⌠ thσ H╠ registe≥ pair¼ anΣ the∙ returε witΦ ì H╠á pointinτ t∩ thσ bytσ afte≥ thσ las⌠ bytσ filled«á HFIL┬á anΣ ì HFILB├á arσá usefu∞ wheε furthe≥ processinτ froφ thσá las⌠á poin⌠ ì filled is desired. Inputs: HL points to the first byte of the buffer B (for FILLB) or BC (for FILLBC) = number of bytes in buffer A = byte value to fill buffer with Outputs: None for FILLB and FILLBC (Buffer is filled) H╠ point≤ t∩ nex⌠ bytσ fo≥ HFIL┬ anΣ HFILBC Registers Affected: None for FILLB, FILLBC; HL for HFILB, HFILBC SYSLIB Routines Called: -None- Special Error Conditions: -None- Routine Names: MOVEB, MOVEBC, HMOVB, HMOVBC Function║ Movσ thσ blocδ oµ memor∙ pointeΣ t∩ b∙ H╠ t∩ thσ memor∙ ì locatioεá pointeΣá t∩ b∙ DE«á MOVE┬ caε movσ u≡á t∩á ßá 256-bytσ ì buffer¼ anΣ MOVEB├ caε movσ u≡ t∩ ß 65,536-bytσ buffer. MOVE┬á anΣ MOVEB├ havσ n∩ effect≤ oε an∙á registers«á HMOV┬ ì anΣ HMOVB├ botΦ affec⌠ thσ H╠ registe≥ pair¼ anΣ the∙ returε witΦ ì H╠ anΣ D┼ pointinτ t∩ thσ bytσ afte≥ thσ las⌠ bytσ moved«á HMOV┬ ì anΣ HMOVB├ arσ usefu∞ wheε furthe≥ processinτ froφ thσ las⌠ poin⌠ ì filleΣ i≤ desired. Inputs: HL points to the 1st byte of the buffer to move DE points to the 1st byte of the buffer to move to B (for MOVEB) or BC (for MOVEBC) = number of bytes in buffer Outputs: None for MOVEB and MOVEBC (Buffer is moved) HL and DE pt to byte after last byte moved for HMOVB and HMOVBC Registers Affected: None for MOVEB, MOVBC; HL, DE for HMOVB, HMOVBC SYSLIB Routines Called: -None- Special Error Conditions: -None- Routine Name: PAUSE Function: Delay N 10ths of a Second. Inputs: HL = N (Number of 10ths of a Second Delay desired) B = Processor Speed in MHz (1, 2, 3, 4, ...) Outputs: None (Routine returns N 10ths of a Second later) Registers Affected: None SYSLIB Routines Called: None Special Error Conditons: None Routine Name: VERSION Function: Return Version Number of SYSLIB. Inputs: None Outputs: HL = Version Number (H=Major, L=Minor) Registers Affected: HL SYSLIB Routines Called: None Special Error Conditons: None .fo 20 - Cross-Reference Listing of SYSLIB Routines Page # 20.0 Cross-Reference Listing of SYSLIB Routines Symbol Defined Referenced ADDHD SMATH ADRCPY SFILEI S0FILE S1FILE S2FILE S3FILE ANDHD SMATH BBLINE SBBLIN BDOS SBODS SZFNAM SZCPR SFOPEN SFEXIS SFMAKE SFCLOS SRENAM SFREAD SFWRIT SFDEL SUD BIOS SBIOS BLINE SBLINE CAPS SCAPS SZFNAM SFNAME SEVAL SEVAL2 SBBLIN SBLINE SCAPST CAPSTR SCAPST CATH SCATH CCOUT SCCOUT SINLIN SPSTR CIN SCIN SCONDI SINLIN CLINE SCLINE CLOUT SCLOUT SLPSTR CMPH SMATH CODEND SCODEN COMPB SCOMP COMPBC SCOMP COMPHD SCOMPH CONDIN SCONDI SRAND COUT SCOUT SINLIN SPSTR SPHL5D SPA2HC SPADC SCRLF SCCOUT CPOUT SCPOUT CRC1CL SCRC1 CRC1DO SCRC1 CRC1UP SCRC1 CRC2CL SCRC2 CRC2DO SCRC2 CRC2UP SCRC2 CRCCLR SCRC CRCDON SCRC CRCUPD SCRC CRLF SCRLF SINLIN CST SCST SCONDI DBUFFE SDIR DFREE SDIR DIRALP SDIR DIRF SDIR DIRFS SDIR DIRLOA SDIR DIRNPA SDIR DIRPAC SDIR DIRSEL SDIR DIRSLO SDIR èSymbol Defined Referenced DIVHD SMATH DPARAM SDIR EN SEN SMA2HC SLA2HC SPA2HC EVAL SEVAL EVAL10 SEVAL1 SEVAL EVAL16 SEVAL2 SEVAL EVAL2 SEVAL4 SEVAL EVAL8 SEVAL3 SEVAL F$CLOS SFCLOS F$DELE SFDEL SFMAKE F$EXIS SFEXIS F$GET SFILEI S0FILE S1FILE S2FILE S3FILE F$MAKE SFMAKE F$MOPE SFOPEN SFILEI F$OPEN SFOPEN SFILEI F$PUT SFILEI S0FILE S1FILE S2FILE S3FILE F$READ SFREAD F$RENA SRENAM F$WRIT SFWRIT F0$GET S0FILE F1$GET S1FILE F2$GET S2FILE F3$GET S3FILE SZFNAM F0$PUT S0FILE F1$PUT S1FILE F2$PUT S2FILE F3$PUT S3FILE FI$CLO SFILEI S0FILE S1FILE S2FILE S3FILE FI0$CL S0FILE FI1$CL S1FILE FI2$CL S2FILE FI3$CL S3FILE SZFNAM FI$OPE SFILEI S0FILE S1FILE S2FILE S3FILE FI0$OP S0FILE FI1$OP S1FILE FI2$OP S2FILE FI3$OP S3FILE SZFNAM FILLB SFILL SINITF FILLBC SFILL FNAME SFNAME Symbol Defined Referenced FO$CLO SFILEI S0FILE S1FILE S2FILE S3FILE FO$OPE SFILEI S0FILE S1FILE S2FILE S3FILE FO0$CL S0FILE FO1$CL S1FILE FO2$CL S2FILE FO3$CL S3FILE FO0$OP S0FILE FO1$OP S1FILE FO2$OP S2FILE FO3$OP S3FILE FSIZE SDIR GETUD SUD HFILB SFILL HFILBC SFILL HMOVB SMOVE HMOVBC SMOVE INITFC SINITF SFIELI SZFNAM INLINE SINLIN INSTR SINSTR LA2HC SLA2HC SLHL4H LA3DC SLADC LADC SLADC LCRLF SLCRLF LHL4HC SLHL4H LHL5DC SLHL5D LHLDC SLHL5D LOGUD SUD LOUT SLOUT SLPSTR SLHL5D SLA2HC SLADC SLCRLF SCLOUT LPRINT SLPRIN LPSTR SLPSTR SLPRIN MA2HC SMA2HC SMHL4H MA3DC SMADC MADC SMADC MHL4HC SMHL4H MHL5DC SMHL5D MHLDC SMHL5D MOVEB SMOVE SZFNAM SSORT SRENAM SZGPIN MOVEBC SMOVE MULHD SMATH NEGH SMATH ORHD SMATH Symbol Defined Referenced PA2HC SPA2HC SPHL4H PA3DC SPADC PADC SPADC PAUSE SPAUSE PHL4HC SPHL4H PHL5DC SPHL5D PHLDC SPHL5D POUT SPOUT SCPOUT PRINT SPRINT SDIR SSORT SRAND PSTR SPSTR SPRINT PUTUD SUD RETUD SUD RIN SRIN ROTLH SMATH ROTRH SMATH RND SRAND RNDINI SRAND RNDSEE SRAND SCANNE SSCANN SHFTLH SMATH SHFTRH SMATH SORT SSORT SSBINI SSORT SUBHD SMATH VERSIO SVERSI XORHD SMATH ZCPRQ SZCPR ZCPRQ2 SZFNAM ZDNAME SZFNAM ZDNFIN SZFNAM ZFNAME SZFNAM ZFNINI SZFNAM SZGPIN ZFSTAT SZCPR ZGPINS SZGPIN ZINICI SZCPR SZGPIN ZINIDM SZCPR SZGPIN ZINIEX SZCPR SZGPIN ZINIMC SZCPR SZGPIN ZMCPTR SZCPR ZPFIND SZCPR SZFNAM .fo 21 - Sample Programs Using SYSLIB Page # .FI SYSLIBS.WS