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.po 2 .he ZCPR - A Z80 Replacement for the CP/M CCP .fo Page # Documentation on ZCPR - A Z80 Replacement for the CP/M CCP ZCPR is a Group Project By the CCP-GROUP: RLC - Richard Conn FJW - Frank Wancho KBP - Keith Peterson RGF - Ron Fowler ZCPR Documentation By RLC Table of Contents ----- -- -------- Introduction 2 Part A: Installation Instructions 4 ZCPR Integration Example 5 Setting the ZCPR Inline Options 8 REL, BASE, CPRLOC, RAS, SUBA, CLEVEL3 8 Customization Symbols 8 NLINES, WIDE, PGDFLT 8 PGDFLG, MAXUSR, SYSFLG, SOFLG, SUPRES, DEFUSR, SPRMPT, CPRMPT, NUMBASE, 9 SECTFLG, FENCE 10 Patching SUBMIT.COM 10 Part B: Usage Instructions and Explanation of Commands 11 The ZCPR Command Hierarchy Search 11 The ZCPR-Resident Commands 14 DIR, ERA 14 LIST, TYPE, SAVE 15 REN, USER, DFU 16 JUMP, GO, GET 17 ZCPR Error Messages 18 Part C: ZCPR Command Levels and How to Use Them 19 Documentation on ZCPR - A Z80 Replacement for the CP/M CCP ZCPR i≤ ß replacemen⌠ fo≥ thσ CP/═ Consolσ CommanΣ Processo≥ ì (CCP⌐á whicΦá i≤á designeΣ t∩ ruε a≤ par⌠ oµá CP/═á oεá Z80-baseΣ ì microcomputers«á Iε mos⌠ case≤ i⌠ i≤ upward-compatible witΦá thσ ì origina∞ CP/═ Versioε 2.▓ CCP. ZCPR¼á however¼á provide≤á man∙ extension≤ t∩ thσ CP/═á CCP« ì IncludeΣ iε thesσ extension≤ arσ thσ followinτ features: « Thσ TYP┼ functioε caε bσ madσ t∩ pagσ o≥ no⌠ pagσ it≤ ì outpu⌠ a⌠ thσ user'≤ discretion «á ┴ LIS╘ functioε i≤ availablσ whicΦ send≤ it≤á outpu⌠ ì t∩ thσ CP/═ LST║ Devicσ anΣ doe≤ NO╘ page «á Thσá DI╥ commanΣ ha≤ beeε extendeΣ t∩ allo≈ thσ disì pla∙ oµ thσ systeφ file≤ o≥ al∞ files « Thσ ER┴ commanΣ no≈ print≤ ou⌠ thσ name≤ oµ thσ file≤ ì i⌠ i≤ erasing «á Thσá curren⌠ use≥ numbe≥ ma∙ bσ includeΣ a≤ par⌠á oµ ì thσ commanΣ prompt╗á iµ thσ use≥ i≤ unde≥ ß numbe≥ othe≥ thaεá 0¼ ì thσ promp⌠ i≤ oµ thσ forφ 'du>º (likσ 'A2>º o≥ 'B10>')¼á and¼á iµ ì thσá use≥ i≤ unde≥ 0¼á thσ promp⌠ ma∙ bσ 'd>º o≥ 'd0>º a≤ pe≥ hi≤ ì choice «á Thσá SUBMI╘ facilit∙ ha≤ beeε changeΣ iεá tw∩á basiπ ì ways: - thσá promp⌠á change≤ t∩ 'du$º o≥ 'd$ºá wheεá thσ ì SUBMI╘ commanΣ i≤ printed - thσ $$$.SU┬ i≤ executeΣ froφ drivσ A║ (notσ tha⌠ ì thσá origina∞á SUBMI╘á probleφ no≈ exists¼á bu⌠ thσá ne≈á SUB.CO═ ì facilit∙á correct≤ it)╗á thσ CCP-GROU╨ definitioε oµ aεá Indirec⌠ ì CommanΣá Filσá no≈á applies¼á anΣ thi≤á definitioεá i≤á tha⌠á an∙ ì sequencσ oµ command≤ whicΦ ma∙ bσ issueΣ froφ thσ consolσ i≤ als∩ ì ßá valiΣá sequencσá oµ command≤ fo≥ executioεá froφá aεá Indirec⌠ ì Command File; hence, the sequence: DIR B: DIR A: ma∙á bσá issueΣá froφ eithe≥ thσ consolσ o≥ aεá Indirec⌠á CommanΣ ì File¼á anΣ thσ result≤ oµ thσ executioε oµ thi≤ sequencσ arσá thσ ì same«á Basically¼á thi≤á say≤á tha⌠ Indirec⌠ CommanΣá File≤á arσ ì upward-compatiblσá t∩ thσ consolσ inpu⌠ (bu⌠ no⌠ necessaril∙ tha⌠ ì thσá content≤á oµ aε Indirec⌠ CommanΣ Filσ ma∙ bσ issueΣá a⌠á thσ ì consolσ withou⌠ modification).è «á ┴ command-searcΦ hierarch∙ i≤ no≈ implementeΣá whicΦ ì i≤ executeΣ roughl∙ a≤ follows: - thσá user'≤ commanΣ i≤ checkeΣ agains⌠ thσá CPR-ì residen⌠ command≤ anΣ executeΣ immediatel∙ iµ ß matcΦ i≤ found - failinτá that¼á thσá curren⌠ use≥ numbe≥ oεá thσ ì curren⌠ disδ i≤ scanneΣ fo≥ thσ CO═ file╗á thσ CO═ filσ i≤ loadeΣ ì anΣ executeΣ iµ found - failinτ that¼ ß defaul⌠ use≥ numbe≥ (initiall∙ ░ ì bu⌠á caε bσ rese⌠ witΦ thσ DF╒ CPR-residen⌠ command⌐ oε thσá curì ren⌠ disδ i≤ scanneΣ fo≥ thσ CO═ file╗ thσ CO═ filσ i≤ loadeΣ anΣ ì executeΣ iµ found - finally¼á failinτ that¼á thσ defaul⌠ use≥ numbe≥ ì oε disδ A║á i≤ scanneΣ fo≥ thσ CO═ file╗á thσ CO═ filσ i≤á loadeΣ ì anΣ executeΣ iµ founΣ o≥ aε erro≥ messagσ (COMMAND?¼ wheε COMMAN─ ì wa≤ thσ user'≤ commanΣ name⌐ i≤ printed «á Thσá numeriπá argumen⌠ fo≥ thσ SAV┼ commanΣ caεá bσ ì specifieΣá iε hexadecima∞ s∩ tha⌠ thσ use≥ ma∙ emplo∙ thσá value≤ ì presented by tools such as DDT exactly as they are given «á ┴á GE╘á commanΣ whicΦ load≤ ß filσá a⌠á ßá specifieΣ ì memor∙ addres≤ anΣ ß JUM╨ commanΣ whicΦ "callsó thσ subroutinσ a⌠ ì ßá specifieΣ memor∙ addres≤ havσ beeε added╗á ß G╧ commanΣá whicΦ ì "callsóá thσá subroutinσ a⌠ 100╚ (subse⌠ oµ thσ JUM╨á capability⌐ ì has also been added Thi≤á documen⌠ provide≤ thσ use≥ oµ ZCPR witΦ thσá followinτ ì information: Part A: Installation Instructions Part B: Usage Instructions and Explanation of Commands Part C: ZCPR Command Levels and How to Use Them Part A Installation Instructions Iεá orde≥ t∩ instal∞ ZCPR oε ß targe⌠ microcompute≥ (mus⌠ bσ ì currently running CP/M 2.2), the user must know two basic things: 1) Where his CCP is currently running in memory 2⌐á Wherσ hi≤ CC╨ i≤ locateΣ iε thσ SYSGE╬á image¼á or¼ ì fo≥ system≤ whicΦ don'⌠ suppor⌠ SYSGE╬ (sucΦ a≤ P&╘ CP/═ 2.▓á fo≥ ì thσ TRS-8░ Mode∞ II)¼ wherσ hi≤ CC╨ i≤ locateΣ oε disδ anΣ ho≈ t∩ ì place the new ZCPR on top of it Thσá firs⌠ questioε i≤ answereΣ relativel∙ easily«á ┴á proì gram¼á knowεá a≤ eithe≥ BDOSLO├ o≥ BDLO├ (fo≥ BDO╙á Locator)¼á i≤ ì provideΣá witΦ ZCPR«á Yo⌡ shoulΣ assemblσ thi≤ prograφ fo≥á you≥ ì particula≥á compute≥ (changσ thσ basσ OR╟ iµ yo⌡ arσ runninτ non-ì ORG-░ CP/M⌐ anΣ executσ it«á Upoε execution¼ i⌠ wil∞ providσ yo⌡ ì witΦá thσ basσ addres≤ oµ (1⌐ thσ BDO╙ anΣ (2⌐ thσ CC╨á fo≥á you≥ ì particula≥ system«á BDOSLO├ ha≤ workeΣ correctl∙ fo≥ al∞ system≤ ì testeΣ s∩ far¼á bu⌠ therσ i≤ alway≤ ß chancσ tha⌠ i⌠ ma∙ NO╘ worδ ì fo≥ somσ non-testeΣ system«á Fo≥ thσ timσ being¼á assumσ tha⌠ i⌠ ì work≤ correctl∙ anΣ recorΣ thσ startinτ basσ pagσ addres≤ oµ you≥ ì CCP. Thσá seconΣ questioε i≤ no⌠ answereΣ nearl∙ s∩á easily«á Iµ ì yo⌡á havσá thσ abilit∙ t∩ SYSGE╬ you≥ system¼á i⌠ i≤ mucΦá easie≥ ì (commonly⌐ thaε iµ yo⌡ d∩ not«á Yo⌡ must¼á afte≥ assemblinτá thσ ì ZCPRá properly¼á integratσ i⌠ int∩ thσ sysgeε (o≥ disk⌐ imagσá oµ ì CP/M«á Thi≤á caεá bσá donσ b∙ obtaininτ ß SYSGE╬ imagσá oµá you≥ ì system¼ scanninτ i⌠ viß ß debugge≥ sucΦ a≤ DD╘ t∩ finΣ thσ offse⌠ ì fo≥ thσ CCP¼á readinτ thσ ne≈ CPR iε oε to≡ oµ thσ olΣá one¼á anΣ ì finall∙á runninτá SYSGE╬ agaiε t∩ placσ thσ resultan⌠á systeφá oε ì disk«á Iµá yo⌡á D╧ NO╘ havσ SYSGE╬ capability¼á ßá Disδá Utilit∙ ì prograφá i≤ requireΣ t∩ locatσ thσ CC╨ oε disδ anΣ theε writσ thσ ì ne≈á ZCPRá oεá to≡á oµ thσ olΣá one«á Thσá ne⌠á resul⌠á oµá thi≤ ì integratioεá i≤á thσ placemen⌠ oµ thσ ne≈ ZCPR ont∩ disδá iεá thσ ì prope≥á placσ s∩ tha⌠ i⌠ wil∞ bσ loadeΣ witΦ thσ res⌠ oµ CP/═á oε ì colΣ boo⌠ anΣ executeΣ properly. T∩ finΣ thσ origina∞ CCP¼ yo⌡ typicall∙ havσ t∩ locatσ i⌠ b∙ ì it≤ appearance«á I⌠ i≤ probabl∙ storeΣ contiguousl∙ oε disk¼ so¼ ì oncσ i⌠ i≤ found¼ ß sequentia∞ overwritσ i≤ al∞ tha⌠ i≤ required« ì Probabilit∙á i≤ extremel∙ higΦ tha⌠ i⌠ i≤ storeΣ contiguousl∙á iε ì thσ SYSGE╬ image«á Thσ CC╨ start≤ witΦ tw∩ (2⌐ anΣ ONL┘ TW╧ jum≡ ì instruction≤á followeΣá b∙ ß buffe≥ areß (possibl∙ containinτá aε ì initia∞á commanΣ and/o≥ thσ Digita∞ ResearcΦá copyrigh⌠á notice)« ì Thσá Digita∞á ResearcΦ manual≤ sho≈ thσ CC╨ t∩ residσ a⌠á addres≤ ì 980╚á iε thσ SYSGE╬ image¼á bu⌠ thi≤ ma∙ var∙á witΦá system«á T∩ ì finΣá thi≤ image¼á usσ DD╘ o≥ somσ othe≥ sucΦ debugger¼á loaΣ thσ ì SYSGE╬ imagσ yo⌡ caε ge⌠ viß SYSGEN¼á anΣ examinσ memor∙ startinτ ì a⌠ arounΣ 900╚ fo≥ thσ tw∩ (anΣ ONL┘ two⌐ jump≤ describeΣá above« ì Iµá yo⌡ finΣ aε areß witΦ morσ thaε tw∩ jump≤ (ß grou≡ oµá them)¼ ì yo⌡á arσ probabl∙ lookinτ a⌠ thσ BIO╙ anΣ shoulΣ g∩ lowe≥ fo≥ thσ ì CCP«á Thσá CC╨ wil∞ probabl∙ star⌠ oε aε eveε pagσ o≥á half-pagσ ì address (like 900H, 980H, 1100H, etc).è No≈ tha⌠ thσ locatioε oµ thσ CC╨ ha≤ beeε found¼ recorΣ thi≤ ì addres≤ fo≥ later« Yo⌡ arσ no≈ read∙ fo≥ thσ integratioε oµ ZCPR ì int∩ you≥ system«á T∩ d∩ this¼ perforφ thσ followinτ step≤ usinτ ì thσá informatioεá oµ thσ pagσ addres≤ oµ thσ CC╨á (obtaineΣá froφ ì BDOSLO├á anΣá calleΣá CPRLO├ withiε ZCPR⌐ anΣá thσá SYSGE╬á imagσ ì address of the CCP (called IMAGE for reference in this document). 1«á Edi⌠á ZCP╥á anΣ se⌠ thσ CPRLO├ equatσ t∩ thσá valuσ ì obtaineΣ froφ above« Als∩ se⌠ an∙ flag≤ anΣ value≤ a≤ yo⌡ desirσ ì (seσ thσ sectioε oε ZCP╥ Customizatioε below)«á Wheεá satisfied¼ ì enΣ thσ edi⌠ session. 2«á Assemblσá ZCPRá witΦ MA├á (o≥á equivalent)«á Thi≤ ì assemble≥á i≤á requireΣá becausσ oµ thσ MACRO≤á used«á Onl∙á thσ ì resultant HEX file is required. 3«á Assuminτ tha⌠ yo⌡ caε usσ SYSGEN¼á obtaiε ß SYSGE╬ ì image of your current CP/M system and save it on disk. 4«á LoaΣá thσá SYSGE╬ imagσ int∩ memor∙ witΦá DD╘á (o≥ ì equivalent)« Oncσ loaded¼ verif∙ tha⌠ thσ origina∞ CC╨ i≤ a⌠ thσ ì IMAG┼á addres≤á founΣ abovσ anΣ computσá thσá integratioεá offse⌠ ì using the DDT H command: H<IMAGE adr>,<CPRLOC adr> Thσá seconΣ numbe≥ displayeΣ give≤ yo⌡ thσ OFFSE╘ valuσá requireΣ ì for step 5. 5«á Integratσá ZCPR int∩ you≥ SYSGE╬ imagσ viß DDT'≤ ╔ ì anΣ ROFFSE╘ commands« Usσ IZCPR.HE╪ (o≥ thσ namσ oµ you≥ versioε ì oµá ZCPR⌐ t∩ loaΣ thσ FC┬ anΣ ROFFSE╘ (wherσ OFFSE╘ wa≤á computeΣ ì iεá ste≡ 4⌐ t∩ loaΣ thσ ZCPR.HE╪ filσ int∩ memor∙ a⌠á thσá prope≥ ì location«á Checδá t∩ seσ tha⌠ ZCPR i≤ indeeΣ properl∙ loadeΣá b∙ ì examining the SYSGEN IMAGE area. 6«á Placσ thσ ne≈ systeφ oε disδ b∙ runninτ SYSGE╬ anΣ ì NOT loading the system from disk (use the memory image). Fo≥áá furthe≥á clarificatioεá oµá thσá abovσá process¼áá thσ ì followinτá i≤ ß samplσ termina∞ sessioε whicΦ outline≤ thσá step≤ ì taken. ZCPR Integration Example B>; Sample terminal session for integrating ZCPR B>sysgen SYSGEN VER 2.2 SOURCE DRIVE NAME (OR RETURN TO SKIP)b SOURCE ON B, THEN TYPE RETURN <-- I hit the RETURN key here FUNCTION COMPLETE / DESTINATION DRIVE NAME (OR RETURN TO REBOOT) <-- and here B>save 44 cpm56.com <-- We now have a SYSGEN image of CP/M to work with èB>xdir XDIR Version 2.6 User Number: 0, Double Density File Attributes: Non-System Filename.Typ Size K Filename.Typ Size K Filename.Typ Size K -------- --- ------ -------- --- ------ -------- --- ------ !TEXTWRK.-12 0 CPR .DOC 8 EE687 .TXT 4 CPR .AQM 34 TFS .HLP 6 EE687PRE.TXT 4 CPR .ASM 50 CONTENTS.T01 6 SW1 .TXT 10 CPR .BAK 4 CONTENTS.T02 4 SW2 .TXT 2 CPM56 .COM 12 CONTENTS.T03 4 B: 30 Entries & 22 Files -- 338K Bytes Remaining File Data: 14 Files -- 154K Bytes Displayed B>bdosloc <-- Now to locate the CCP's address The Base Page Address of this system's BDOS is C5 The Base Page Address of this system's CCP is BD <-- This is it B>ddt cpm56.com <-- Now to find the CCP in the SYSGEN image DDT VERS 2.0 NEXT PC 2D00 0100 -d900,90f <-- Start looking around here 0900 31 80 E7 3E 06 3C 3C FE 1B CA 00 C2 DA 11 E7 D6 1..>.<<......... -da00,a0f 0A00 31 00 01 01 01 0C C5 CD 0F E4 21 00 BE 11 00 04 1.........!..... -db00,b0f 0B00 31 00 01 01 01 11 C5 CD 0F E4 21 00 C0 11 00 02 1.........!..... -db80,b8f 0B80 31 00 01 01 09 01 CD A8 00 21 00 D2 11 00 C2 0E 1........!...... -- Detail Left Out -- -d1100 <-- I found it at 1100H; note the 2 JMP's 1100 C3 FF BD C3 FB BD 50 10 20 20 20 20 20 20 20 20 ......P. 1110 20 20 20 20 20 20 20 20 00 00 00 00 00 00 00 00 ........ 1120 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ -- Detail Left Out -- -^├ <-- Returε t∩ CP/M╗ ╔ kno≈ tha⌠ CPRLO├ wil∞ be BD00H and the IMAGE offset is 1100H B>eΣ cpr.asφ {edi⌠ ZCPR herσ anΣ placσ CPRLOC=BD00H}# -- Detail Left Out -- B>mac cpr $pz sz <-- Now to assemble the CPR CP/M MACRO ASSEM 2.0 C4F0 <-- Note that CPR MUST end before BDOS begins! 014H USE FACTOR END OF ASSEMBLY B>ddt cpm56.com <-- Now to integrate! DDT VERS 2.0 NEXT PC 2D00 0100 -h1100,bd00 <-- Compute offset for new CPR CE00 5400 <-- Offset is 5400H -icpr.hex <-- Init FCB -r5400 <-- Read in new CPR with offset NEXT PC 2D00 0000 -^C <-- Done! B>sysgen <-- Now to SYSGEN onto disk SYSGEN VER 2.2 SOURCE DRIVE NAME (OR RETURN TO SKIP) <-- Use memory image DESTINATION DRIVE NAME (OR RETURN TO REBOOT)b <-- onto B: DESTINATION ON B, THEN TYPE RETURN FUNCTION COMPLETE DESTINATION DRIVE NAME (OR RETURN TO REBOOT) <-- Done for now B> Setting the ZCPR Inline Options Thσá followinτá arσ thσ fou≥ basiπ option≤ availablσ t∩á thσ ì user under ZCPR for customization of his package. Option Name Function REL Configures CPRLOC (CPRLOC equ 0) for integration via MOVCPM rather than the DDT/SYSGEN technique outlined above; set to TRUE for MOVCPM integra- tion or FALSE for DDT/SYSGEN integration BASE Base address of your CP/M system; standard CP/M has a base of 0, but some CP/M systems (such as for the TRS-80 Model I and Heath/Zenith H89/Z89) start physical RAM memory at a higher address; equate BASE to the starting RAM memory address of your system CPRLOC This is the starting address of ZCPR; set the second CPRLOC equate to the address you obtain from BDOSLOC RAS This is an equate which masks out selected ZCPR command functions for security purposes on Remote Access Systems such as Bulletin Boards; the masked out functions currently include SAVE, ERA, REN, JUMP, GO, and GET; set RAS to TRUE to mask these out or FALSE to leave them in SUBA This is an equate which determines the drive onto which ZCPR will look for an executing Indirect Command File. If the basic philosophy of the Indirect Command File described above is to be maintained, this symbol should be set to TRUE (look on drive A: for the $$$.SUB file); if not, this symbol should be set to FALSE (look on the default drive from the $$$.SUB file). To review, the basic philosophy of the Indirect Command File is that any sequence of commands which may be issued from the console (within reason, which means NOT to erase a $$$.SUB file) may also be issued from within an Indirect Command File, and the resultant execution should be identical (same functions performed). CLEVEL3 This equate enables or disables extended Command Leve∞ │ Processing« Iµ se⌠ t∩ TRUE¼ extended Command Level 3 Processing is enabled and the user command line is automatically capitalized, the terminatinτ zer∩ i≤ placeΣ a⌠ thσ enΣ oµ thσ buffer, and the internal CIBPTR is set correctly (see later for more information). Customization Symbols Thσ followinτ symbol≤ arσ provideΣ fo≥ furthe≥ customizatioε ì of ZCPR to a user's particular tastes and hardware facilities. Option Name Function NLINES Number of lines on the user's CRT for paging WIDE This equate is used to select a narrow or wide display under the DIR command; if WIDE is equated to TRUE, each file name is separated by two spaces, a FENCE, and two more spaces; if WIDE is equated to FALSE, each file name is separated by one space, a FENCE, and one more space PGDFLT This is the Paging Default flag for the TYPE command; if PGDFLT is set to TRUE, the TYPE command will page its output by default and the P option on the TYPE command (see below) will prohibit paging; if PGDFLT is set to FALSE, the TYPE command will NOT page its output by default and the P option will enable paging PGDFLG This sets the option character in the command line for the TYPE command (the 'P' mentioned above); if the user wishes to change this option character, he need only change this equate MAXUSR This is the largest user number recognized by the USER command; if the user wishes to protect the higher user areas, he may set this symbol to the highest area normally accessable; 15 is the largest permitted value for MAXUSR SYSFLG This is the option character for the DIR command line which is used to specify that DIR search All Files (both $SYS and $DIR) for its display; the distributed default for this is 'A' SOFLG This is the option character for the DIR command line which is used to specify that DIR search ONLY the $SYS files for its display; the distri- buted default for this is 'S' SUPRES Set SUPRES to TRUE to suppress printing the user number when the user is under User Number 0 or set SUPRES to FALSE to ALWAYS display the User Number with the CPR prompt; with SUPRES set to TRUE, a user on B: in user 0 sees 'B>' as the prompt, but with SUPRES set to FALSE, a user on B: in user 0 sees 'B0>' as the prompt DEFUSR This is the CPR-default user number which is searched in the command hierarchy for the COM files (distributed as 0); the DFU changes this temporarily until a Warm Boot or Cold Boot is done, at which time the search reverts to this value SPRMPT This is the CPR prompt character which indicates that a SUBMIT file is in execution; by default it is set to '$', so prompts like 'A$' appear during SUBMIT file execution CPRMPT This is the CPR prompt character which indicates that the CPR is awaiting a user console command; by default it is set to '>', so prompts like 'A>' appear during user input to the CPR NUMBAS┼ Thi≤ i≤ thσ escapσ characte≥ useΣ b∙ thosσ commands which require a DECIMAL number as an argument; placing this character after the number argument switches the base to HEXADECIMAL; for example, 'SAVE 15 MYFILE' can be expressed as 'SAVE FH MYFILE' if NUMBASE is set to 'H' (the default) SECTFLG This character constant is the suffix option for the SAVE command which specifies that sectors, as opposed to pages, are to be saved; the default value is 'S' FENCE This is the character printed to separate entries in a directory listing; it's default value is '|' Patching SUBMIT.COM SUBMIT.CO═á ma∙ bσ patcheΣ t∩ ruε witΦ ZCP╥ b∙ thσ followinτ ì procedurσá (thi≤á i≤á recommendeΣá iµá thσá use≥á doe≤á no⌠á havσ ì SUB.COM)«á Thi≤á patcΦ simpl∙ make≤ i⌠ alway≤ placσ thσá $$$.SU┬ ì filσ oε Drivσ A:« Illustrative termina∞ sessioε follows: A>ddt b:submit.com DDT VERS 2.0 NEXT PC 0600 0100 -s5bb <-- Patch is at 5BB Hex 05BB 00 1 <-- Change 0 (default drive) to 1 (drive A:) 05BC 24 . <-- That's it! -d5b0 5cf <-- See change 05B0 00 00 00 00 00 00 30 30 31 20 24 01 24 24 24 20 ......001 $.$$$ 05C0 20 20 20 20 53 55 42 00 00 00 1A 1A 1A 1A 1A 1A SUB......... -^C <-- Done A>save 5 newsubmt.com <-- Save new SUBMIT.COM file Part B Usage Instructions and Explanation of Commands Thσá followinτ instruction≤ arσ writteε witΦ thσá assumptioε ì tha⌠á thσá reade≥ i≤ quitσ familia≥ witΦ ho≈ t∩ usσ CP/═ 2.▓á anΣ ì it≤ CCP«á ZCPR i≤ writteε a≤ ß logica∞ extensioε oµ thσ CP/═ 2.▓ ì CC╨ philosoph∙ anΣ shoulΣ bσ addresseΣ a≤ such. The ZCPR Command Hierarchy Search Thσ first¼á anΣ mos⌠ basiπ thing¼ t∩ learε abou⌠ ZCPR i≤ thσ ì orde≥ iε whicΦ i≤ searche≤ fo≥ ß CO═ filσ fo≥ executioε o≥ ß filσ ì specifieΣá b∙ thσ GE╘ command«á Unde≥ thσ CP/═ 2.▓ CCP¼á iµá thσ ì specifieΣá CO═ filσ commanΣ wa≤ no⌠ founΣ oε thσ curren⌠ drivσ iε ì thσá curren⌠ use≥ area¼á thσ CC╨ aborteΣ witΦ aεá erro≥á message« ì ZCPR¼á however¼á continue≤ searchinτ froφ thi≤ poin⌠ ß maximuφ oµ ì tw∩á morσá levels«á Thi≤ commanΣ hierarch∙ searcΦá wa≤á outlineΣ ì abovσ anΣ i≤ describeΣ herσ iε furthe≥ detail. 1«á Iµá thσá commanΣ i≤ oµ thσ forφ 'COMMANDº anΣá NO╘ ì 'd:COMMAND'¼á thσá CPR-residen⌠á commanΣ lis⌠ i≤ searcheΣá fo≥á ß ì match«á Iµá thσá matcΦ i≤ found¼á thσá CPR-residen⌠á commanΣá i≤ ì immediatel∙ processed«á Iµ thσ matcΦ i≤ no⌠ founΣ o≥ thσ commanΣ ì i≤á oµ thσ forφ 'd:COMMAND'¼á thσ nex⌠ ste≡ i≤ taken«á Notσ tha⌠ ì thσá 'd:COMMANDºá forφ i≤ gooΣ fo≥ executinτ ß commanΣá CO═á filσ ì whicΦá ha≤ thσ samσ namσ a≤ ß CPR-residen⌠ commanΣ (sucΦ a≤á SAV┼ ì or DIR). 2«á Iµá thσ commanΣ i≤ oµ thσ forφá 'd:COMMAND'¼á disδ ì drivσá 'd:ºá i≤á temporaril∙ loggeΣ iε fo≥á thσá purposσá oµá thσ ì commanΣá search«á Otherwise¼á thσá currentl∙ logged-iε drivσá i≤ ì used. 3« No≈ thσ filσ nameΣ COMMAND.CO═ i≤ searcheΣ for« Iµ ì found¼á i⌠á i≤ loadeΣ int∩ memor∙ startinτ a⌠ 100╚ anΣá executed« ì If not, proceed to step 4. 4«á No≈á tha⌠á thσ firs⌠ searcΦá fo≥á COMMAND.CO═á ha≤ ì failed¼á thσá CPR check≤ t∩ seσ iµ thσ use≥ i≤ unde≥ thσá curren⌠ ì Defaul⌠ Use≥ Number«á Thσ Defaul⌠ Use≥ Numbe≥ ma∙ bσ tha⌠ se⌠ b∙ ì thσá DEFUS╥ equatσ iε thσ CPR o≥ tha⌠ se⌠ b∙ thσ use≥ viß thσ DF╒ ì command«á DEFUS╥á i≤ iε effec⌠ iµ DF╒ ha≤ no⌠ beeε issueΣá sincσ ì thσ las⌠ Warφ o≥ ColΣ Boot¼ anΣ DF╒ i≤ iε effec⌠ iµ i⌠ wa≤ issueΣ ì sincσ thσ las⌠ Warφ o≥ ColΣ Boot«á Iµ thσ use≥ i≤ NO╘ unde≥á thσ ì curren⌠á Defaul⌠ Use≥ Number¼á ZCPR temporaril∙ log≤ hiφ int∩á i⌠ ì anΣá searche≤á thσ directory«á Iµ COMMAND.CO═ i≤á found¼á i⌠á i≤ ì loadeΣ a≤ describeΣ abovσ anΣ executed« Iµ not¼ ZCPR proceed≤ t∩ ì the next step. 5«á Thσ use≥ i≤ no≈ iε thσ Defaul⌠ Use≥ Number¼ anΣ a⌠ ì thi≤á point¼á ZCPR check≤ t∩ seσ iµ thσ use≥ i≤ oε disδ drivσ A:« ì Iµ not¼ i⌠ temporaril∙ log≤ int∩ A║ anΣ searche≤ thσ defaul⌠ use≥ ì numbe≥á oµá A║á fo≥á COMMAND.COM«á Iµ found¼á i⌠á i≤á loadeΣá a≤ ì describeΣ abovσ anΣ executed«á Iµ not¼á ZCPR print≤ thσá commanΣ ì namσá a≤á aεá erro≥ messagσ anΣ return≤ t∩á commanΣá inpu⌠á mode¼ ì aborting the SUBMIT file if COMMAND came from it. Iεá al∞ case≤ oµ thσ searcΦ above¼á iµ COMMAND.CO═ i≤ found¼ ì afte≥á i⌠á i≤ loadeΣ int∩ memory¼á ZCPR reset≤ thσá use≥á t∩á hi≤ ì origina∞ disδ drivσ anΣ use≥ number« Hence¼ thσ file≤ referenceΣ ì by the user by default are obtained from this environment. T∩á illustratσ thi≤ commanΣ hierarch∙ search¼á conside≥á thσ ì following examples: Example 1: DEFUSR equ 0 {default user number is 0} B10> <-- User is on Drive B:, User Number 10 B10>ASM TEST.BBZ <-- User wishes to assemble TEST.ASM in Drive B:, User 10 <-- At this point, ZCPR looks on B:/10 for ASM.COM, fails, looks on B:/0, fails, and finally looks on A:/0; it finds ASM.COM here and goes back to B:/10 for the file Example 2: DEFUSR equ 0 and DFU issued B10> <-- User is on Drive B:, User Number 10 B10>DFU 5 <-- User Selects User 5 as default B10>ASM TEST.BBZ <-- As above <-- At this point, ZCPR looks on B:/10 for ASM.COM, fails, look on B:/5, fails, and finally looks on A:/5; it fails here also and prints ASM? as an error message Example 3: DEFUSR equ 0 B> <-- User is on Drive B:, User Number 0 B>ASM TEST.BBZ <-- As above <-- At this point, ZCPR looks on B:/0 for ASM.COM, fails, looks on A:/0, fails, and prints error message Example 4: DEFUSR equ 0 A10> <-- User is on Drive A:, User Number 10 A10>ASM TEST.AAZ <-- As above, but file on A: <-- At this point, ZCPR looks on A:/10 for ASM.COM, fails, looks on A:/0, fails, and prints error message Another Example: Fo≥á example¼á iµ thσ use≥ i≤ loggeΣ int∩ Drivσá B║á iε ì Use≥ Areß 10¼ thσ Defaul⌠ Use≥ Numbe≥ i≤ 0¼ anΣ thσ followinτ CO═ ì file≤ arσ presen⌠ a≤ indicateΣ -- WM.COM on Drive A: in User 0 MBASIC.COM on Drive A: in User 0 and on Drive B: in User 0 TEST.COM on Drive B: in User 10 and Drive B: in User 0 theεá thσá followinτá happen≤ wheεá thσá followinτá command≤á arσ ì issued from the console (or Indirect Command File): B10>WM TEST2.TXT \ \ \__ File to be edited \ \__ Invoke the WM.COM file (Word Master editor) \__ User is on Drive B: in User Area 10 Results: ZCPR searche≤ B║á Use≥ 10¼ B║ Use≥ 0¼ anΣ A║ Use≥ ░ fo≥ ì WM.COM╗á i⌠ find≤ WM.CO═ iε A║á Use≥ 0¼á load≤ it¼á log≤ thσ use≥ ì back into B: User 10, and executes it. B10>MBASIC \ \__ Invoke the MBASIC.COM file (MBASIC Interpreter) \__ User is on Drive B: in User Area 10 Results: ZCPR searche≤ B║á Use≥ 1░ anΣ B║ Use≥ ░ fo≥ MBASIC.COM╗ ì i⌠ find≤ MBASIC.CO═ iε B║ Use≥ 0¼ s∩ i⌠ doesn'⌠ bothe≥ t∩ looδ oε ì A║á Use≥ 0«á MBASIC.CO═ i≤ theε loadeΣ anΣ executeΣ a≤ describeΣ ì in the previous example. B10>TEST \ \__ Invoke the TEST.COM file (TEST program) \__ User is on Drive B: in User Area 10 Results: ZCPRá searche≤á B║á Use≥á 1░á fo≥á TEST.COM╗á i⌠á find≤ ì TEST.CO═ iε B║á Use≥ 0¼á s∩ i⌠ doesn'⌠ bothe≥ t∩ looδ furthe≥ (iµ ì i⌠ had¼á i⌠ woulΣ havσ founΣ TEST.CO═ iε B║ Use≥ 0)« TEST.CO═ i≤ ì then loaded and executed as described above. B10>TEST2 \ \__ Invoke the TEST2.COM file (TEST2 program) \__ User is on Drive B: in User Area 10 Results: ZCPR searche≤ B║á Use≥ 10¼ B║ Use≥ 0¼ anΣ A║ Use≥ ░ fo≥ ì TEST2.COM╗á i⌠á doesn'⌠ finΣ it¼á s∩ i⌠ issue≤ thσ erro≥á messagσ ì 'TEST2?', which says it couldn't find TEST2.COM. è The ZCPR-Resident Commands Thσá followinτá page≤ describσ thσá ZCPR-Residen⌠á Commands« ì Thesσá arσ command≤ locateΣ withiε ZCPR itselµ whicΦ arσ executeΣ ì froφ withiε ZCPR« Thσ phrase≤ <afn╛ anΣ <ufn╛ refe≥ t∩ ambiguou≤ ì file name and unambigous file name as per the CP/M convention. Command: DIR Function: To Display a listing of the names of the files on disk Forms: DIR <afn> <-- Displays $DIR files DIR <afn> S <-- Displays $SYS files DIR <afn> A <-- Displays both $DIR and $SYS files Customization Variables: WIDE SYSFLG SOFLG FENCE Examples: DIR *.ASM <-- All $DIR .ASM files DIR *.COM S <-- All $SYS .COM files DIR *.COM A <-- All .COM files Notes: Iµá ßá filσ i≤ scanneΣ fo≥ anΣ n∩ sucΦ namσ exist≤ oεá disk¼ ì thσá 'N∩á Filesº messagσ wil∞ appear«á However¼á iµá ßá filσá i≤ ì scanneΣ fo≥ anΣ thσ namσ exist≤ a≤ ß $SY╙ filσ anΣ $DI╥ file≤ arσ ì beinτá scanneΣ for¼á n∩ filσ namσ i≤ displayeΣ bu⌠ thσ 'N∩ Filesº ì messagσ doe≤ NO╘ appear« Fo≥ example¼ iµ TEST.CO═ i≤ ß $SY╙ filσ ì anΣá 'DI╥á TEST.COMº i≤ issued¼á n∩á messagσá appears«á Iµá 'DI╥ ì TEXT.COMº i≤ issueΣ anΣ TEXT.CO═ doe≤ no⌠ exis⌠ oε disk¼á thσ 'N∩ ì Files' message is displayed. Command: ERA Function: To Erase the specified $R/W files from disk Forms: ERA <afn> <-- Erase both $DIR and $SYS files Customization Variables: WIDE FENCE Examples: ERA *.ASM <-- Erase all .ASM files ERA *.* <-- Erase all files Notes: Iµ ß $R/╧ filσ i≤ encountered¼á ß BDO╙ erro≥ messagσ wil∞ bσ ì displayeΣá anΣ thσ procedurσ i≤ stopped«á Thσ use≥ i≤ unsurσá a⌠ ì thi≤á timσ a≤ t∩ whicΦ file≤ havσ beeε eraseΣ anΣ whicΦ havσá no⌠ ì anΣ shoulΣ check« Sorr∙ fo≥ thi≤ problemí Thσ ERAS┼ commanΣ (t∩ ì bσá giveεá t∩ SIG/═ b∙ RL├ iε thσ nea≥ future⌐ i≤ ßá solutioεá t∩ ì this problem. Command: LIST Function: To Print the specified file on the CP/M LST: device Forms: LIST <ufn> <-- Print the file (no paging) Customization Variables: -None- Examples: LIST TEST.TXT <-- Print TEST.TXT on LST: Notes: Iµá thσ filσ ha≤ ß $SY╙ attribute¼á i⌠ wil∞ bσ founΣ a≤ wel∞ ì as those with $DIR attributes. Command: TYPE Function: To Print the specified file on the CP/M CON: device Forms: TYP┼ <ufn╛ <-- Prin⌠ thσ filσ witΦ thσ paginτ deflt TYPE <ufn> P <-- Print the file with the paging deflt negated Customization Variables: NLINES PGDFLT PGDFLG Examples: TYPE TEST.TXT TYPE TEST.TXT P Notes: Wheεá thσá displa∙ pause≤ durinτ paging¼á typσ an∙á cha≥á t∩ ì continue or ^C to abort. ^S also works. Command: SAVE Function: To Copy the TPA starting at 100H to disk Forms: SAVE <Number of Pages> <ufn> <-- <Number of Pages> in DEC SAVE <Number of Pages>H <ufn> <-- <Number of Pages> in HEX SAVE <Number of Sectors> <ufn> S <-- Number of sectors SAVE <Number of Sectors>H <ufn> S <-- Number of sectors Customization Variables: NUMBASE RAS Examples: SAVE 15 MYFILE.TXT <-- 15 pages saved SAVE FH MYFILE.TXT <-- 15 pages saved SAVE 10H MYFILE.TXT S <-- 16 sectors (8 pages) saved Notes: Iµ thσ filσ namσ t∩ bσ saveΣ alread∙ exists¼á theε SAV┼ wil∞ ì exi⌠ witΦ thσ messagσ 'Delete File?'╗ iµ thσ use≥ REALL┘ want≤ t∩ ì savσá unde≥á thi≤ name¼á hσ ma∙ theε typσ ┘ o≥ ∙ anΣ thσá curren⌠ ì filσ wil∞ bσ deleteΣ anΣ theε recreateΣ containinτ thσá specifieΣ ì part of the TPA. Command: REN Function: To Change the name of a disk file Forms: REN <ufn new>=<ufn old> Customization Variables: RAS Examples: REN NEWFILE.TXT=OLDFILE.TXT Notes: Iµ <ufε new╛ alread∙ exists¼ thσ messagσ 'Deletσ File?º wil∞ ì bσá printeΣá anΣ thσ use≥ ma∙ responΣ witΦ ┘ o≥ ∙ t∩á deletσá thσ ì curren⌠ <ufε new╛ anΣ theε renamσ <ufε old╛ t∩ <ufε new>. Command: USER Function: To Change the current user number Forms: USER <User Number> <-- <User Number> in DEC USER <User Number>H <-- <User Number> in HEX Customization Variables: -None- Examples: USER 15 USER FH USER 0 USER <-- Same as USER 0 Notes: -None- Command: DFU Function: To Temporarily Change the default user number for the command hierarchy search Forms: DFU <User Number> <-- <User Number> in DEC DFU <User Number>H <-- <User Number> in HEX Customization Variables: -None- Examples: DFU 15 DFU FH DFU 0 DFU <-- Same as DFU 0 Notes: See above for explanation. Command: JUMP Function: To "call" the subroutine at the specified page address Forms: JUMP <Address> <Cmd Parms> <-- <Address> in HEX Customization Variables: NUMBASE RAS Examples: JUMP E000 or JUMP E000H <-- Jump to E000H JUMP <-- Jump to 000H JUMP 0 <-- Jump to 000H Notes: JUM╨ perform≤ ß subroutinσ "call"¼ s∩ thσ calleΣ routinσ ma∙ ì return to the ZCPR by either a RET or a Warm Boot. Command: GO Function: To "call" the subroutine starting at 100H Forms: GO <Cmd Parms> <-- Execute reentrant at 100H Customization Variables: RAS Examples: GO *.ASM <-- Assuming XDIR is loaded, gives directory of *.ASM Notes: Thi≤á commanΣ i≤ identica∞ iε functioε t∩ JUM╨á 100H╗á JUMP¼ ì however¼ leave≤ thσ addres≤ a≤ thσ firs⌠ entr∙ iε CP/═ BAS┼ ½ 80╚ ì (the input line buffer), while GO has no such address. Command: GET Function: To load a file from disk into memory starting at the specified page Forms: GET <Address> <ufn> <-- <Address> in HEX Customization Variables: NUMBASE RAS Examples: GET 8000 TEST.80 <-- Load TEST.80 starting at 8000H GE╘ 10░ TEST.8░ o≥ GE╘ 100╚ TEST.8░ <-- LoaΣ TEST.8░ starting at 100H GE╘ ░ TEST.8░ <-- LoaΣ TEST.8░ startinτ a⌠ 000H Notes: GE╘á searche≤ fo≥ thσ specifieΣ filσ accordinτ t∩á thσá samσ ì commanΣá hierarch∙á searcΦ employeΣ b∙ thσ ZCPR commanΣá scanner« ì Hence¼á iµ thσ use≥ i≤ oε B:/1░ anΣ thσ filσ i≤ oε A:/░ witΦá thσ ì curren⌠á defaul⌠ use≥ numbe≥ a⌠ 0¼á GE╘ wil∞ searcΦ froφ B:/1░ t∩ ì B:/0 to A:/0 in looking for the file. ZCPR Error Messages Thσá followinτá arσ thσ erro≥ message≤ issueΣá b∙á ZCPRá anΣ ì their meanings. Message Meaning ? Printed after a command or an argument means that such was invalid No File From DIR, this means that DIR did not locate any files Also from ERA with the same meaning All? Issued in response ERA *.*, asks the user is he really wants to erase all the files. Unlike under the original CP/M 2.2 CCP, single character input is required (Y or y for yes and anything else for no) with NO <CR> to end the line Full From SAVE, means that there is not enough space on disk From GET or command load by CPR, means that there is not enough space in memory Delete File? Froφ RE╬ o≥ SAVE¼ mean≤ tha⌠ thσ filσ specifieΣ alread∙ ì exist≤ oε disδ anΣ thσ use≥ ma∙ typσ ┘ o≥ ∙ t∩ deletσ ì it and proceed with the REN or SAVE function Part C ZCPR Command Levels and How to Use Them ZCPRá Versioε 1.░ anΣ beyonΣ support≤ threσ distinc⌠ commanΣ level≤ iε it≤ implementation« EacΦ leve∞ constitute≤ ß differen⌠ ì way to issue a command for ZCPR to process. CommanΣ Level≤ ▒ anΣ ▓ arσ commoε t∩ al∞ implementation≤á oµ ì CP/═á anΣ CP/Z═ froφ CP/═ Versioε 1.4«á CommanΣ Leve∞ ▒ i≤á tha⌠ ì commanΣ leve∞ iε whicΦ thσ commanΣ i≤ issueΣ b∙ thσ use≥ froφ hi≤ ì consolσá terminal«á Thσá promp⌠á 'd>º o≥ 'du>ºá appear≤á oεá thσ ì terminal¼á anΣá thσá use≥á i≤ alloweΣ t∩ ente≥ thσá commanΣá witΦ ì editinτ froφ thσ terminal« CommanΣ Leve∞ ▓ i≤ tha⌠ commanΣ leve∞ ì in which the command is entered from an executing $$$.SUB file. Iεá botΦ cases¼á thσ commanΣ i≤ storeΣ iε thσ interna∞á ZCPR ì buffe≥ calleΣ CIBUF╞ (CommanΣ Inpu⌠ BUFFer)«á Unde≥ botΦ CommanΣ ì Level≤á ▒á anΣ 2¼á thσ commanΣ i≤ placeΣ int∩á thi≤á buffer¼á thσ ì character≤ oµ thσ commanΣ linσ arσ capitalized¼ ß characte≥ coun⌠ ì whicΦá indicate≤ thσ numbe≥ oµ character≤ iε thσ commanΣ linσá i≤ ì storeΣ iε CBUF╞ (thσ bytσ beforσ CIBUFF)¼á aε endinτ binar∙ ░á i≤ ì placeΣá afte≥á thσ las⌠ characte≥ iε thσ commanΣá line¼á anΣá thσ ì interna∞á pointe≥ CIBPT╥ (CommanΣ Inpu⌠ Buffe≥ PoinTeR⌐ i≤ se⌠ t∩ ì point to CIBUFF (the first character of the command line). CommanΣá Leve∞ │ i≤ aε extendeΣ concep⌠ t∩ CommanΣ Level≤á ▒ ì anΣá ▓á whicΦ i≤ specificall∙ supporteΣ b∙ ZCP╥ Versioεá 1.░á anΣ ì beyond« Thi≤ commanΣ leve∞ allow≤ ß transien⌠ prograφ t∩ placσ ß ì commanΣá linσ int∩ CIBUF╞ anΣ thσ characte≥ coun⌠ int∩ CBUF╞á anΣ ì havσ thi≤ commanΣ linσ executeΣ b∙ ZCPR«á Oncσ contro∞ i≤ transì ferreΣ t∩ ZCP╥ t∩ executσ thσ commanΣ line¼ thσ transien⌠ prograφ ì whicΦá placeΣá thσ commanΣ linσ lose≤ contro∞ anΣ thσ commanΣá i≤ ì executeΣá exactl∙ a≤ thougΦ i⌠ haΣ beeε typeΣ b∙ thσ use≥ a⌠á hi≤ ì consolσ terminal. Iεá orde≥á fo≥á ß transien⌠ prograφ t∩ utilizσá thσá CommanΣ ì Leve∞ │ facility¼ thi≤ prograφ MUS╘ d∩ thσ following: 1« Locatσ thσ ZCPR« Sincσ thσ ZCP╥ i≤ ALWAY╙ 2╦ byte≤ ì iεá sizσ anΣ locateΣ directl∙ unde≥ thσ BDOS¼á thσ transien⌠á caε ì locatσá thσá ZCP╥á b∙ examininτ thσ BDO╙ entr∙á pagσá addres≤á a⌠ ì locatioεá ╖á anΣá subtractinτ ╕ froφ thi≤ numbe≥ (╕á page≤á ╜á 2╦ ì bytes)« Thσ resultinτ numbe≥ i≤ thσ basσ pagσ addres≤ oµ ZCPR. 2«á Storσ thσ commanΣ linσ iε CIBUF╞ anΣ thσ characte≥ ì coun⌠á iεá CBUFF«á Knowinτ thσ basσ pagσ addres≤á oµá ZCPR¼á thσ ì following information is useful in doing this: ORG CPRLOC ;Base Address of ZCPR JMP CPR ;Enter ZCPR and Execute Default Cmd JMP CPR1 ;Enter ZCPR and Don't Execute MBUFF: DB BUFLEN ;Size of CIBUFF in bytes CBUFF: DS 1 ;Number of Bytes in Command Line CIBUFF: DS BUFLEN ;Buffer for Command Line DS 1 ;Buffer for Ending 0 (set by ZCPR) CIBPTR: DS 2 ;Address of CIBUFF (set by ZCPR) 3«á Obtaiεá thσ User/Disδ Flag«á Locatioε ┤á contain≤ ì thi≤ number¼á bu⌠ thσ use≥ ma∙ selec⌠ ß flaτ oµ hi≤ choice« Thi≤ ì flaτá i≤á onσá bytσá long¼á anΣ thσ high-orde≥á nybblσá (┤á bits⌐ ì contain≤á thσ use≥ numbe≥ anΣ thσ low-orde≥ nybblσá contain≤á thσ ì disδá numbe≥ t∩ proces≤ thσ commanΣ from«á Thσ User/Disδ Flaτ i≤ ì to be passed to ZCPR in the C Register. 4« Wheε ready¼ transfe≥ contro∞ t∩ ZCPR t∩ proces≤ thσ ì commanΣ b∙ JMPinτ t∩ thσ basσ addres≤ oµ ZCPR«á Thσ firs⌠ JM╨ iε ì thσ JM╨ Tablσ giveε abovσ i≤ a⌠ thi≤ address« A⌠ thi≤ time¼ ZCPR ì wil∞á loτ iε thσ use≥ anΣ disδ iε thσ User/Disδ Flaτ anΣá proces≤ ì the Command Level 3 Command Line. Thσá followinτá i≤ ß samplσ prograφá whicΦá illustrate≤á thσ ì steps outlined above: ; ; Demonstration of Command Level 3 Facility by RLC ; udflag equ 4 ;Address of User/Disk Flag bdos equ 5 ;Address of BDOS Entry Point org 100h lxi d,prmpt ;Print User Prompt mvi c,9 ;PRINT function call bdos lhld bdos+1 ;Get address of BDOS mov a,h ;High-Order Address in A sui 8 ;A=High-Order Address of CPR mov h,a ;HL=Address of CPR mvi l,0 shld cpr ;Save address in buffer lxi d,6 ;Point to command line buffer dad d ;HL points to command line buffer xchg ;DE points to command line buffer mvi c,10 ;READLN into this buffer call bdos lhld cpr ;Get Address of CPR lda udflag ;Get User/Disk Flag mov c,a ; ... in C pchl ;Run Command Line cpr: ds 2 ;CPR Address buffer prmpt: db 'User Command? $' Enjoy using ZCPR! -- RLC