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Text File | 1993-10-25 | 42.9 KB | 1,486 lines

; ; SELECT DISK ; CMND14: LD A,E ; COPY DRIVE NUMBER ; ; SELECT DISK ; SELDK: AND 0FH ; MASK DRIVE NUMBER LD B,A ; SAVE COUNTER LD DE,(LOGIN) ; GET LOGIN VECTOR OR A ; TEST DRIVE 'A' JR Z,SELDK1 ; YES THEN JUMP SELDK0: RR D ; SHIFT LOGIN VECTOR RR E ; UNTIL BIT 0 REGISTER E DJNZ SELDK0 ; IS CURRENT DRIVE SELDK1: LD HL,DEFDRV ; GET POINTER LAST DRIVE BIT 0,E ; TEST IF DRIVE LOGGED IN JR Z,SELDK2 ; NO, LOGIN DRIVE CP (HL) ; TEST SAME DRIVE RET Z ; YES THEN EXIT SELDK2: LD (HL),A ; SAVE NEW CURRENT DRIVE PUSH DE ; SAVE DRIVE LOGGED IN FLAG LD C,A ; COPY DRIVE NUMBER CALL SELDSK ; DO P2BIOS SELECT LD A,H ; TEST IF ERROR OR L JR Z,SELDK3 ; YES, ILLEGAL DRIVE NUMBER LD E,(HL) ; GET LSB TRANSLATION VECTOR INC HL ; INCREMENT POINTER LD D,(HL) ; GET MSB TRANSLATION VECTOR INC HL ; INCREMENT POINTER LD (TRANS),DE ; SAVE TRANSLATION VECTOR LD (TEMP0),HL ; SAVE ADDRESS TEMP0 INC HL ; INCREMENT TO NEXT ADDRESS INC HL LD (TEMP1),HL ; SAVE ADDRESS TEMP1 INC HL ; INCREMENT TO NEXT ADDRESS INC HL LD (TEMP2),HL ; SAVE ADDRESS TEMP2 INC HL ; INCREMENT TO NEXT ADDRESS INC HL LD DE,DIRBUF ; LOAD DIRBUF POINTER LD BC,8 ; COPY 8 BYTES LDIR LD HL,(IXP) ; GET DRIVE PARAMETER ADDRESS LD C,15 ; COPY 15 BYTES LDIR POP DE ; GET DRIVE LOGGED IN FLAG BIT 0,E ; TEST IT RET NZ ; DRIVE LOGGED IN SO RETURN LD HL,(LOGIN) ; GET LOGIN VECTOR CALL SDRVB ; SET DRIVE BIT IN LOGIN VECTOR LD (LOGIN),HL ; SAVE LOGIN VECTOR JR INITDR ; AND SETUP DRIVE TABLES SELDK3: LD HL,(STSEL) ; LOAD ERROR MESSAGE ADDRESS JP (HL) ; AND DISPLAY ERROR ; ; INIT DRIVE ; CLEAR ALV BIT BUFFER AFTER DRIVE RESET ; INITDR: LD DE,(MAXLEN) ; GET LENGTH ALV BUFFER-1 (BITS) LD A,3 ; DIVIDE BY 8 INITD0: SRL D ; TO GET BYTES RR E DEC A JR NZ,INITD0 INC DE ; INCREMENT, SO ALL BITS ARE CLEARED LD HL,(ALV) ; GET POINTER ALV BUFFER PUSH HL INITD1: LD (HL),0 ; CLEAR 8 BITS INC HL ; INCREMENT POINTER DEC DE ; DECREMENT COUNTER LD A,D ; TEST IF COUNTER ZERO OR E JR NZ,INITD1 ; NOT THEN JUMP POP HL ; GET ALV POINTER LD DE,(NDIR0) ; GET FIRST TWO BYTES ALV BUFFER LD (HL),E ; SAVE LSB INC HL ; INCREMENT POINTER LD (HL),D ; SAVE MSB LD HL,(TEMP0) ; CLEAR NUMBER OF FILES XOR A ; ON THIS DRIVE LD (HL),A ; CLEAR LSB INC HL ; INCREMENT POINTER LD (HL),A ; CLEAR MSB LD (SUBFLG),A ; CLEAR SUBMIT FLAG (RESET DISK COMMAND) CALL SETFCT ; SET FILE COUNT INITD2: LD A,0FFH ; UPDATE DIRECTORY CHECKSUM CALL RDDIR ; READ FCB'S FROM DIRECTORY CALL TSTFCT ; TEST LAST FCB RET Z ; YES THEN EXIT CALL CALDIR ; CALCULATE ENTRY POINT FCB LD A,(HL) ; GET FIRST BYTE FCB CP 0E5H ; TEST EMPTY DIRECTORY ENTRY JR Z,INITD2 ; YES THEN GET NEXT FCB CP 021H ; TEST TIME STAMP JR Z,INITD2 ; YES THEN GET NEXT FCB LD A,(USER) ; GET USER NUMBER CP (HL) ; TEST IF USER IS SAME JR NZ,INITD3 ; NO THEN JUMP INC HL ; POINT TO FILE NAME LD A,(HL) ; GET FIRST CHAR FILENAME SUB '$' ; TEST IF '$' JR NZ,INITD3 ; NOT THEN JUMP DEC A ; LOAD A WITH 0FFH LD (SUBFLG),A ; SAVE IT IN SUBFLG INITD3: LD C,1 ; SET BIT IN ALV BUFFER CALL FILLBB ; SET BITS FROM FCB IN ALV BUFFER CALL SETLF ; UPDATE LAST FILE COUNT JR INITD2 ; AND GET NEXT FCB ; ; SET DRIVE BIT IN HL ; SDRVB: EX DE,HL ; COPY HL=>DE LD HL,1 ; GET MASK DRIVE "A" LD A,(DEFDRV) ; GET CURRENT DRIVE OR A ; TEST IF DRIVE "A" JR Z,SDRVB1 ; YES THEN DONE SDRVB0: ADD HL,HL ; GET NEXT MASK DEC A ; DECREMENT DRIVE COUNTER JR NZ,SDRVB0 ; AND TEST IF DONE SDRVB1: LD A,D ; HL=HL OR DE OR H LD H,A LD A,E OR L LD L,A RET ; EXIT ; ; CALCULATE SECTOR/TRACK DIRECTORY ; STDIR: LD HL,(FILCNT) ; GET FCB COUNTER DIRECTORY SRL H ; DIVIDE BY 4 RR L ; (4 FCB'S / SECTOR) SRL H RR L LD (RECDIR),HL ; SAVE VALUE (USED BY CHECKSUM) EX DE,HL ; COPY IT TO DE LD HL,0 ; CLEAR HL ; ; CALCULATE SECTOR/TRACK ; ENTRY: HL,DE=SECTOR NUMBER (128 BYTE SECTOR) ; RESULT SET TRACK =HL,DE / MAXSEC ; SET SECTOR =HL,DE MOD MAXSEC ; CALST: LD BC,(MAXSEC) ; GET SECTORS/TRACK LD A,17 ; SET UP LOOP COUNTER CALST0: OR A ; TEST HL>=BC SBC HL,BC CCF JR C,CALST1 ; YES THEN JUMP ADD HL,BC ; NO THEN RETORE HL OR A ; AND CLEAR CARRY CALST1: RL E ; SHIFT RESULT IN DE RL D DEC A ; TEST LAST BIT DONE JR Z,CALST2 ; YES THEN EXIT RL L ; SHIFT NEXT BIT IN HL RL H JR CALST0 ; CONTINUE CALST2: PUSH HL ; SAVE SECTOR NUMBER LD HL,(NFTRK) ; GET FIRST TRACK ADD HL,DE ; ADD TRACK NUMBER LD B,H ; COPY IT TO BC LD C,L CALL SETTRK ; P2BIOS CALL SET TRACK POP BC ; RESTORE SECTOR NUMBER LD DE,(TRANS) ; GET TRANSLATION TABLE ADDRESS CALL SECTRN ; P2BIOS CALL SECTOR TRANSLATION LD B,H ; COPY RESULT TO BC LD C,L JP SETSEC ; P2BIOS CALL SET SECTOR ; ; GET DISK MAP BLOCK NUMBER FROM FCB ; EXIT HL=ADDRESS FCB ; DE=DM ; BC=OFFSET IN DM ; GETDM: LD C,(IX+32) ; GET NEXT RECORD LD A,(NBLOCK) ; GET NUMBER OF BLOCKS LD B,A ; SAVE IT GETDM0: SRL C ; SHIFT NEXT RECORD DJNZ GETDM0 ; NUMBER OF BLOCKS TIMES GETDM1: CPL ; COMPLEMENT NUMBER OF BLOCKS ADD A,9 ; ADD 9 LD B,A ; B=8-NUMBER OF BLOCKS LD A,(NEXTND) ; GET EXTENT MASK AND (IX+12) ; MASK WITH EXTENT RRCA ; ROTATE ONE RIGHT GETDM2: RLCA ; ROTATE ONE LEFT DJNZ GETDM2 ; 8-NUMBER OF BLOCKS TIMES GETDM3: ADD A,C ; ADD THE TWO VALUES TO GET ENTRY FCB GETDM4: PUSH IX ; GET FCB ADDRESS POP HL LD C,16 ; ADD OFFSET 16 TO POINT TO DM ADD HL,BC LD C,A ; ADD ENTRY FCB ADD HL,BC LD A,(MAXLEN+1) ; TEST 8 BITS/16 BITS FCB ENTRY OR A JR NZ,GETDM5 ; 16 BITS => JUMP LD E,(HL) ; GET 8 BIT VALUE LD D,0 ; MAKE MSB ZERO RET ; AND EXIT GETDM5: ADD HL,BC ; ADD TWICE (16 BIT VALUES) LD E,(HL) ; GET LSB INC HL ; INCREMENT POINTER LD D,(HL) ; GET MSB DEC HL ; DECREMENT POINTER RET ; AND EXIT ; ; CALCULATE SECTOR NUMBER ; ENTRY: DE=BLOCK NUMBER FROM FCB ; CALSEC: LD HL,0 ; CLEAR MSB SECTOR NUMBER LD A,(NBLOCK) ; GET LOOP COUNTER LD B,A ; SAVE IT IN B CALSC0: SLA E ; SHIFT L,D,E RL D RL L DJNZ CALSC0 ; B TIMES CALSC1: LD A,(NMASK) ; GET SECTOR MASK AND (IX+32) ; AND WHIT NEXT RECORD OR E ; SET UP LSB SECTOR NUMBER LD E,A RET ; AND EXIT ; ; CALCULATE DIRBUF ENTRY POINT ; CALDIR: LD HL,(DIRBUF) ; GET START ADDRESS DIRBUF LD A,(SECPNT) ; GET SECTOR POINTER ADD A,L ; ADD L=L+A LD L,A RET NC ; NO CARRY EXIT INC H ; INCREMENT H RET ; AND EXIT ; ; INIT FILE COUNT ; SETFCT: LD HL,-1 ; SET UP FILE COUNT LD (FILCNT),HL ; SAVE IT RET ; AND EXIT ; ; TEST FILE COUNT ; TSTFCT: LD HL,(FILCNT) ; TEST FILE COUNT=0FFFFH LD A,H ; GET MSB AND L ; AND LSB INC A ; TEST IF RESULT=0FFH RET ; AND EXIT ; ; SET LAST FILE ; SETLF: CALL TSTLF ; TEST LAST FILE RET C ; NO THEN EXIT INC DE ; INCREMENT LAST FILE LD (HL),D ; SAVE IT IN TEMP0 DEC HL LD (HL),E RET ; AND EXIT ; ; TEST LAST FILE ; TSTLF: LD HL,(TEMP0) ; GET POINTER TO LAST FILE LD DE,(FILCNT) ; GET FILE COUNTER LD A,E ; SUBTRACT DE-(HL) SUB (HL) INC HL LD A,D SBC A,(HL) RET ; EXIT ; ; GET NEXT FCB FROM DRIVE ; ENTRY A=0 CHECK CHECKSUM, A=0FFH UPDATE CHECKSUM ; RDDIR: LD C,A ; SAVE CHECKSUM FLAG LD HL,(FILCNT) ; GET FILE COUNTER INC HL ; INCREMENT IT LD (FILCNT),HL ; AND SAVE IT LD DE,(NFILES) ; GET MAXIMUM NUMBER OF FILES OR A ; CLEAR CARRY SBC HL,DE ; TEST IF LAST FILE ADD HL,DE JR Z,RDDIR0 ; NO JUMP JR NC,SETFCT ; YES SET FILE COUNT TO 0FFFFH RDDIR0: LD A,L ; GET FILE COUNT LSB ADD A,A ; *32 ADD A,A ADD A,A ADD A,A ADD A,A AND 060H ; MASK IT LD (SECPNT),A ; SAVE IT FOR LATER USE RET NZ ; RETURN IF NOT FISRT FCB SECTOR PUSH BC ; SAVE CHECKSUM FLAG CALL STDIR ; CALCULATE SECTOR/TRACK DIRECTORY CALL READDR ; READ SECTOR DIRECTORY POP BC ; RESTORE CHECKSUM FLAG ; ; UPDATE/CHECK CHECKSUM DIRECTORY ; ENTRY C=0 CHECK CHECKSUM, C=0FFH UPDATE CHECKSUM ; CHKDIR: LD HL,(NCHECK) ; GET NUMBER OF CHECKED RECORDS LD DE,(RECDIR) ; GET CURRENT RECORD OR A ; CLEAR CARRY SBC HL,DE ; TEST CURRENT RECORD RET Z ; EXIT IF ZERO RET C ; EXIT IF GREATER THEN NCHECK LD HL,(DIRBUF) ; GET DIRBUF LD B,128 ; SET UP COUNTER XOR A ; CLEAR CHECKSUM CHKDR0: ADD A,(HL) ; ADD CHECKSUM INC HL ; INCREMENT POINTER DJNZ CHKDR0 ; 128 TIMES LD HL,(CSV) ; GET POINTER CHECKSUM DIRECTORY ADD HL,DE ; ADD CURRENT RECORD INC C ; TEST CHECKSUM FLAG JR Z,CHKDR1 ; 0FFH=> UPDATE CHECKSUM CP (HL) ; TEST CHECKSUM RET Z ; EXIT IF OK ;Automatic disk logging--instead of setting read/only flag when disk is ;changed, a disk changed flag is set. The disk is reset when the SEARCH ;routine is called. ; JP SETWPD LD A,TRUE ; set disk changed flag LD (DIFF),A JP SETFN ; set number of files CHKDR1: LD (HL),A ; UPDATE CHECKSUM RET ; AND EXIT ; ; READ SECTOR FROM DRIVE ; ; ;Readr and Writer modified to give separate error messages--B.H. READR: CALL READ ; P2BIOS CALL READ SECTOR LD HL,(SRDERR) JR WRITE0 ; ; WRITE SECTOR ON DRIVE ; WRITER: CALL WRITE ; P2BIOS CALL WRITE SECTOR LD HL,(SWRTER) WRITE0: OR A ; TEST EXIT CODE RET Z ; EXIT IF OK LD A,1 LD (RETFLG),A JP (HL) ; P2DOS ERROR ON D: BAD SECTOR ; ; READ DIRECTORY FROM DRIVE ; READDR: CALL DMADIR ; SET UP DMA DIRECTORY CALL READR ; READ RECORD JR STDMA ; SET UP DMA USER ; ; WRITE DIRECTORY ON DRIVE ; WRITDR: LD C,0FFH ; UPDATE CHECKSUM DIRECTORY CALL CHKDIR CALL DMADIR ; SET UP DMA DIRECTORY LD C,1 ; WRITE DIRECTORY FLAG CALL WRITER ; WRITE RECORD JR STDMA ; SET UP DMA USER ; ; SET DMA ADDRESS COMMAND ; CMND26: LD (DMA),DE ; SAVE DMA ADDRESS ; ; SET DMA ADDRESS ; STDMA: LD BC,(DMA) ; GET DMA ADDRESS JR DMADR0 ; AND DO P2BIOS CALL ; ; SET DMA ADDRESS DIRECTORY ; DMADIR: LD BC,(DIRBUF) ; GET DMA ADDRESS DIRECTORY DMADR0: JP SETDMA ; P2BIOS CALL SET DMA ; ; GET BIT FROM ALV BUFFER ; ENTRY DE=BLOCK NUMBER ; EXIT A =BIT IN LSB ; B =BITNUMBER IN A ; HL=POINTER IN ALV BUFFER ; GETBIT: LD A,E ; GET BIT NUMBER AND 7 ; MASK IT INC A ; ADD 1 LD B,A ; SAVE IT LD C,A ; TWICE SRL D ; GET BYTE NUMBER RR E ; DE=DE/8 SRL D RR E SRL D RR E LD HL,(ALV) ; GET START ADDRESS ALV BUFFER ADD HL,DE ; ADD BYTE NUMBER LD A,(HL) ; GET 8 BITS GETBT0: RLCA ; GET CORRECT BIT DJNZ GETBT0 LD B,C ; RESTORE BIT NUMBER RET ; AND RETURN TO CALLER ; ; SET/RESET BIT IN ALV BUFFER ; ENTRY DE=BLOCK NUMBER ; C =0 RESET BIT, C=1 SET BIT ; SETBIT: PUSH BC ; SAVE SET/RESET BIT CALL GETBIT ; GET BIT AND 0FEH ; MASK IT POP DE ; GET SET/RESET BIT OR E ; SET/RESET BIT SETBT0: RRCA ; ROTATE BIT IN CORRECT POSITION DJNZ SETBT0 LD (HL),A ; SAVE 8 BITS RET ; AND RETURN TO CALLER ; ; FILL BIT BUFFER FROM FCB IN DIRBUF ; ENTRY C=0 RESET BIT, C=1 SET BIT ; FILLBB: CALL CALDIR ; GET DIRECTORY ENTRY LD DE,16 ; GET OFFSET DM BLOCK ADD HL,DE ; ADD OFFSET LD B,E ; GET BLOCK COUNTER FILLB0: LD E,(HL) ; GET LSB BLOCK NUMBER INC HL ; INCREMENT POINTER LD D,0 ; RESET MSB BLOCK NUMBER LD A,(MAXLEN+1) ; TEST >256 BLOCKS PRESENT OR A JR Z,FILLB1 ; NO THEN JUMP DEC B ; DECREMENT BLOCK COUNTER LD D,(HL) ; GET CORRECT MSB INC HL ; INCREMENT POINTER FILLB1: LD A,D ; TEST BLOCK NUMBER OR E JR Z,FILLB2 ; ZERO THEN GET NEXT BLOCK PUSH HL ; SAVE POINTER PUSH BC ; SAVE COUNTER AND SET/RESET BIT LD HL,(MAXLEN) ; GET MAXIMUM LENGTH ALV BUFFER OR A ; RESET CARRY SBC HL,DE ; TEST DE<=MAXLEN ALV BUFFER CALL NC,SETBIT ; YES THEN INSERT BIT POP BC ; GET COUNTER AND SET/RESET BIT POP HL ; GET POINTER FILLB2: DJNZ FILLB0 ; REPEAT FOR ALL DM ENTRIES RET ; AND RETURN TO CALLER ; ; SET WRITE PROTECT DISK COMMAND ; CMND28: ; ; SET WRITE PROTECT DISK ; SETWPD: LD HL,(DSKRO) ; GET DISK R/O VECTOR CALL SDRVB ; INCLUDE DRIVE BIT LD (DSKRO),HL ; SAVE DISK R/O BIT SETFN: LD DE,(NFILES) ; GET MAXIMUM NUMBER OF FILES-1 INC DE ; INCREMENT IT LD HL,(TEMP0) ; GET POINTER TO DISK PARAMETER BLOCK LD (HL),E ; AND SAVE NUMBER OF FILES INC HL LD (HL),D RET ; AND RETURN TO CALLER ; ; CHECK FILE R/O BIT ; CHKFRO: CALL CALDIR ; GET DIRECTORY ENTRY CHKFR0: LD DE,2 ; OFFSET TO PUBLIC FILE BIT ADD HL,DE ; ADD OFFSET BIT 7,(HL) ; TEST PUBLIC FILE JR NZ,CHKFR1 ; YES THEN ERROR LD E,7 ; OFFSET TO FILE R/O BIT ADD HL,DE ; ADD OFFSET BIT 7,(HL) ; TEST FILE R/O JR NZ,CHKFR1 ; YES THEN ERROR ;system files should not be r/o for CP/M compatibility-B.H. ; INC HL ; INCREMENT TO SYSTEM FILE ; BIT 7,(HL) ; TEST SYSTEM FILE RET Z ; NO SYSTEM FILE THEN OK CHKFR1: LD HL,(SFILRO) ; GET POINTER TO FILE R/O MESSAGE JP (HL) ; DISPLAY MESSAGE ; ; CHECK DRIVE READ ONLY ; CHKRO: LD HL,(DSKRO) ; GET DRIVE R/O VECTOR CALL SDRVB ; SET DRIVE BIT SBC HL,DE ; TEST EXTRA BIT ADDED RET NZ ; YES THEN DRIVE NOT R/O LD HL,(STRO) ; GET POINTER TO DRIVE R/O MESSAGE JP (HL) ; DISPLAY MESSAGE ; ; GET FREE BLOCK FROM ALV BUFFER ; ENTRY DE=OLD BLOCK NUMBER ; EXIT DE=NEW BLOCK NUMBER (0 IF NO FREE BLOCK) ; HL COUNTS UP,DE COUNTS DOWN ; GETFRE: LD H,D ; COPY OLD BLOCK TO HL LD L,E GETFR0: LD A,D ; TEST DOWN COUNTER IS ZERO OR E JR Z,GETFR1 ; YES THEN JUMP DEC DE ; DECREMEMT DOWN COUNTER PUSH HL ; SAVE UP/DOWN COUNTER PUSH DE CALL GETBIT ; GET BIT FROM ALV BUFFER RRA ; TEST IF ZERO JR NC,GETFR3 ; YES THEN FOUND EMPTY BLOCK POP DE ; GET UP/DOWN COUNTER POP HL GETFR1: LD BC,(MAXLEN) ; GET MAXIMUM ALV LENGTH-1 IN BC OR A ; CLEAR CARRY SBC HL,BC ; TEST HL>=LENGTH ALV-1 ADD HL,BC ; RESTORE HL (FLAGS ARE NOT AFFECTED) JR NC,GETFR2 ; END BUFFER THEN JUMP INC HL ; INCREMENT UP COUNTER PUSH DE ; SAVE DOWN/UP COUNTER PUSH HL EX DE,HL ; SAVE UP COUNTER IN DE CALL GETBIT ; GET BIT FROM ALV BUFFER RRA ; TEST IF ZERO JR NC,GETFR3 ; YES THEN FOUND EMPTY BLOCK POP HL ; GET DOWN/UP COUNTER POP DE JR GETFR0 ; AND TEST NEXT BLOCK GETFR2: LD A,D ; TEST IF LAST BLOCK TESTED OR E JR NZ,GETFR0 ; NO THEN TEST NEXT BLOCK RET ; EXIT (DE=0) GETFR3: SCF ; SET BLOCK NUMBER USED RLA ; SAVE BIT CALL SETBT0 ; PUT BIT IN ALV BUFFER POP DE ; GET CORRECT COUNTER POP HL ; RESTORE STACK POINTER RET ; EXIT (DE=BLOCK NUMBER) ; ; SEARCH FOR FILE NAME ; ENTRY: A : NUMBER OF BYTES TO SEARCH FOR ; SEARCH: PUSH AF LD HL,DIFF ;Reset disk if it has changed XOR A CP (HL) JR Z,S1 CALL CLRDSK ;Clear disk changed flag S1: POP AF LD (SEARNB),A ; SAVE NUMBER OF BYTES LD A,0FFH ; SET EXIT CODE TO 0FFH (NOT FOUND) LD (SEAREX),A LD (DCOPY),IX ; COPY FCB POINTER TO RAM (SEARCH NEXT) CALL SETFCT ; INITIATE FILE COUNTER ;Mod 0.1 had a bug in which the directory of a changed disk would not be ;read. Adding CALL HOME forces a directory read--B.H. ; CALL HOME ; ; SEARCH NEXT FILE NAME ; SEARCN: XOR A ; CHECK CHECKSUM DIRECTORY CALL RDDIR ; GET FCB FROM DIRECTORY CALL TSTFCT ; TEST IF PAST LAST ENTRY JR Z,SEARC8 ; YES THEN JUMP LD DE,(DCOPY) ; GET FCB POINTER LD A,(DE) ; GET FIRST BYTE CP 0E5H ; TEST IF SEARCHING EMPTY DIRECTORY JR Z,SEARC1 ; YES THEN JUMP PUSH DE ; SAVE FCB POINTER CALL TSTLF ; TEST LAST FILE ON THIS DRIVE POP DE ; RESTORE FCB POINTER JR NC,SEARC8 ; YES THEN JUMP SEARC1: CALL CALDIR ; GET ENTRY IN DIRECTORY LD A,(HL) ; GET FIRST BYTE DIRECTORY ENTRY CP 021H ; TEST TIME STAMP JR Z,SEARCN ; YES THEN GET NEXT DIRECTORY ENTRY LD A,(SEARNB) ; GET NUMBER OF BYTES TO SEARCH FOR LD B,A ; SAVE IT IN COUNTER XOR A ; CLEAR ACCU LD (SEARQU),A ; CLEAR QUESTION MARK DETECTED FLAG LD (SEARPU),A ; CLEAR PUBLIC FILE FLAG LD C,A ; CLEAR COUNTER SEARC2: LD A,B ; TEST IF COUNTER IS ZERO OR A JR Z,SEARC9 ; YES THEN JUMP LD A,(DE) ; GET BYTE FROM FCB SUB '?' ; TEST IF QUESTION MARK JR Z,SEARC6 ; YES THEN JUMP LD A,C ; GET FCB COUNTER OR A ; TEST FIRST BYTE JR NZ,SEARC3 ; NO THEN JUMP LD A,(FLAGS) ; GET FLAG BYTE BIT 0,A ; TEST PUBLIC FILE ENABLE JR Z,SEARC3 ; NO THEN JUMP INC HL ; GET POINTER TO PUBLIC BIT INC HL BIT 7,(HL) ; TEST PUBLIC BIT DIRECTORY DEC HL ; RESTORE POINTER DEC HL JR Z,SEARC3 ; NO PUBLIC FILE THEN JUMP LD A,(DE) ; GET FIRST BYTE FCB CP 0E5H ; TEST IF SEARCHING EMPTY DIRECTORY JR Z,SEARC3 ; YES THEN JUMP XOR (HL) ; TEST FCB=DIRECTORY ENTRY AND 07FH ; MASK IT JR Z,SEARC5 ; YES THEN JUMP AND 0E0H ; MASK USER NUMBER JR NZ,SEARC3 ; NOT THE SAME THEN JUMP DEC A ; A=0FFH LD (SEARPU),A ; SET PUBLIC FILE FOUND JR SEARC5 ; JUMP FOUND SEARC3: LD A,C ; GET FCB COUNTER CP 13 ; TEST IF USER CODE JR Z,SEARC5 ; YES THEN NO TEST CP 12 ; TEST IF EXTENT NUMBER LD A,(DE) ; GET BYTE FROM FCB JR Z,SEARC7 ; JUMP IF EXTENT NUMBER XOR (HL) ; TEST BYTE FCB=BYTE DIRECTORY ENTRY AND 07FH ; MASK IT SEARC4: JR NZ,SEARCN ; NOT THE SAME THEN GET NEXT ENTRY SEARC5: INC DE ; INCREMENT POINTER FCB INC HL ; INCREMENT POINTER DIRECTORY ENTRY INC C ; INCREMENT COUNTER DEC B ; DECREMENT COUNTER JR SEARC2 ; TEST NEXT BYTE SEARC6: DEC A ; SET QUESTION MARK FOUND FLAG LD (SEARQU),A JR SEARC5 ; JUMP FOUND SEARC7: PUSH BC ; SAVE COUNTERS XOR (HL) ; TEST EXTENTS LD B,A ; SAVE IT LD A,(NEXTND) ; GET EXTENT MASK CPL ; COMPLEMENT IT AND 01FH ; MASK IT AND B ; MASK EXTENTS POP BC ; RETORE COUNTERS JR SEARC4 ; AND TEST RESULT SEARC8: CALL SETFCT ; ERROR SET FILE COUNTER LD A,0FFH ; AND SET EXIT CODE LD (PEXIT),A RET ; RETURN TO CALLER SEARC9: LD A,(SEARQU) ; GET QUESTION MARK FOUND FLAG LD B,A ; SAVE IT LD A,(SEARPU) ; GET PUBLIC FILE FLAG AND B ; TEST IF PUBLIC FILE AND QUESTION MARK JR NZ,SEARC4 ; YES THEN SEARCH FOR NEXT ENTRY CALL SETLF ; UPDATE LAST FILE COUNT (EMPTY FCB) LD A,(FILCNT) ; GET FILE COUNTER AND 3 ; MASK IT LD (PEXIT),A ; AND SET EXIT CODE XOR A ; CLEAR EXIT CODE SEARCH LD (SEAREX),A RET ; AND RETURN TO CALLER ; ;DELETE FILE ; DELETE: CALL CHKRO ; CHECK DISK R/O LD A,12 ; NUMBER OF BYTES TO SEARCH FOR CALL SEARCH ; SEARCH FILE DEL0: CALL TSTFCT ; TEST IF FILE FOUND RET Z ; NOT THEN EXIT CALL CHKFRO ; CHECK FILE R/O CALL CALDIR ; GET ENTRY POINT DIRECTORY LD (HL),0E5H ; REMOVE FILE LD C,0 ; REMOVE BITS ALV BUFFER CALL FILLBB CALL WRFCB1 ; WRITE DIRECTORY BUFFER ON DISK CALL SEARCN ; SEARCH NEXT ENTRY JR DEL0 ; AND TEST IT ; ; RENAME FILE ; RENAM: CALL CHKRO ; CHECK DISK R/O LD A,12 ; NUMBER OF BYTES TO SEARCH FOR CALL SEARCH ; SEARCH FILE RENAM0: CALL TSTFCT ; TEST IF FILE FOUND RET Z ; NOT THEN EXIT CALL CHKFRO ; CHECK FILE R/O LD BC,12*256+16 ; COPY FCB+16 TO DIRECTORY+0 12 TIMES CALL WRFCB ; AND WRITE DIRECTORY ON DISK CALL SEARCN ; SEARCH NEXT FILE JR RENAM0 ; AND TEST IT ; ; CHANGE STATUS FILE ; CSTAT: CALL CHKRO ; CHECK DISK R/O LD A,12 ; NUMBER OF BYTES TO SEARCH FOR CALL SEARCH ; SEARCH FILE CSTAT0: CALL TSTFCT ; TEST IF FILE FOUND RET Z ; NOT THEN EXIT LD BC,12*256+0 ; COPY FCB+0 TO DIRECTORY+0 12 TIMES CALL WRFCB ; AND WRITE DIRECTORY TO DISK CALL SEARCN ; SEARCH NEXT FILE JR CSTAT0 ; AND TEST IT ; ; COMPUTE FILE SIZE ; FILSZ: LD BC,0 ; RESET FILE SIZE LENGTH LD D,C CALL LDRRC ; SAVE IT IN FCB+33,34,35 LD A,12 ; NUMBER OF BYTES TO SEARCH FOR CALL SEARCH ; SEARCH FILE FILSZ0: CALL TSTFCT ; TEST IF FILE FOUND RET Z ; NOT THEN EXIT CALL CALDIR ; GET DIRECTORY ENTRY EX DE,HL ; COPY TO DE LD HL,15 ; OFFSET TO NEXT RECORD CALL CALRRC ; CALCULATE RANDOM RECORD COUNT LD A,D ; TEST LSB < (IX+33) SUB (IX+33) LD A,C ; TEST ISB < (IX+34) SBC A,(IX+34) LD A,B ; TEST MSB < (IX+35) SBC A,(IX+35) CALL NC,LDRRC ; WRITE NEW MAXIMUM CALL SEARCN ; SEARCH NEXT FILE JR FILSZ0 ; AND TEST IT ; ; WRITE FCB ON DISK ; WRFCB: CALL CALDIR ; GET DIRECTORY ENTRY PUSH HL ; SAVE POINTER LD A,(HL) ; GET USER CODE EX DE,HL ; COPY TO DE PUSH IX ; SAVE FCB ENTRY POP HL ; GET IT IN HL PUSH BC ; SAVE BC LD B,0 ; RESET B FOR ADD ADD HL,BC ; ADD OFFSET FCB POP BC ; RESTORE BC LD C,B ; GET NUMBER OF BYTES TO MOVE LD B,0 ; RESET B FOR LDIR LDIR ; MOVE BYTES POP HL ; GET POINTER USER CODE LD (HL),A ; RESTORE IT WRFCB1: CALL STDIR ; CALCULATE SECTOR/TRACK DIRECTORY JP WRITDR ; WRITE DIRECTORY ON DISK ; ; FIND FILE ; FINDF: LD A,15 ; NUMBER OF BYTES TO SEARCH FOR CALL SEARCH ; SEARCH FILE CALL TSTFCT ; TEST IF FILE PRESENT RET NZ ; YES THEN EXIT LD A,(RDWR) ; TEST IF WRITE FUNCTION OR A RET NZ ; YES THEN EXIT LD A,(SEARQU) ; TEST IF QUESTION MARK USED OR A RET NZ ; YES THEN EXIT LD HL,(PATH) ; GET PATH ADDRESS LD A,H ; TEST IF ZERO (NO PATH) OR L RET Z ; YES THEN EXIT FINDF0: LD A,(HL) ; GET FIRST ENTRY PATH NAME INC HL ; INCREMENT POINTER OR A ; TEST IF LAST ENTRY JP Z,SEARC8 ; YES THEN ERROR EXIT AND 07FH ; MASK DRIVE NUMBER CP '$' ; TEST IF CURRENT DRIVE JR NZ,FINDF1 ; NO THEN JUMP LD A,(DRIVE) ; GET CURRENT DRIVE INC A ; INCREMENT DRIVE NUMBER FINDF1: DEC A ; DECREMENT DRIVE NUMBER PUSH HL ; SAVE PATH POINTER CALL SELDK ; SELECT DRIVE POP HL ; RESTORE PATH POINTER LD A,(HL) ; GET USER NUMBER INC HL ; ADVANCE POINTER AND 07FH ; MASK USER NUMBER CP '$' ; TEST IF CURRENT USER JR NZ,FINDF2 ; NO THEN JUMP LD A,(USER) ; GET CURRENT USER FINDF2: AND 01FH ; MASK USER NUMBER LD B,A ; SAVE IT LD A,(IX+0) ; GET FCB BYTE 0 AND 0E0H ; REMOVE USER NUMBER OR B ; ADD NEW USER NUMBER LD (IX+0),A ; AND SAVE IT PUSH HL ; SAVE PATH POINTER LD A,15 ; SET NUMBER OF BYTES TO SEARCH FOR CALL SEARCH ; SEARCH FILE CALL TSTFCT ; TEST IF FILE PRESENT POP HL ; RESTORE PATH POINTER JR Z,FINDF0 ; NO THEN TEST NEXT PATH ENTRY PUSH HL ; SAVE PATH POINTER CALL CALDIR ; GET DIRECTORY ENTRY LD DE,10 ; ADD OFFSET SYSTEM BIT ADD HL,DE BIT 7,(HL) ; TEST SYSTEM FILE POP HL ; RESTORE PATH POINTER JR Z,FINDF0 ; NO SYSTEM FILE THEN TEST NEXT PATH ; ENTRY LD A,(DEFDRV) ; GET CURRENT DRIVE INC A ; INCREMENT DRIVE NUMBER LD (FCB0),A ; SAVE IT IN EXIT FCB0 RET ; AND RETURN TO CALLER ; ; OPEN FILE COMMAND ; CMND15: CALL SELDRV ; SELECT DRIVE FROM FCB LD (IX+14),0 ; CLEAR FCB+14 ; ; OPEN FILE ; OPENF: CALL FINDF ; FIND FILE (USE PATH NAME) CALL TSTFCT ; TEST FILE FOUND RET Z ; NO THEN EXIT OPENF0: LD A,(IX+12) ; GET EXTENT NUMBER FROM FCB PUSH AF ; SAVE IT CALL CALDIR ; GET DIRECTORY ENTRY PUSH IX ; SAVE FCB ENTRY POP DE ; GET IN IN DE LD BC,32 ; NUMBER OF BYTES TO MOVE LDIR ; MOVE DIRECTORY TO FCB SET 7,(IX+14) ; SET FCB/FILE NOT MODIFIED LD B,(IX+12) ; GET EXTENT NUMBER LD C,(IX+15) ; GET NEXT RECORD NUMBER POP AF ; GET OLD EXTENT NUMBER LD (IX+12),A ; SAVE IT CP B ; COMPARE OLD AND NEW EXTENT NUMBER JR Z,OPENF1 ; SAME THEN JUMP LD C,0 ; SET NEXT RECORD COUNT TO 0 JR NC,OPENF1 ; OLD EXTENT >= NEW EXTENT THEN JUMP LD C,80H ; SET NEXT RECORD COUNT TO MAXIMUM OPENF1: LD (IX+15),C ; SAVE NEXT RECORD COUNT RET ; AND RETURN TO CALLER ; ; CLOSE FILE COMMAND ; CMND16: CALL SELDRV ; SELECT DRIVE FROM FCB ; ; CLOSE FILE ; CLOSE: BIT 7,(IX+14) ; TEST FCB/FILE MODIFIED RET NZ ; NOT THEN NO CLOSE REQUIRED CALL CHKRO ; TEST DISK R/O LD A,15 ; NUMBER OF BYTES TO SEARCH FOR CALL SEARCH ; SEARCH FILE CALL TSTFCT ; TEST FILE PRESENT RET Z ; NO THEN EXIT CALL CHKFRO ; CHECK FILE R/O CALL CALDIR ; GET DIRECTORY ENTRY LD BC,16 ; OFFSET TO DM BLOCK ADD HL,BC ; ADD OFFSET EX DE,HL ; SAVE HL IN DE PUSH IX ; SAVE FCB POINTER POP HL ; GET IT IN HL ADD HL,BC ; ADD OFFSET LD A,(MAXLEN+1) ; TEST NUMBER OF BLOCK >= 256 OR A JR Z,CLOSE0 ; NO THEN JUMP DEC B ; SET FLAG CLOSE0: CALL COPYDM ; COPY AND TEST BLOCKS EX DE,HL ; EXCHANGE COPY DIRECTION CALL COPYDM ; COPY AND TEST BLOCKS EX DE,HL ; EXCHANGE COPY DIRECTION JR NZ,CLOSE4 ; BLOCK NOT THE SAME THEN ERROR INC HL ; INCREMENT POINTER FCB INC DE ; INCREMENT POINTER DIRECTORY BIT 0,B ; TEST NUMBER OF BLOCK >= 256 JR Z,CLOSE1 ; NO THEN JUMP INC HL ; INCREMENT POINTER FCB INC DE ; INCREMENT POINTER DIRECTORY DEC C ; DECREMENT COUNTER CLOSE1: DEC C ; DECREMENT COUNTER JR NZ,CLOSE0 ; NOT READY THEN JUMP LD HL,-20 ; ADD -20 TO GET EXTENT NUMBER ADD HL,DE ; HL CONTAINS POINTER TO EXTENT NUMBER LD A,(IX+12) ; GET EXTENT NUMBER FCB CP (HL) ; COMPARE WITH EXTENT NUMBER DIRECTORY JR C,CLOSE3 ; FCB < DIRECTORY THEN JUMP LD (HL),A ; SAVE EXTENT NUMBER IN DIRECTORY INC HL ; GET POINTER TO NEXT RECORD INC HL INC HL LD A,(IX+15) ; GET NEXT RECORD FCB ; ; THESE LINES HAVE TO BE REMOVED TO LET SUBMIT WORK CORRECTLY ; ; JR NZ,CLOSE2 ; EXTENTS NOT EQUAL THEN JUMP ; CP (HL) ; TEST FCB < DIRECTORY ; JR C,CLOSE3 ; IF SO THEN JUMP ; CLOSE2: LD (HL),A ; SAVE NEXT RECORD IN DIRECTORY CLOSE3: IF DOTIME LD E,5 ; SET LAST UPDATE DATE/TIME CALL STIME ; UPDATE TIME ENDIF JP WRFCB1 ; WRITE FCB ON DISK CLOSE4: LD A,0FFH ; FLAG ERROR LD (PEXIT),A RET ; AND RETURN TO CALLER ; ; COPY AND TEST DISK MAP ; ENTRY : HL : POINTER TO FIRST FCB ; DE : POINTER TO SECOND FCB ; B : 000H LESS THEN 256 BLOCKS ; 0FFH MORE OR EQUAL TO 256 BLOCKS ; EXIT : ZERO : 1 BLOCKS ARE THE SAME ; 0 BLOCKS ARE NOT THE SAME ; COPYDM: LD A,(HL) ; GET BYTE FIRST FCB BIT 0,B ; TEST NUMBER OF BLOCKS >=256 JR Z,COPYD0 ; NO THEN JUMP INC HL ; INCREMENT POINTER OR (HL) ; TEST BYTE =0 DEC HL ; DECREMENT POINTER COPYD0: OR A ; TEST BLOCK NUMBER IS ZERO JR NZ,COPYD1 ; NO THEN COMPARE BLOCKS LD A,(DE) ; COPY BLOCK FROM OTHER FCB IN EMPTY ; LOCATION LD (HL),A BIT 0,B ; TEST NUMBER OF BLOCKS >=256 RET Z ; NO THEN EXIT INC HL ; INCREMENT TO MSB BLOCK NUMBERS INC DE LD A,(DE) ; COPY BLOCK FROM OTHER FCB IN EMPTY ; LOCATION LD (HL),A JR COPYD2 ; JUMP TRICK TO SAVE SPACE COPYD1: LD A,(DE) ; GET BLOCK NUMBER FIRST FCB SUB (HL) ; TEST IF THE SAME RET NZ ; NOT THEN RETURN OR B ; TEST IF >=256 BLOCKS RET Z ; NO THEN RETURN INC HL ; INCREMENT TO MSB BLOCK NUMBERS INC DE COPYD2: LD A,(DE) ; GET BLOCK NUMBER FIRST FCB SUB (HL) ; TEST IF THE SAME DEC HL ; DECREMENT BLOCK FCB POINTERS DEC DE RET ; AND EXIT TO CALLER ; ; MAKE FILE COMMAND ; CMND22: CALL SELDRV ; SELECT DRIVE FROM FCB LD (IX+14),0 ; CLEAR FCB+14 ; ; MAKE FILE ; MAKE: CALL CHKRO ; CHECK DRIVE R/O LD A,(IX+0) ; GET FIRST BYTE FCB PUSH AF ; SAVE IT LD (IX+0),0E5H ; SET FIRST BYTE TO EMPTY FILE LD A,1 ; SEARCH FOR 1 BYTE CALL SEARCH ; SEARCH EMTY FILE POP AF ; GET FIRST BYTE FCB LD (IX+0),A ; RESTORE IT CALL TSTFCT ; TEST EMPTY FILE FOUND RET Z ; NO THEN RETURN ERROR XOR A ; CLEAR FCB+13 LD (IX+13),A PUSH IX ; SAVE FCB POINTER POP HL ; GET IT BACK IN HL LD DE,15 ; PREPARE OFFSET ADD HL,DE ; ADD IT LD B,17 ; SET LOOP COUNTER MAKE0: LD (HL),A ; CLEAR FCB+15 UNP TO FCB+31 INC HL ; INCREMENT POINTER DJNZ MAKE0 ; AND CLEAR ALL BYTES CALL CALDIR ; GET DIRECTORY ENTRY LD A,(IX+0) ; GET FIRST BYTE FCB LD (HL),A ; SAVE IT IN DIRECTORY (WRITE FCB ;NEEDS THIS) IF DOTIME LD E,1 ; SET CREATION DATE/TIME CALL STIME ; UPDATE TIME IN DIRECTORY LD E,5 ; SET LAST UPDATE DATE/TIME CALL STIME ; UPDATE TIME IN DIRECTORY ENDIF ; LD BC,32*256+0 ; COPY FCB+0 TO DIRECTOTY+0 32 TIMES CALL WRFCB ; WRITE FCB ON DISK SET 7,(IX+14) ; SET FCB/FILE NOT MODIFIED RET ; AND RETURN TO CALLER ; ; OPEN NEXT EXTENT ; OPENEX: BIT 7,(IX+14) ; TEST IF FCB/FILE MODIFIED (WRITE) JR NZ,OPENX2 ; NOT THEN JUMP CALL CLOSE ; CLOSE CURRENT FCB LD A,(PEXIT) ; GET EXIT CODE INC A ; TEST IF ERROR RET Z ; YES THEN EXIT CALL CALNEX ; CALCULATE NEXT EXTENT JR C,OPENX3 ; ERROR THEN JUMP JR NZ,OPENX5 ; FCB PRESENT FROM CLOSE THEN JUMP OPENX0: LD A,15 ; SEARCH FIRST 15 BYTES CALL SEARCH ; SEARCH FOR FILE OPENX1: CALL TSTFCT ; TEST IF FILE FOUND JR NZ,OPENX5 ; YES THEN JUMP LD A,(RDWR) ; TEST READ/WRITE FLAG OR A ; TEST IF READ JR Z,OPENX3 ; YES THEN ERROR CALL MAKE ; MAKE NEW EXTENT IF WRITE CALL TSTFCT ; TEST IF SUCCESFULL JR NZ,OPENX6 ; YES THEN EXIT JR OPENX3 ; NO THEN ERROR OPENX2: CALL CALNEX ; CALCULATE NEXT EXTENT JR C,OPENX3 ; ERROR THEN JUMP BIT 7,(IX+10) ; TEST SYSTEM FILE BIT JR Z,OPENX0 ; NO SYSTEM FILE THEN JUMP CALL FINDF ; SEARCH PATH FOR FILE JR OPENX1 ; USE SAME ROUTINE OPENX3: SET 7,(IX+14) ; SET FCB/FILE NOT MODIFIED LD A,0FFH ; SET EXIT CODE OPENX4: LD (PEXIT),A RET ; AND RETURN TO CALLER OPENX5: CALL OPENF0 ; OPEN FILE OPENX6: XOR A ; AND CLEAR EXIT CODE JR OPENX4 ; USE SAME ROUTINE ; ; CALCULATE NEXT EXTENT ; EXIT: CARRY=1 => OVERFLOW DETECTED ; ZERO =1 => SEARCH NEXT EXTENT ; ZERO =0 => NEXT EXTENT PRESENT (CLOSE) ; CALNEX: LD B,(IX+12) ; GET EXTENT NUMBER LD C,(IX+14) ; GET FCB+14 BIT 6,C ; TEST ERROR BIT RANDOM RECORD SCF ; SET ERROR FLAG RET NZ ; NON ZERO THEN ERROR EXIT INC B ; INCREMENT EXTENT NUMBER LD A,B ; GET EXTENT NUMBER AND 01FH ; MASK IT LD B,A ; SAVE IT IN B JR NZ,CALNX0 ; NON ZERO THEN JUMP INC C ; INCREMENT FCB+14 LD A,C ; GET IT IN A AND 03FH ; MASK IT LD C,A ; SAVE IT IN C SCF ; SET ERROR FLAG RET Z ; AND RETURN IF FILE OVERFLOW XOR A ; CLEAR ZERO FLAG (NOT SAME EXTENT) JR CALNX1 ; AND SAVE EXTENT NUMBER AND FCB+14 CALNX0: LD A,(NEXTND) ; GET NEXT EXTENT MASK AND B ; TEST IF SAME EXTENT (CLOSE) CALNX1: LD (IX+12),B ; SAVE EXTENT NUMBER LD (IX+14),C ; SAVE FCB+14 RET ; AND RETURN TO CALLER ; ; READ RANDOM RECORD COMMAND ; CMND33: CALL SELDRV ; SELECT DRIVE FROM FCB ; ; READ RANDOM SECTOR ; RDRAN: XOR A ; SET READ/WRITE FLAG CALL LDFCB ; LOAD RANDOM RECORD IN FCB JR Z,READS ; NO ERROR THEN READ SECTOR RET ; RETURN ERROR ; ; READ SEQUENTIAL ; CMND20: CALL SELDRV ; SELECT DRIVE FROM FCB ; ; READ SECTOR ; READS: XOR A ; SET READ/WRITE FLAG LD (RDWR),A ; SAVE IT LD A,(IX+32) ; GET RECORD COUNTER CP 080H ; TEST IF LAST RECORD THIS EXTENT JR NC,READS1 ; YES THEN OPEN NEXT EXTENT CP (IX+15) ; TEST IF GREATER THEN CURRENT RECORD JR C,READS2 ; NO THEN GET RECORD READS0: LD A,1 ; SET END OF FILE FLAG LD (PEXIT),A ; SAVE IT RET ; AND RETURN TO CALLER READS1: CALL OPENEX ; OPEN NEXT EXTENT LD A,(PEXIT) ; GET EXIT CODE OR A JR NZ,READS0 ; YES THEN END OF FILE LD (IX+32),0 ; CLEAR RECORD COUNTER READS2: CALL GETDM ; GET BLOCK NUMBER FROM DM IN FCB LD A,D ; TEST BLOCK NUMBER = 0 OR E JR Z,READS0 ; YES THEN END FILE CALL CALSEC ; CALCULATE SECTOR NUMBER (128 BYTES) CALL CALST ; CALCULATE SECTOR/TRACK NUMBER CALL READR ; READ DATA LD A,(FUNCT) ; GET FUNCTION NUMBER CP 20 ; TEST IF READ SEQUENTIAL RET NZ ; NO THEN RETURN INC (IX+32) ; INCREMENT NEXT RECORD COUNTER RET ; AND RETURN TO CALLER ; ; WRITE RANDOM SECTOR WITH ZERO FILL COMMAND ; CMND40: CALL SELDRV ; SELECT DRIVE FROM FCB ; ; WRITE RANDOM SECTOR WITH ZERO FILL ; WRRANZ: LD A,0FFH ; SET READ/WRITE FLAG CALL LDFCB ; LOAD FCB FROM RANDOM RECORD JR Z,WRITES ; NO ERROR THEN WRITE RECORD RET ; RETURN ERROR ; ; WRITE RANDOM RECORD COMMAND ; CMND34: CALL SELDRV ; SELECT DRIVE FROM FCB ; ; WRITE RANDOM SECTOR ; WRRAN: LD A,0FFH ; SET READ/WRITE FLAG CALL LDFCB ; LOAD FCB FROM RANDOM RECORD JR Z,WRITES ; NO ERROR THEN WRITE RECORD RET ; RETURN ERROR ; ; WRITE SEQUENTIAL ; CMND21: CALL SELDRV ; SELECT DRIVE FROM FCB ; ; WRITE SECTOR ; WRITES: LD A,0FFH ; SET READ/WRITE FLAG LD (RDWR),A ; AND SAVE IT CALL CHKRO ; CHECK DISK R/O PUSH IX ; SAVE FCB POINTER POP HL ; GET IT BACK IN HL CALL CHKFR0 ; CHECK FILE R/O LD A,(IX+32) ; GET RECORD COUNT CP 080H ; TEST IF END THIS EXTENT JR C,WRITS0 ; YES THEN OPEN NEXT EXTENT CALL OPENEX ; OPEN NEXT EXTENT LD A,(PEXIT) ; GET ERROR CODE OR A JP NZ,WRITS9 ; ERROR THEN DIRECTORY FULL ERROR LD (IX+32),0 ; CLEAR RECORD COUNTER WRITS0: CALL GETDM ; GET BLOCK NUMBER FROM FCB LD A,D ; TEST IF BLOCK NUMBER = 0 OR E JR NZ,WRITS5 ; NO THEN WRITE SECTOR PUSH HL ; SAVE POINTER TO BLOCK NUMBER LD A,C ; TEST FIRST BLOCK NUMBER IN EXTENT OR A JR Z,WRITS1 ; YES THEN JUMP DEC A ; DECREMENT POINTER TO BLOCK NUMBER CALL GETDM4 ; GET PREVIOUS BLOCKNUMBER WRITS1: CALL GETFRE ; GET NEAREST FREE BLOCK POP HL ; GET POINTER TO BLOCK NUMBER LD A,D ; TEST IF BLOCKNUMBER = 0 OR E JR Z,WRITS8 ; YES THEN DISK FULL ERROR RES 7,(IX+14) ; RESET FCB/FILE MODIFIED LD (HL),E ; SAVE BLOCKNUMBER LD A,(MAXLEN+1) ; GET NUMBER OF BLOCKS OR A ; TEST IF <256 JR Z,WRITS2 ; YES THEN JUMP INC HL ; INCREMENT TO MSB BLOCK NUMBER LD (HL),D ; SAVE MSB BLOCK NUMBER WRITS2: LD C,2 ; SET WRITE NEW BLOCK FLAG LD A,(FUNCT) ; GET FUNCTION NUMBER SUB 40 ; TEST IF WRITE RR WITH ZERO FILL JR NZ,WRITS6 ; NO THEN JUMP PUSH DE ; SAVE BLOCKNUMBER LD HL,DIRBUF ; USE DIRECTORY BUFFER FOR ZERO FILL LD B,128 ; 128 BYTES TO CLEAR WRITS3: LD (HL),A ; CLEAR DIRECTORY BUFFER INC HL ; INCREMENT POINTER DJNZ WRITS3 ; CLEAR ALL BYTES CALL CALSEC ; CALCULATE SECTOR NUMBER (128 BYTES) LD A,(NMASK) ; GET SECTOR MASK LD B,A ; COPY IT INC B ; INCREMENT IT TO GET NUMBER OF WRITES CPL ; COMPLEMENT SECTOR MASK AND E ; MASK SECTOR NUMBER LD E,A ; AND SAVE IT LD C,2 ; SET WRITE NEW BLOCK FLAG WRITS4: PUSH HL ; SAVE REGISTERS PUSH DE PUSH BC CALL CALST ; CALCULATE SECTOR/TRACK CALL DMADIR ; SET DMA DIRECTORY BUFFER POP BC ; GET WRITE NEW BLOCK FLAG PUSH BC ; SAVE IT AGAIN CALL WRITER ; WRITE RECORD ON DISK POP BC ; RESTORE REGISTERS POP DE POP HL LD C,0 ; CLEAR WRITE NEW BLOCK FLAG INC E ; INCREMENT SECTOR NUMBER DJNZ WRITS4 ; WRITE ALL BLOCKS CALL STDMA ; SET USER DMA ADDRESS POP DE ; GET BLOCK NUMBER WRITS5: LD C,0 ; CLEAR WRITE NEW BLOCK FLAG WRITS6: RES 7,(IX+14) ; RESET FCB/FILE MODIFIED FLAG PUSH BC ; SAVE IT CALL CALSEC ; CALCULATE SECTOR NUMBER (128 BYTES) CALL CALST ; CALCULATE SECTOR/TRACK POP BC ; GET WRITE NEW BLOCK FLAG CALL WRITER ; WRITE RECORD ON DISK LD A,(IX+32) ; GET RECORD COUNTER CP (IX+15) ; COMPARE WITH NEXT RECORD JR C,WRITS7 ; IF LESS THEN JUMP INC A ; INCREMENT RECORD COUNT LD (IX+15),A ; SAVE IT ON NEXT RECORD POSITION RES 7,(IX+14) ; RESET FCB/FILE MODIFIED FLAG WRITS7: LD A,(FUNCT) ; GET FUNCTION NUMBER CP 21 ; TEST WRITE SEQUENTIAL RET NZ ; NOT THEN RETURN INC (IX+32) ; INCREMENT RECORD COUNT RET ; AND RETURN TO CALLER WRITS8: LD A,2 ; SET DISK FULL ERROR LD (PEXIT),A RET ; AND RETURN TO CALLER WRITS9: LD A,1 ; SET DIRECTORY FULL FLAG LD (PEXIT),A RET ; AND RETURN TO CALLER ; ; LOAD FCB FOR RANDOM READ/WRITE ; EXIT : ZERO FLAG : 1 NO ERROR ; 0 ERROR OCCURED ; LDFCB: LD (RDWR),A ; SAVE READ/WRITE FLAG LD A,(IX+33) ; GET FIRST BYTE RANDOM RECORD LD D,A ; SAVE IT IN D RES 7,D ; RESET MSB TO GET NEXT RECORD RLA ; SHIFT MSB IN CARRY LD A,(IX+34) ; LOAD NEXT BYTE RANDOM RECORD RLA ; SHIFT CARRY PUSH AF ; SAVE IT AND 01FH ; MASK NEXT EXTENT LD C,A ; SAVE IT IN C POP AF ; GET BYTE RLA ; SHIFT 4 TIMES RLA RLA RLA AND 0FH ; MASK IT LD B,A ; SAVE FCB+14 LD A,(IX+35) ; GET NEXT BYTE RANDOM RECORD LD E,6 ; SET RANDOM RECORD TO LARGE FLAG CP 4 ; TEST RANDOM RECORD TO LARGE JR NC,LDFCB8 ; YES THEN ERROR RLCA ; SHIFT 4 TIMES RLCA RLCA RLCA ADD A,B ; ADD BYTE LD B,A ; SAVE FCB+14 IN B LD (IX+32),D ; SET NEXT RECORD COUNT LD D,(IX+14) ; GET FCB+14 BIT 6,D ; TEST ERROR RANDOM RECORD JR NZ,LDFCB0 ; YES THEN JUMP LD A,C ; GET NEW EXTENT NUMBER CP (IX+12) ; COMPARE WITH FCB JR NZ,LDFCB0 ; NOT EQUAL THEN OPEN NEXT EXTENT LD A,B ; GET NEW FCB+14 XOR (IX+14) ; COMPARE WITH FCB+14 AND 03FH ; MASK IT JR Z,LDFCB6 ; EQUAL THEN RETURN LDFCB0: BIT 7,D ; TEST FCB MODIFIED (WRITE) JR NZ,LDFCB1 ; NO THEN JUMP PUSH DE ; SAVE REGISTERS PUSH BC CALL CLOSE ; CLOSE EXTENT POP BC ; RESTORE REGISTERS POP DE LD E,3 ; SET CLOSE ERROR LD A,(PEXIT) ; GET EXIT CODE INC A JR Z,LDFCB7 ; ERROR THEN EXIT LDFCB1: LD (IX+12),C ; SAVE NEW EXTENT NUMBER LD (IX+14),B ; SAVE NEW FCB+14 BIT 7,D ; TEST FCB MODIFIED (PREVIOUS FCB) JR NZ,LDFCB3 ; NO THEN JUMP LDFCB2: LD A,15 ; SET NUMBER OF BYTES TO SEARCH FOR CALL SEARCH ; SEARCH NEXT FCB JR LDFCB4 ; JUMP LDFCB3: BIT 7,(IX+10) ; TEST IF SYSTEM FILE JR Z,LDFCB2 ; NO USE SEARCH CALL FINDF ; OPEN FILE (USE PATH NAME) LDFCB4: LD A,(PEXIT) ; GET ERROR CODE INC A JR NZ,LDFCB5 ; NO ERROR THEN EXIT LD A,(RDWR) ; GET READ/WRITE FLAG LD E,4 ; SET READ EMPTY RECORD INC A JR NZ,LDFCB7 ; READ THEN ERROR CALL MAKE ; MAKE MEW FCB LD E,5 ; SET MAKE ERROR LD A,(PEXIT) ; GET ERROR CODE INC A JR Z,LDFCB7 ; ERROR THEN EXIT JR LDFCB6 ; NO ERROR EXIT (ZERO SET) LDFCB5: CALL OPENF0 ; OPEN FILE LDFCB6: XOR A ; SET ZERO FLAG AND CLEAR ERROR CODE LD (PEXIT),A RET ; AND RETURN TO CALLER LDFCB7: LD (IX+14),0C0H ; SET RANDOM RECORD ERROR LDFCB8: LD A,E ; GET ERROR CODE LD (PEXIT),A ; AND SAVE IT SET 7,(IX+14) ; SET FCB/FILE NOT MODIFIED OR A ; CLEAR ZERO FLAG RET ; AND RETURN TO CALLER ; ; CALCULATE RANDOM RECORD ; ENTRY HL=OFFSET IN FCB ; DE=FCB POINTER ; EXIT D=LSB RANDOM RECORD ; C=ISB RANDOM RECORD ; B=MSB RANDOM RECORD ; CALRRC: ADD HL,DE ; POINTER TO FCB+15 OR FCB+32 LD A,(HL) ; GET BYTE LD HL,12 ; OFFSET TO EXTENT NUMBER ADD HL,DE ; GET POINTER TO EXTENT BYTE LD D,A ; SAVE FIRST BYTE LD A,(HL) ; GET EXTENT BYTE AND 01FH ; MASK IT RL D ; SHIFT MSB IN CARRY ADC A,0 ; ADD CARRY RRA ; SHIFT 1 TIME (16 BITS) RR D LD C,A ; SAVE ISB INC HL ; INCREMENT TO FCB+14 INC HL LD A,(HL) ; GET FCB+14 RRCA ; SHIFT 4 TIMES RRCA RRCA RRCA PUSH AF ; SAVE IT AND 03H ; MASK MSB LD B,A ; SAVE IT POP AF ; GET LSB AND 0F0H ; MASK IT ADD A,C ; ADD WITH ISB LD C,A ; SAVE ISB RET NC ; NO CARRY THEN RETURN INC B ; INCREMENT MSB RET ; AND RETURN TO CALLER ; CLRDSK: LD HL,0 ; Disk reset routine LD (LOGIN),HL CALL INITDR XOR A ;Clear disk changed flag LD (DIFF),A LD A,(SUBFLG) JP CMD25A ; ; SET TIME AND DATE ; ENTRY: E : 1 : SET CREATION TIME/DATE ; 5 : SET LAST UPDATE TIME/DATE ; TIME RETURN POINTER IN HL ; HL+0 : LOW BYTE DATE SINCE JAN,1,1978 ; HL+1 : HIGH BYTE DATE SINCE JAN,1,1978 ; HL+2 : HOURS (BCD) ; HL+3 : MINUTES (BCD) ; HL+4 : SECONDS (BCD) (NOT USED IN TIME STAMP) ; IF DOTIME STIME: LD HL,(DIRBUF) ; GET DIRECTORY ENTRY LD BC,060H ; OFFSET ENTRY POINT TIME/DATE STAMP ADD HL,BC ; ADD OFFSET LD A,(HL) ; GET BYTE SUB 021H ; TEST IF TIME STAMP PRESENT RET NZ ; NO THEN RETURN LD D,A ; CLEAR D ADD HL,DE ; ADD ENTRY (UPDATE/CREATE) LD A,(SECPNT) ; GET SECTOR POINTER RRCA ; SHIFT 2 TIMES RRCA LD E,A ; SAVE IT RRCA ; SHIFT 2 TIMES RRCA ADD A,E ; ADD IT (A=0,10,20) LD E,A ; SAVE IN E ADD HL,DE ; ADD OFFSET PUSH HL ; SAVE RESULT LD C,0 ; RETURN POINTER IN HL ; C=FF MEANS SET DATE POINTED TO BY HL CALL BTIME ; RETURN POINTER IN HL POP DE ; GET POINTER LD BC,4 ; SET 4 BYTES LDIR ; COPY 4 BYTES RET ; AND RETURN TO CALLER ; ; GET TIME ; GETTIM: PUSH DE ; SAVE ADDRESS TO PUT TIME LD C,0 ; GET TIME ADDRESS CALL BTIME ; EXECUTE P2BIOS CALL POP DE ; RESTORE ADDRESS TO PUT TIME LD BC,5 ; 5 BYTES TO MOVE LDIR ; STORE THE TIME RET ; AND RETURN TO CALLER ; ; SET TIME ; SETTIM: EX DE,HL ; GET ADDRESS TIME IN HL LD C,0FFH ; SET TIME ADDRESS ; AND FALL THROUGH TO P2BIOS CALL ; ; EXECUTE P2BIOS TIME ROUTINE ; BTIME: PUSH HL ; SAVE VALUE IN HL LD HL,(TIMEAD) ; GET ADDRESS TIME ROUTINE EX (SP),HL ; PUT ADDRESS ON STACK AND RESTORE HL RET ; EXECUTE TIME ROUTINE ; ENDIF ; ; P2DOS EXIT ROUTINE ; P2EXIT: LD A,(FLDRV) ; TEST DRIVE SELECT USED FLAG OR A JR Z,P2EXT0 ; NO THEN EXIT LD A,(FCB0) ; GET FCB BYTE 0 LD (IX+0),A ; SAVE IT LD A,(DRIVE) ; GET OLD DRIVE NUMBER CALL SELDK ; SELECT DISK P2EXT0: PUSH IX ; SAVE IX POP DE ; RESTORE DE POP IX ; RESTORE IX LD SP,(SPSAVE) ; GET OLD SP LD HL,(PEXIT) ; GET EXIT CODE LD A,(FUNCT) ; GET FUNCTION CODE LD C,A ; RESTORE C LD A,L ; COPY FUNCTION CODE LD B,H RET ; AND RETURN TO CALLER ; ; RAM AREA ; TABCNT: DB 0 ; TAB COUNTER TABCX1: DB 0 ; TEMPORARY TAB COUNTER (USED BY RDBUF) FCONTP: DB 0 ; LIST ENABLE FLAG (CONTROL P) LASTCH: DB 0 ; LAST CHARACTER DELAY: DB 0FFH ; DELAY COUNTER ; TRANS: DEFW 0 ; TRANSLATION VECTOR TEMP0: DEFW 0 ; NUMBER OF FILES ON DRIVE TEMP1: DEFW 0 ; NOT USED TEMP2: DEFW 0 ; NOT USED DIRBUF: DEFW 0 ; DIRECTORY BUFFER IXP: DEFW 0 ; DISK PARAMETER BLOCK CSV: DEFW 0 ; CHECK SUM POINTER ALV: DEFW 0 ; ALLOCATION VECTOR POINTER ; MAXSEC: DEFW 0 ; MAXIMUM NUMBER OF SECTORS/TRACK NBLOCK: DB 0 ; NUMBER OF BLOCKS NMASK: DB 0 ; MASK NUMBER OF BLOCKS NEXTND: DB 0 ; EXTENT MASK MAXLEN: DEFW 0 ; MAXIMUM BLOCK NUMBER-1 NFILES: DEFW 0 ; MAXIMUM NUMBER OF FILES-1 NDIR0: DB 0 ; FIRST TWO ENTRIES ALV BUFFER NDIR1: DB 0 NCHECK: DEFW 0 ; NUMBER OF CHECKSUM ENTRUIES NFTRK: DEFW 0 ; FIRST TRACK NUMBER ; DSKRO: DEFW 0 ; DISK R/O VECTOR LOGIN: DEFW 0 ; LOGIN VECTOR DMA: DEFW 080H ; DMA ADDRESS ; FUNCT: DB 0 ; FUNCTION NUMBER PEXIT: DEFW 0 ; EXIT CODE FLDRV: DB 0 ; DRIVE SELECT USED FLAG RDWR: DB 0 ; READ/WRITE FLAG ; FCB0: DB 0 ; FCB BYTE 0 USER: DB 0 ; USER NUMBER DRIVE: DB 0 ; DRIVE NUMBER DEFDRV: DB 0 ; DEFAULT DRIVE NUMBER RECDIR: DEFW 0 ; RECORD DIRECTORY (CHECKSUM) FILCNT: DEFW 0 ; FILE COUNTER SECPNT: DB 0 ; SECTOR POINTER SUBFLG: DB 0 ; SUBMIT FLAG (RESET DISK COMMAND) ; DCOPY: DEFW 0 ; COPY ADDRESS FCB SEAREX: DB 0 ; EXIT CODE SEARCH SEARNB: DB 0 ; SEARCH NUMBER OF BYTES SEARQU: DB 0 ; SEARCH QUESTION MARK USED SEARPU: DB 0 ; SEARCH PUBLIC FILE ;next two flags added by B.H. DIFF: DB 0 ; disk changed flag RETFLG: DB 0 ; allows recovery from read/write errors ; SPSAVE: DEFW 0 ; STACK POINTER LOCATION DEFS 62 ; 62 BYTE STACK P2DOSS: ; P2DOS STACK DOSSTOP EQU $ ; IF ((DOSSTOP-DOSSTRT) GT 3584) *Bdos too large!!* ENDIF ;