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https://github.com/bobbimanners/Zapple-II.git
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Debugged OPEN,READ,WRITE,CLOSE,DELETE functions.
This commit is contained in:
Bobbi Webber-Manners
parent
c2de569629
commit
df75606612
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@ -156,7 +156,12 @@ S1 LD C,B_C_STAT ;
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CALL CHECKOK
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; Write to the file (two 128 byte records)
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; Set the DMA buffer to point to our text
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LD DE,TEXTBUF ;
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LD C,B_F_DMAOFF ;
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CALL BDOS ;
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; Write to the file
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LD DE,WMSG ; Address of string
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LD C,B_C_WRTSTR ;
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@ -174,6 +179,30 @@ S1 LD C,B_C_STAT ;
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CALL CHECKOK
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LD DE,FCB1 ; Default FCB address
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LD C,B_F_WRITE ;
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CALL BDOS ;
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CALL CHECKOK
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LD DE,FCB1 ; Default FCB address
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LD C,B_F_WRITE ;
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CALL BDOS ;
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CALL CHECKOK
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LD DE,FCB1 ; Default FCB address
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LD C,B_F_WRITE ;
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CALL BDOS ;
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CALL CHECKOK
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LD DE,FCB1 ; Default FCB address
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LD C,B_F_WRITE ;
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CALL BDOS ;
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CALL CHECKOK
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; Close the file
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LD DE,CLMSG ; Address of string
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@ -186,6 +215,15 @@ S1 LD C,B_C_STAT ;
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CALL CHECKOK
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; Overwrite DMA buffer just to be sure it is read
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LD A,'X' ;
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LD HL,(DMAADDR) ;
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LD (HL),A ;
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INC HL
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LD (HL),A ;
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INC HL
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LD (HL),A ;
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; Open the file
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LD DE,OMSG ; Address of string
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@ -210,6 +248,11 @@ S1 LD C,B_C_STAT ;
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CALL CHECKOK
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; Print out what we just read
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LD DE,(DMAADDR) ;
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LD C,B_C_WRTSTR ;
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CALL BDOS ;
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; Close the file
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LD DE,CLMSG ; Address of string
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@ -245,10 +288,12 @@ L2 LD C,B_C_READ ;
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; Check an MLI call was successful and print out message accordingly
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CHECKOK LD A,(AREG) ; Look at the return code
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CP 0 ; Success?
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JP Z,SUCC ;
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JP Z,COKS1 ;
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PUSH AF ; Preserve A
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LD DE,FAILMSG1 ; Fail message
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LD C,B_C_WRTSTR ;
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CALL BDOS ;
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POP AF ; Restore A
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LD L,A ; Copy to HL for NUM2HEX
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LD H,0 ; ...
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LD DE,HEXBUF ; Generate hex string to HEXBUF
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@ -262,7 +307,7 @@ CHECKOK LD A,(AREG) ; Look at the return code
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LD C,B_C_WRTSTR ;
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CALL BDOS ;
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RET ;
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SUCC LD DE,SUCCMSG ; Success message
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COKS1 LD DE,SUCCMSG ; Success message
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LD C,B_C_WRTSTR ;
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CALL BDOS ;
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RET
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@ -302,7 +347,10 @@ FAILMSG1 DEFM 'FAIL (0x$'
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FAILMSG2 DEFM ')'
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DEFB 13, '$'
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TEXTBUF DEFM 'Mary had a little lamb. Its fleece was white as snow. '
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DEFM 'And everywhere that Mary went, that lamb was sure to go.$'
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Implementation of CP/M STYLE BDOS
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; Function to invoke is passed in C, as follows:
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@ -517,6 +565,8 @@ DSRET LD L,A ; Return code in L too
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; 0 through 3 for success, 0FFH is file not found
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F_OPEN CALL MAKEPATH ; Populate PATHLEN and PATH
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PUSH DE ; Preserve pointer to FCB
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; Work out which IOBUF to allocate for this file
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LD A,0 ; Looking for FRN slot with value 0
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CALL GETIOADDR ; Returns FRN slot in A, IOBUF in HL
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@ -528,14 +578,14 @@ F_OPEN CALL MAKEPATH ; Populate PATHLEN and PATH
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ADD HL,BC ; ...
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LD (FOMLII),HL ; Store in parameter list
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PUSH DE ; Preserve pointer to FCB
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LD HL,FOMLI ; Pass address of 6502 JSR instruction
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CALL PRODOS ; Invoke ProDOS MLI
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POP DE ; Restore pointer to FCB
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CP 0 ; See if there was an error
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JP NZ,FOERR ; Handle error
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POP DE ; Restore pointer to FCB
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; Store ProDOS FRN in S2 field of FCB
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LD A,(FOMLIN) ; Get ProDOS file reference number
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LD H,D ; Pointer to FCB ...
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@ -557,7 +607,8 @@ F_OPEN CALL MAKEPATH ; Populate PATHLEN and PATH
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LD L,A ; Copy to L
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RET ; Done
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FOERR LD A,0FFH ; Error return status
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FOERR POP DE ; Restore the stack
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LD A,0FFH ; Error return status
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LD L,A ; Copy to L
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RET ; Done (error)
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@ -566,7 +617,7 @@ FOMLI DEFB 20H,00H,0BFH ; JSR $BF00 in 6502 code
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DEFW FOMLIPL+OFFSET ; Pointer to parm list in 6502 addr space
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DEFB 60H ; RTS in 6502 code
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FOMLIPL DEFB 3 ; ProDOS PL: Three parameters
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FOMLIP DEFW PATHLEN+OFFSET ; ProDOS PL: pointer to path in 6502 addr
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FOMLIP DEFW PATHBUF+OFFSET ; ProDOS PL: pointer to path in 6502 addr
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FOMLII DEFW 0000H ; ProDOS PL: pointer to IO buffer
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FOMLIN DEFB 0 ; ProDOS PL: File reference number
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@ -586,12 +637,21 @@ F_CLOSE LD H,D ; Pointer to FCB ...
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CP 0 ; See if there was an error
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JP NZ,FCERR ; Handle error
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;
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; TODO - SET THE APPROPRIATE FRN[1234] TO ZERO TO FREE BUFFER
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;
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LD A,(FCMLIN) ; Obtain file reference number again
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CALL GETIOADDR ; Returns FRN slot in A, IOBUF in HL
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CP 0FFH ; Check for error
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JP Z,FCERR ; If FRN not found, error out
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LD HL,FRN1-1 ; Compute addr of FRN slot to set to zero
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LD B,0 ; ...
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LD C,A ; ...
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ADD HL,BC ; ...
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LD A,0 ; And zero it
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LD (HL),A ; ...
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LD A,0 ; Return zero for error
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LD L,A ; Return in L also
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RET
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FCERR LD A,0FFH ; 0FFH for error
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LD L,A ; Return code in L also
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RET
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@ -622,7 +682,7 @@ FDMLI DEFB 20H,00H,0BFH ; JSR $BF00 in 6502 code
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DEFW FDMLIPL+OFFSET ; Pointer to parm list in 6502 addr space
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DEFB 60H ; RTS in 6502 code
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FDMLIPL DEFB 1 ; ProDOS PL: Seven parameters
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FDMLIP DEFW PATHLEN+OFFSET ; ProDOS PL: Pointer to path in 6502 addr
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FDMLIP DEFW PATHBUF+OFFSET ; ProDOS PL: Pointer to path in 6502 addr
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; Read next record
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; DE is the address of the FCB describing the file from which to read
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@ -634,9 +694,12 @@ F_READ LD H,D ; Pointer to FCB ...
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ADD HL,BC ; Compute address
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LD A,(HL) ; Obtain file reference num from FCB S2
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LD (FRMLIN),A ; Store in parameter list
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CALL GETIOADDR ; Get I/O address
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CP 0FFH ; See if it was an error
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JP Z,FRERR ; If so, abort
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; CALL GETIOADDR ; Get I/O address
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; CP 0FFH ; See if it was an error
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; JP Z,FRERR ; If so, abort
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LD HL,(DMAADDR) ; Read from DMA buffer address
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LD BC,OFFSET ; Convert to 6502 address
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ADD HL,BC ; ...
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LD (FRMLIDB),HL ; Store I/O buffer address in parm list
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@ -644,6 +707,7 @@ F_READ LD H,D ; Pointer to FCB ...
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CALL PRODOS ; Invoke ProDOS MLI
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CP 0 ; See if there was an error
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JP NZ,FRERR ; Handle error
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LD A,0 ; Zero for success
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LD L,A ; Return code in L also
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RET ; Done
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FRERR LD A,0FFH ; TODO: All errors are 0FFH for now
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@ -670,25 +734,21 @@ F_WRITE LD H,D ; Pointer to FCB ...
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ADD HL,BC ; Compute address
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LD A,(HL) ; Obtain file reference num from FCB S2
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LD (FWMLIN),A ; Store in parameter list
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CALL GETIOADDR ; Get I/O address
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CP 0FFH ; See if it was an error
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JP Z,FWERR ; If so, abort
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; CALL GETIOADDR ; Get I/O address
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; CP 0FFH ; See if it was an error
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; JP Z,FWERR ; If so, abort
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LD HL,(DMAADDR) ; Write to DMA address
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LD BC,OFFSET ; Convert to 6502 address
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ADD HL,BC ; ...
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LD (FWMLIDB),HL ; Store I/O buffer address in parm list
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; DEBUG -------------------------------------------
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; LD DE,HEXBUF ; Generate hex string to HEXBUF
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; CALL NUM2HEX ; ...
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; LD DE,HEXBUF ; Write hex value to console
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; LD C,B_C_WRTSTR ;
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; CALL BDOS
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; END DEBUG ---------------------------------------
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LD HL,FWMLI ; Pass address of 6502 JSR instruction
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CALL PRODOS ; Invoke ProDOS MLI
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CP 0 ; See if there was an error
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JP NZ,FWERR ; Handle error
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LD A,0 ; Zero for success
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LD L,A ; Return code in L also
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RET ; Done
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FWERR LD A,0FFH ; TODO: All errors are 0FFH for now
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@ -715,7 +775,7 @@ F_MAKE CALL MAKEPATH ; Populate PATHLEN and PATH
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CP 0 ; See if there was an error
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JP NZ,FMERR ; Handle error
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CALL F_OPEN ; Open the file using same FCB (DE ptr)
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RET
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RET ; Return with status from F_OPEN
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FMERR LD A,0FFH ; 0FFH for error
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LD L,A ; Return code in L also
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RET
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@ -725,7 +785,7 @@ FMMLI DEFB 20H,00H,0BFH ; JSR $BF00 in 6502 code
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DEFW FMMLIPL+OFFSET ; Pointer to parm list in 6502 addr space
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DEFB 60H ; RTS in 6502 code
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FMMLIPL DEFB 7 ; ProDOS PL: Seven parameters
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FMMLIP DEFW PATHLEN+OFFSET ; ProDOS PL: Pointer to path in 6502 addr
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FMMLIP DEFW PATHBUF+OFFSET ; ProDOS PL: Pointer to path in 6502 addr
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FMMLIA DEFB 0C3H ; ProDOS PL: Access (0C3H full access)
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FMMLIT DEFB 0 ; ProDOS PL: File type (0 means typeless)
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FMMLIAT DEFW 0000H ; ProDOS PL: Aux file type (always 0000H)
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@ -813,7 +873,7 @@ PRODOS LD BC,OFFSET ; Add offset to convert Z80->6502 address
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; Populate the PATH buffer (and PATHLEN) by copying from FCB
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; DE contains a pointer to the FCB
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; Be sure not to trash DE
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; TODO FINISH THIS!!!
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; TODO FINISH THIS - NEEDS TO HANDLE EXTENSION TOO!!!
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MAKEPATH LD A,(DE) ; Get drive number from FCB
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CP 0 ; See if it is zero (default drive)
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JP NZ,MPS1 ; If drive explicit
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@ -854,7 +914,7 @@ MPS3 ; EXTENSION
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; If found, return FRN slot# 1,2,3,4 in A, I/O buffer address in HL
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; If not found, return A=0FFH
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; Trashes B
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GETIOADDR LD B,A ; Stash A
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GETIOADDR LD B,A ; Stash file ref number into B
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LD A,(FRN1) ; Does it match FRN1?
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CP B ; ...
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JP Z,GIOAS1 ; ...
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@ -864,9 +924,9 @@ GETIOADDR LD B,A ; Stash A
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LD A,(FRN3) ; Does it match FRN3?
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CP B ; ...
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JP Z,GIOAS3 ; ...
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LD A,(FRN3) ; Does it match FRN4?
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LD A,(FRN4) ; Does it match FRN4?
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CP B ; ...
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JP Z,GIOAS3 ; ...
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JP Z,GIOAS4 ; ...
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LD A,0FFH ; No match, return A=0FFH
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RET ; ...
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GIOAS1 LD HL,IOBUF1 ; Address of I/O buf 1 -> HL
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@ -910,6 +970,7 @@ N2H2 OR 0F0H ;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; 64 bytes for storing a file path as a Pascal style string
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PATHBUF
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PATHLEN DEFB 0
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PATH DEFS 64
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@ -933,13 +994,13 @@ HEXBUF DEFB 0,0,0,0,'$'
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; IOBUF4 $B700-$BAFF
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ORG 7000H ; Set to 7000H by experiment ...
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IOBUF1 DEFM 'Mary had a little lamb'
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IOBUF1 DEFS 1024
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ORG 7400H
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IOBUF2 DEFM 'His fleece was white as snow'
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IOBUF2 DEFS 1024
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ORG 7800H
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IOBUF3 DEFM 'And everywhere that Mary went'
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IOBUF3 DEFS 1024
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ORG 7C00H
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IOBUF4 DEFM 'That sheep was sure to go'
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IOBUF4 DEFS 1024
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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