Applecorn/mainmem.misc.s

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4.8 KiB
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* MAINMEM.MISC.S
* (c) Bobbi 2021 GPLv3
*
* Miscellaneous routines used by main memory code.
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* Copy a block of main memory
* A1L/A1H: Start address
* A2L/A2H: End address
* A4L/A4H: Destination start address
MEMCPY LDA (A1L)
STA (A4L)
LDA A1H
CMP A2H
BNE :S1
LDA A1L
CMP A2L
BNE :S1
BRA :DONE
:S1 INC A1L
BNE :S2
INC A1H
:S2 INC A4L
BNE :S3
INC A4H
:S3 BRA MEMCPY
:DONE RTS
* Copy 512 bytes from BLKBUF to AUXBLK in aux LC
COPYAUXBLK >>> ALTZP ; Alt ZP & Alt LC on
LDY #$00
:L1 LDA BLKBUF,Y
STA $C005 ; Write aux mem
STA AUXBLK,Y
STA $C004 ; Write main mem
CPY #$FF
BEQ :S1
INY
BRA :L1
:S1 LDY #$00
:L2 LDA BLKBUF+$100,Y
STA $C005 ; Write aux mem
STA AUXBLK+$100,Y
STA $C004 ; Write main mem
CPY #$FF
BEQ :S2
INY
BRA :L2
:S2 >>> MAINZP ; Alt ZP off, ROM back in
RTS
* Search FILEREFS for value in A
* On return, buffer number is in X (or $FF if no bufs)
FINDBUF LDX #$00
:L1 CMP FILEREFS,X
BEQ :END
INX
CPX #$04
BNE :L1
LDX #$FF ; $FF for not found
:END RTS
* Obtain I/O buffer address
* On entry: buffer number in X
* On exit: buffer address in AY
* Carry set if no bufs, clear otherwise
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BUFADDR CPX #$00
BNE :S1
LDA #<IOBUF1
LDY #>IOBUF1
BRA :EXIT
:S1 CPX #$01
BNE :S2
LDA #<IOBUF2
LDY #>IOBUF2
BRA :EXIT
:S2 CPX #$02
BNE :S3
LDA #<IOBUF3
LDY #>IOBUF3
BRA :EXIT
:S3 CPX #$03
BNE :NOBUFS
LDA #<IOBUF4
LDY #>IOBUF4
:EXIT CLC
RTS
:NOBUFS SEC
RTS
* Check if file exists
* Return A=0 if doesn't exist, A=1 file, A=2 dir
EXISTS LDA #<MOSFILE
STA GINFOPL+1
LDA #>MOSFILE
STA GINFOPL+2
JSR GETINFO ; GET_FILE_INFO
BCS :NOEXIST
LDA GINFOPL+7 ; Storage type
CMP #$0D
BCS :DIR ; >= $0D
LDA #$01 ; File
RTS
:DIR LDA #$02
RTS
:NOEXIST LDA #$00
RTS
* Copy FILEBLK to AUXBLK in aux memory
* Preserves A
COPYFB PHA
LDX #$00
:L1 LDA FILEBLK,X
TAY
>>> ALTZP ; Alt ZP and LC
TYA
STA AUXBLK,X
>>> MAINZP ; Back to normal
INX
CPX #18 ; 18 bytes in FILEBLK
BNE :L1
PLA
RTS
* Get file info
GETINFO JSR MLI
DB GINFOCMD
DW GINFOPL
RTS
* Set file info
SETINFO LDA #$07 ; SET_FILE_INFO 7 parms
STA GINFOPL
JSR MLI
DB SINFOCMD
DW GINFOPL ; Re-use PL from GFI
LDA #$0A ; GET_FILE_INFO 10 parms
STA GINFOPL
RTS
* Create disk file
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* Uses filename in MOSFILE
CRTFILE JSR MLI ; GET_TIME
DB GTIMECMD
LDA #<MOSFILE
STA CREATEPL+1
LDA #>MOSFILE
STA CREATEPL+2
LDA #$C3 ; Open permissions
STA CREATEPL+3
LDA $BF90 ; Current date
STA CREATEPL+8
LDA $BF91
STA CREATEPL+9
LDA $BF92 ; Current time
STA CREATEPL+10
LDA $BF93
STA CREATEPL+11
JSR MLI
DB CREATCMD
DW CREATEPL
RTS
* Open disk file
OPENFILE JSR MLI
DB OPENCMD
DW OPENPL
RTS
* Close disk file
CLSFILE JSR MLI
DB CLSCMD
DW CLSPL
RTS
* Read 512 bytes into BLKBUF
RDFILE JSR MLI
DB READCMD
DW READPL
RTS
* Write data in BLKBUF to disk
WRTFILE JSR MLI
DB WRITECMD
DW WRITEPL
RTS
* Put ProDOS prefix in PREFIX
GETPREF JSR MLI
DB GPFXCMD
DW GPFXPL
RTS
* Map of file reference numbers to IOBUF1..4
FILEREFS DB $00,$00,$00,$00
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