mirror of
https://github.com/bobbimanners/Applecorn.git
synced 2024-11-15 19:07:03 +00:00
786 lines
24 KiB
ArmAsm
786 lines
24 KiB
ArmAsm
* MAINMEM.S
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* (c) Bobbi 2021 GPL v3
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*
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* Code that runs on the Apple //e in main memory.
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* This code is mostly glue between the BBC Micro code
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* which runs in aux mem and Apple II ProDOS.
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* ProDOS MLI command numbers
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QUITCMD EQU $65
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GTIMECMD EQU $82
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CREATCMD EQU $C0
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DESTCMD EQU $C1
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SFILECMD EQU $C3
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GINFOCMD EQU $C4
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ONLNCMD EQU $C5
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SPFXCMD EQU $C6
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GPFXCMD EQU $C7
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OPENCMD EQU $C8
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READCMD EQU $CA
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WRITECMD EQU $CB
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CLSCMD EQU $CC
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FLSHCMD EQU $CD
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SMARKCMD EQU $CE
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GMARKCMD EQU $CF
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GEOFCMD EQU $D1
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* Trampoline in main memory used by aux memory IRQ handler
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* to invoke Apple II / ProDOS IRQs in main memory
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A2IRQ >>> IENTMAIN ; IENTMAIN does not do CLI
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JSR A2IRQ2
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>>> XF2AUX,IRQBRKRET
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A2IRQ2 PHP ; Fake things to look like IRQ
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JMP (A2IRQV) ; Call Apple II ProDOS ISR
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* BRK handler in main memory. Used on Apple IIgs only.
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GSBRK >>> XF2AUX,GSBRKAUX
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* Set prefix if not already set
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SETPRFX LDA #GPFXCMD
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STA :OPC7 ; Initialize cmd byte to $C7
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:L1 JSR MLI
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:OPC7 DB $00
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DW GSPFXPL
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LDX $0300
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BNE RTSINST
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LDA $BF30
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STA ONLPL+1 ; Device number
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JSR MLI
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DB ONLNCMD
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DW ONLPL
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LDA $0301
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AND #$0F
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TAX
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INX
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STX $0300
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LDA #$2F
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STA $0301
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DEC :OPC7
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BNE :L1
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RTSINST RTS
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* Disconnect /RAM ramdrive to avoid aux corruption
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* Stolen from Beagle Bros Extra K
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DISCONN LDA $BF98
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AND #$30
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CMP #$30
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BNE :S1
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LDA $BF26
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CMP $BF10
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BNE :S2
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LDA $BF27
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CMP $BF11
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BEQ :S1
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:S2 LDY $BF31
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:L1 LDA $BF32,Y
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AND #$F3
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CMP #$B3
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BEQ :S3
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DEY
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BPL :L1
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BMI :S1
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:S3 LDA $BF32,Y
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STA $0302
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:L2 LDA $BF33,Y
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STA $BF32,Y
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BEQ :S4
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INY
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BNE :L2
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:S4 LDA $BF26
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STA $0300
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LDA $BF27
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STA $0301
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LDA $BF10
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STA $BF26
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LDA $BF11
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STA $BF27
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DEC $BF31
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:S1 RTS
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* Reset handler - invoked on Ctrl-Reset
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* XFER to AUXMOS ($C000) in aux, AuxZP on, LC on
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RESET TSX
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STX $0100
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LDA $C058 ; AN0 off
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LDA $C05A ; AN1 off
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LDA $C05D ; AN2 on
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LDA $C05F ; AN3 on
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LDA #$20 ; PAGE2 shadow on ROM3 GS
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TRB $C035
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>>> XF2AUX,AUXMOS
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RTS
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* Copy 512 bytes from BLKBUF to AUXBLK in aux LC
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COPYAUXBLK
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SEI
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>>> ALTZP ; Alt ZP & Alt LC on
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LDY #$00
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:L1 LDA BLKBUF,Y
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STA $C005 ; Write aux mem
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STA AUXBLK,Y
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STA $C004 ; Write main mem
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CPY #$FF
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BEQ :S1
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INY
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BRA :L1
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:S1 LDY #$00
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:L2 LDA BLKBUF+$100,Y
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STA $C005 ; Write aux mem
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STA AUXBLK+$100,Y
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STA $C004 ; Write main mem
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CPY #$FF
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BEQ :S2
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INY
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BRA :L2
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:S2 >>> MAINZP ; Alt ZP off, ROM back in
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CLI
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RTS
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* ProDOS file handling for MOS OSFIND OPEN call
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* Options in A: $40 'r', $80 'w', $C0 'rw'
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OFILE >>> ENTMAIN
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PHA ; Preserve arg for later
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CMP #$80 ; Write mode
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BNE :S0
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LDA #<MOSFILE ; Attempt to destroy file
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STA DESTPL+1
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LDA #>MOSFILE
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STA DESTPL+2
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JSR MLI
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DB DESTCMD
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DW DESTPL
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LDA #<MOSFILE ; Attempt to create file
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STA CREATEPL+1
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STA OPENPL+1
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LDA #>MOSFILE
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STA CREATEPL+2
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STA OPENPL+2
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LDA #$C3 ; Access unlocked
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STA CREATEPL+3
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LDA #$06 ; Filetype BIN
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STA CREATEPL+4
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LDA #$00 ; Auxtype
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STA CREATEPL+5
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LDA #$00
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STA CREATEPL+6
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LDA #$01 ; Storage type - file
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STA CREATEPL+7
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LDA $BF90 ; Current date
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STA CREATEPL+8
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LDA $BF91
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STA CREATEPL+9
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LDA $BF92 ; Current time
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STA CREATEPL+10
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LDA $BF93
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STA CREATEPL+11
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JSR CRTFILE
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:S0 LDA #$00 ; Look for empty slot
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JSR FINDBUF
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STX BUFIDX
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CPX #$00
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BNE :S1
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LDA #<IOBUF1
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LDY #>IOBUF1
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BRA :S4
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:S1 CPX #$01
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BNE :S2
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LDA #<IOBUF2
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LDY #>IOBUF2
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BRA :S4
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:S2 CPX #$02
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BNE :S3
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LDA #<IOBUF3
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LDY #>IOBUF3
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BRA :S4
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:S3 CPX #$03
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BNE :NOTFND ; Out of buffers really
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LDA #<IOBUF4
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LDY #>IOBUF4
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:S4 STA OPENPL2+3
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STY OPENPL2+4
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LDA #<MOSFILE
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STA OPENPL2+1
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LDA #>MOSFILE
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STA OPENPL2+2
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JSR MLI
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DB OPENCMD
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DW OPENPL2
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BCS :NOTFND
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LDA OPENPL2+5 ; File ref number
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LDX BUFIDX
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CPX #$FF
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BEQ FINDEXIT
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STA FILEREFS,X ; Record the ref number
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BRA FINDEXIT
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:NOTFND LDA #$00
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FINDEXIT >>> XF2AUX,OSFINDRET
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BUFIDX DB $00
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* ProDOS file handling for MOS OSFIND CLOSE call
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CFILE >>> ENTMAIN
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LDA MOSFILE ; File ref number
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STA CLSPL+1
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JSR CLSFILE
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LDA MOSFILE
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JSR FINDBUF
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CPX #$FF
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BEQ :S1
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LDA #$00
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STA FILEREFS,X
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:S1 JMP FINDEXIT
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* Map of file reference numbers to IOBUF1..4
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FILEREFS DB $00,$00,$00,$00
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* Search FILEREFS for value in A
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FINDBUF LDX #$00
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:L1 CMP FILEREFS,X
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BEQ :END
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INX
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CPX #$04
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BNE :L1
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LDX #$FF ; $FF for not found
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:END RTS
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* ProDOS file handling for MOS OSBGET call
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* Returns with char read in A and error num in Y (or 0)
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FILEGET >>> ENTMAIN
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LDA MOSFILE ; File ref number
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STA READPL2+1
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JSR MLI
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DB READCMD
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DW READPL2
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BCC :NOERR
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TAY ; Error number in Y
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BRA :EXIT
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:NOERR LDY #$00
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LDA BLKBUF
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:EXIT >>> XF2AUX,OSBGETRET
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* ProDOS file handling for MOS OSBPUT call
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* Enters with char to write in A
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FILEPUT >>> ENTMAIN
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STA BLKBUF ; Char to write
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LDA MOSFILE ; File ref number
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STA WRITEPL+1
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LDA #$01 ; Bytes to write
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STA WRITEPL+4
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LDA #$00
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STA WRITEPL+5
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JSR WRTFILE
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>>> XF2AUX,OSBPUTRET
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* ProDOS file handling for OSBYTE $7F EOF
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* Returns EOF status in A ($FF for EOF, $00 otherwise)
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FILEEOF >>> ENTMAIN
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LDA MOSFILE ; File ref number
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STA GEOFPL+1
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STA GMARKPL+1
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JSR MLI
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DB GEOFCMD
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DW GEOFPL
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BCS :ISEOF ; If error, just say EOF
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JSR MLI
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DB GMARKCMD
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DW GMARKPL
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BCS :ISEOF ; If error, just say EOF
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LDA GEOFPL+2 ; Subtract Mark from EOF
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SEC
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SBC GMARKPL+2
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STA :REMAIN
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LDA GEOFPL+3
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SBC GMARKPL+3
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STA :REMAIN+1
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LDA GEOFPL+4
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SBC GMARKPL+4
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STA :REMAIN+2
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LDA :REMAIN ; Check bytes remaining
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BNE :NOTEOF
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LDA :REMAIN+1
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BNE :NOTEOF
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LDA :REMAIN+2
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BNE :NOTEOF
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:ISEOF LDA #$FF
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BRA :EXIT
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:NOTEOF LDA #$00
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:EXIT >>> XF2AUX,CHKEOFRET
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:REMAIN DS 3 ; Remaining bytes
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* ProDOS file handling for OSARGS flush commands
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FLUSH >>> ENTMAIN
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LDA MOSFILE ; File ref number
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STA FLSHPL+1
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JSR MLI
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DB FLSHCMD
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DW FLSHPL
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>>> XF2AUX,OSARGSRET
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* ProDOS file handling for OSARGS set ptr command
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SEEK >>> ENTMAIN
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LDA MOSFILE ; File ref number
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STA GMARKPL+1 ; GET_MARK has same params
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LDA MOSFILE+2 ; Desired offset in MOSFILE[2..4]
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STA GMARKPL+2
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LDA MOSFILE+3
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STA GMARKPL+3
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LDA MOSFILE+4
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STA GMARKPL+4
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JSR MLI
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DB SMARKCMD
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DW GMARKPL
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>>> XF2AUX,OSARGSRET
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* ProDOS file handling for OSARGS get ptr command
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* and for OSARGs get length command
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TELL >>> ENTMAIN
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LDA MOSFILE ; File ref number
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STA GMARKPL+1
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LDA MOSFILE+2 ; Mode (0=pos, otherwise len)
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CMP #$00
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BEQ :POS
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JSR MLI
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DB GEOFCMD
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DW GMARKPL ; MARK parms same as EOF parms
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BRA :S1
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:POS JSR MLI
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DB GMARKCMD
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DW GMARKPL
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:S1 LDX MOSFILE+1 ; Pointer to ZP control block
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BCS :ERR
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>>> ALTZP ; Alt ZP & Alt LC on
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LDA GMARKPL+2
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STA $00,X
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LDA GMARKPL+3
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STA $01,X
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LDA GMARKPL+4
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STA $02,X
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STZ $03,X
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>>> MAINZP ; Alt ZP off, ROM back in
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:EXIT >>> XF2AUX,OSARGSRET
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:ERR LDX MOSFILE+1 ; Address of ZP control block
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>>> ALTZP ; Alt ZP & Alt LC on
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STZ $00,X
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STZ $01,X
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STZ $02,X
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STZ $03,X
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>>> MAINZP ; Alt ZP off, ROM back in
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BRA :EXIT
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* ProDOS file handling for MOS OSFILE LOAD call
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* Return A=0 if successful
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* A=1 if file not found
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* A=2 if read error
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LOADFILE >>> ENTMAIN
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STZ :BLOCKS
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LDA #<MOSFILE
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STA OPENPL+1
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LDA #>MOSFILE
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STA OPENPL+2
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JSR OPENFILE
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BCS :NOTFND ; File not found
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:L1 LDA OPENPL+5 ; File ref number
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STA READPL+1
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JSR RDFILE
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BCC :S1
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CMP #$4C ; EOF
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BEQ :EOF
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BRA :READERR
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:S1 LDA #<BLKBUF
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STA A1L
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LDA #>BLKBUF
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STA A1H
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LDA #<BLKBUFEND
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STA A2L
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LDA #>BLKBUFEND
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STA A2H
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LDA FBEXEC ; If FBEXEC is zero, use addr
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CMP #$00 ; in the control block
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BEQ :CBADDR
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LDA #<MOSFILE ; Otherwise use file addr
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STA GINFOPL+1
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LDA #>MOSFILE
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STA GINFOPL+2
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JSR MLI ; Call GET_FILE_INFO
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DB GINFOCMD
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DW GINFOPL
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BCS :READERR
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LDX GINFOPL+5 ; Aux type LSB
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STX FBLOAD
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LDY GINFOPL+6 ; Aux type MSB
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STY FBLOAD+1
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:CBADDR JSR PASSADDR ; Load addr -> code in aux bank
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LDA FBLOAD
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STA A4L
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LDA FBLOAD+1
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LDX :BLOCKS
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:L2 CPX #$00
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BEQ :S2
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INC
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INC
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DEX
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BRA :L2
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:S2 STA A4H
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SEC ; Main -> AUX
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JSR AUXMOVE
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INC :BLOCKS
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BRA :L1
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:NOTFND LDA #$01 ; Nothing found
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PHA
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BRA :EXIT
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:READERR LDA #$02 ; Read error
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BRA :EOF2
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:EOF LDA #$00 ; Success
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:EOF2 LDA OPENPL+5 ; File ref num
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STA CLSPL+1
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JSR CLSFILE
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:EXIT >>> XF2AUX,OSFILERET
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:BLOCKS DB $00
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* Stash address in XY to first two bytes of AUXBLK
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PASSADDR >>> ALTZP ; Alt ZP and LC
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STX AUXBLK
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STY AUXBLK+1
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>>> MAINZP ; Back to normal
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RTS
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* ProDOS file handling for MOS OSFILE SAVE call
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* Return A=0 if successful
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* A=1 if unable to create/open
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* A=2 if error during save
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SAVEFILE >>> ENTMAIN
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LDA #<MOSFILE ; Attempt to destroy file
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STA DESTPL+1
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LDA #>MOSFILE
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STA DESTPL+2
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JSR MLI
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DB DESTCMD
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DW DESTPL
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STZ :BLOCKS
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LDA #<MOSFILE
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STA CREATEPL+1
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STA OPENPL+1
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LDA #>MOSFILE
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STA CREATEPL+2
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STA OPENPL+2
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LDA #$C3 ; Access unlocked
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STA CREATEPL+3
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LDA #$06 ; Filetype BIN
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STA CREATEPL+4
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LDA FBSTRT ; Auxtype = start address
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STA CREATEPL+5
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LDA FBSTRT+1
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STA CREATEPL+6
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LDA #$01 ; Storage type - file
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STA CREATEPL+7
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LDA $BF90 ; Current date
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STA CREATEPL+8
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LDA $BF91
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STA CREATEPL+9
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LDA $BF92 ; Current time
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STA CREATEPL+10
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LDA $BF93
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STA CREATEPL+11
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JSR CRTFILE
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BCS :FWD1 ; :CANTOPEN error
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JSR OPENFILE
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BCS :FWD1 ; :CANTOPEN error
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SEC ; Compute file length
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LDA FBEND
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SBC FBSTRT
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STA :LEN
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LDA FBEND+1
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SBC FBSTRT+1
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STA :LEN+1
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:L1 LDA FBSTRT ; Setup for first block
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STA A1L
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STA A2L
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LDA FBSTRT+1
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STA A1H
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STA A2H
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INC A2H ; $200 = 512 bytes
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INC A2H
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LDA OPENPL+5 ; File ref number
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STA WRITEPL+1
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LDA #$00 ; 512 byte request count
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STA WRITEPL+4
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LDA #$02
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STA WRITEPL+5
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LDX :BLOCKS
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:L2 CPX #$00 ; Adjust for subsequent blks
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BEQ :S1
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INC A1H
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INC A1H
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INC A2H
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INC A2H
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DEX
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BRA :L2
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:FWD1 BRA :CANTOPEN ; Forwarding call from above
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:S1 LDA :LEN+1 ; MSB of length remaining
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CMP #$02
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BCS :S2 ; MSB of len >= 2 (not last)
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CMP #$00 ; If no bytes left ...
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BNE :S3
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LDA :LEN
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BNE :S3
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BRA :NORMALEND
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:S3 LDA FBEND ; Adjust for last block
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STA A2L
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LDA FBEND+1
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STA A2H
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LDA :LEN
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STA WRITEPL+4 ; Remaining bytes to write
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LDA :LEN+1
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STA WRITEPL+5
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:S2 LDA #<BLKBUF
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STA A4L
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LDA #>BLKBUF
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STA A4H
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CLC ; Aux -> Main
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JSR AUXMOVE
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LDA OPENPL+5 ; File ref number
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STA WRITEPL+1
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JSR WRTFILE
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BCS :WRITEERR
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BRA :UPDLEN
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:ENDLOOP INC :BLOCKS
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BRA :L1
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:UPDLEN SEC ; Update length remaining
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LDA :LEN
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SBC WRITEPL+4
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STA :LEN
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LDA :LEN+1
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SBC WRITEPL+5
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STA :LEN+1
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BRA :ENDLOOP
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:CANTOPEN
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LDA #$01 ; Can't open/create
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BRA :EXIT
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:WRITEERR
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LDA OPENPL+5 ; File ref num
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STA CLSPL+1
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JSR CLSFILE
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LDA #$02 ; Write error
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BRA :EXIT
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:NORMALEND
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LDA OPENPL+5 ; File ref num
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STA CLSPL+1
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JSR CLSFILE
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LDA #$00 ; Success!
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BCC :EXIT ; If close OK
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LDA #$02 ; Write error
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:EXIT >>> XF2AUX,OSFILERET
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:LEN DW $0000
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:BLOCKS DB $00
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|
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* Quit to ProDOS
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QUIT INC $3F4 ; Invalidate powerup byte
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STA $C054 ; PAGE2 off
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JSR MLI
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DB QUITCMD
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DW QUITPL
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RTS
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* Obtain catalog of current PREFIX dir
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CATALOG >>> ENTMAIN
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JSR MLI ; Fetch prefix into BLKBUF
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DB GPFXCMD
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DW GPFXPL
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BNE CATEXIT ; If prefix not set
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|
|
LDA #<BLKBUF
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STA OPENPL+1
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LDA #>BLKBUF
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STA OPENPL+2
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JSR OPENFILE
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BCS CATEXIT ; Can't open dir
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CATREENTRY
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LDA OPENPL+5 ; File ref num
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STA READPL+1
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JSR RDFILE
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BCC :S1
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CMP #$4C ; EOF
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BEQ :EOF
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BRA :READERR
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|
:S1 JSR COPYAUXBLK
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>>> XF2AUX,PRONEBLK
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:READERR
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:EOF LDA OPENPL+5 ; File ref num
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|
STA CLSPL+1
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JSR CLSFILE
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CATEXIT >>> XF2AUX,STARCATRET
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|
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* PRONEBLK call returns here ...
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|
CATALOGRET
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|
>>> ENTMAIN
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|
BRA CATREENTRY
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|
|
|
* Set the prefix
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|
SETPFX >>> ENTMAIN
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|
JSR MLI
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|
DB SPFXCMD
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DW SPFXPL
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|
BCC :S1
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JSR BELL ; Beep on error
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:S1 >>> XF2AUX,STARDIRRET
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|
|
|
* Create disk file
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|
CRTFILE JSR MLI
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|
DB CREATCMD
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|
DW CREATEPL
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|
RTS
|
|
|
|
* Open disk file
|
|
OPENFILE JSR MLI
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|
DB OPENCMD
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|
DW OPENPL
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|
RTS
|
|
|
|
* Close disk file
|
|
CLSFILE JSR MLI
|
|
DB CLSCMD
|
|
DW CLSPL
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|
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
|
|
|
|
* ProDOS Parameter lists for MLI calls
|
|
OPENPL HEX 03 ; Number of parameters
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|
DW $0000 ; Pointer to filename
|
|
DW IOBUF0 ; Pointer to IO buffer
|
|
DB $00 ; Reference number returned
|
|
|
|
OPENPL2 HEX 03 ; Number of parameters
|
|
DW $0000 ; Pointer to filename
|
|
DW $0000 ; Pointer to IO buffer
|
|
DB $00 ; Reference number returned
|
|
|
|
CREATEPL HEX 07 ; Number of parameters
|
|
DW $0000 ; Pointer to filename
|
|
DB $00 ; Access
|
|
DB $00 ; File type
|
|
DW $0000 ; Aux type
|
|
DB $00 ; Storage type
|
|
DW $0000 ; Create date
|
|
DW $0000 ; Create time
|
|
|
|
DESTPL HEX 01 ; Number of parameters
|
|
DW $0000 ; Pointer to filename
|
|
|
|
READPL HEX 04 ; Number of parameters
|
|
DB $00 ; Reference number
|
|
DW BLKBUF ; Pointer to data buffer
|
|
DW 512 ; Request count
|
|
DW $0000 ; Trans count
|
|
|
|
READPL2 HEX 04 ; Number of parameters
|
|
DB #00 ; Reference number
|
|
DW BLKBUF ; Pointer to data buffer
|
|
DW 1 ; Request count
|
|
DW $0000 ; Trans count
|
|
|
|
WRITEPL HEX 04 ; Number of parameters
|
|
DB $01 ; Reference number
|
|
DW BLKBUF ; Pointer to data buffer
|
|
DW $00 ; Request count
|
|
DW $0000 ; Trans count
|
|
|
|
CLSPL HEX 01 ; Number of parameters
|
|
DB $00 ; Reference number
|
|
|
|
FLSHPL HEX 01 ; Number of parameters
|
|
DB $00 ; Reference number
|
|
|
|
ONLPL HEX 02 ; Number of parameters
|
|
DB $00 ; Unit num
|
|
DW $301 ; Buffer
|
|
|
|
GSPFXPL HEX 01 ; Number of parameters
|
|
DW $300 ; Buffer
|
|
|
|
GPFXPL HEX 01 ; Number of parameters
|
|
DW BLKBUF ; Buffer
|
|
|
|
SPFXPL HEX 01 ; Number of parameters
|
|
DW MOSFILE ; Buffer
|
|
|
|
GMARKPL HEX 02 ; Number of parameters
|
|
DB $00 ; File reference number
|
|
DB $00 ; Mark (24 bit)
|
|
DB $00
|
|
DB $00
|
|
|
|
GEOFPL HEX 02 ; Number of parameters
|
|
DB $00 ; File reference number
|
|
DB $00 ; EOF (24 bit)
|
|
DB $00
|
|
DB $00
|
|
|
|
GINFOPL HEX 0A ; Number of parameters
|
|
DW $0000 ; Pointer to filename
|
|
DB $00 ; Access
|
|
DB $00 ; File type
|
|
DW $0000 ; Aux type
|
|
DB $00 ; Storage type
|
|
DW $0000 ; Blocks used
|
|
DW $0000 ; Mod date
|
|
DW $0000 ; Mod time
|
|
DW $0000 ; Create date
|
|
DW $0000 ; Create time
|
|
|
|
QUITPL HEX 04 ; Number of parameters
|
|
DB $00
|
|
DW $0000
|
|
DB $00
|
|
DW $0000
|
|
|
|
* Buffer for Acorn MOS filename
|
|
MOSFILE DS 64 ; 64 bytes max prefix/file len
|
|
|
|
* Acorn MOS format OSFILE param list
|
|
FILEBLK
|
|
FBPTR DW $0000 ; Pointer to name (in aux)
|
|
FBLOAD DW $0000 ; Load address
|
|
DW $0000
|
|
FBEXEC DW $0000 ; Exec address
|
|
DW $0000
|
|
FBSTRT DW $0000 ; Start address for SAVE
|
|
DW $0000
|
|
FBEND DW $0000 ; End address for SAVE
|
|
DW $0000
|
|
|