mirror of
https://github.com/dschmenk/apple2pi.git
synced 2024-12-23 08:29:34 +00:00
249 lines
3.1 KiB
ArmAsm
Executable File
249 lines
3.1 KiB
ArmAsm
Executable File
.DEFINE EQU =
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.DEFINE DB .BYTE
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.DEFINE DW .WORD
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.CODE
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PISLOT EQU $00
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;*
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;* ACIA REGISTERS
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;*
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ACIADR EQU $C088+PISLOT*16
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ACIASR EQU $C089+PISLOT*16
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ACIACR EQU $C08A+PISLOT*16
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ACIAMR EQU $C08B+PISLOT*16
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;*
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;* APPLE I/O LOCATIONS
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;*
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KEYBD EQU $C000
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STROBE EQU $C010
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;*
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;* UTIL ROUTINES
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;*
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WAIT EQU $FCA8
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COUT EQU $FDED
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CROUT EQU $FD8E
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PRBYTE EQU $FDDA
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PRHEX EQU $FDE3
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PRNTAX EQU $F941
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RDKEY EQU $FD0C
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RDCHAR EQU $FD35
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GETLN EQU $FD6A
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;*
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;* ZERO PAGE PARAMETERS
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;*
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PDCMD EQU $42
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PDUNIT EQU $43
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PDBUFF EQU $44
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PDBUFL EQU $44
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PDBUFH EQU $45
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PDBLKL EQU $46
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PDBLKH EQU $47
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;*
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;* SLOT INDEX = SLOT # * 16
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;*
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SLOTIDX EQU $0300
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;*
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;* DRIVER SCRATCHPAD
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;*
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TMP EQU $0478+PISLOT
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PAD0 EQU $0478+PISLOT
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PAD1 EQU $04F8+PISLOT
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PAD2 EQU $0578+PISLOT
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PAD3 EQU $05F8+PISLOT
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PAD4 EQU $0678+PISLOT
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PAD5 EQU $06F8+PISLOT
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PAD6 EQU $0778+PISLOT
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PAD7 EQU $07F8+PISLOT
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;*
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;* PRODOS COMMANDS
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;*
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PDSTAT EQU 0
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PDREAD EQU 1
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PDWRITE EQU 2
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PDFORMT EQU 3
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;*
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;* PRODOS ERRORS
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;*
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PDNOERR EQU $00
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PDIOERR EQU $27
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PDNODEV EQU $28
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PDWRPRT EQU $2B
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;*
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;* PRODOS GLOBAL PAGE LOCATIONS
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;*
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CLKJMP EQU $BF06
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DEV1L EQU $BF10
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DEV1H EQU $BF11
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DEV2L EQU $BF20
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DEV2H EQU $BF21
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DEVCNT EQU $BF31
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DEVLST EQU $BF32
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PDTIME EQU $BF90
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;*
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;* ZERO PAGE LOCATIONS FOR LOADER
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;*
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DSTPTR EQU $06
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DSTL EQU $06
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DSTH EQU $07
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SRCPTR EQU $08
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SRCL EQU $08
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SRCH EQU $09
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;*
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;* DRIVER LOADER
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;*
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DRVRDST EQU $D742
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DRVRLEN EQU 125
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LDA #$4C
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STA CLKJMP ; HOOK CLOCK DRIVER (WITH JMP)
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LDA #<DRVRELOC
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STA SRCL
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LDA #>DRVRELOC
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STA SRCH
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LDA #<DRVRDST
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STA DSTL
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LDA #>DRVRDST
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STA DSTH
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LDY #DRVRLEN-1
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BIT $C08B ; ENABLE LCRAM & WRITE
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BIT $C08B
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CPYLP: LDA (SRCPTR),Y
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STA (DSTPTR),Y
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DEY
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BPL CPYLP
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INY
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LDX #SFIXUPTBL-IFIXUPTBL-1
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IFIXLP: LDA IFIXUPTBL,X
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STA DSTH
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DEX
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LDA IFIXUPTBL,X
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STA DSTL
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LDA (DSTPTR),Y
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ORA SLOTIDX
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STA (DSTPTR),Y
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DEX
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BPL IFIXLP
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LDX #DRVRELOC-SFIXUPTBL-1
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SFIXLP: LDA SFIXUPTBL,X
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STA DSTH
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DEX
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LDA SFIXUPTBL,X
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STA DSTL
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LDA SLOTIDX
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LSR
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LSR
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LSR
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LSR
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CLC
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ADC (DSTPTR),Y
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STA (DSTPTR),Y
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DEX
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BPL SFIXLP
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BIT $C08A ; EBABLE ROM
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LDA SLOTIDX
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LSR
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LSR
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LSR
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TAX
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LDA DEV1H,X
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CMP #$DE ; GNODEV
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BNE INSDEV2
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LDA #<DRVRDST
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STA DEV1L,X
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LDA #>DRVRDST
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STA DEV1H,X
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INY
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INSDEV2:
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LDA DEV2H,X
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CMP #$DE
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BNE INCDEV1
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LDA #<DRVRDST
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STA DEV2L,X
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LDA #>DRVRDST
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STA DEV2H,X
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INY
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INCDEV1:
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CPY #$00
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BEQ EXIT ; NOTHING TO BE DONE HERE
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LDX #$00
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DEV1LP: LDA DEVLST,X
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BNE NXTDEV1
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LDA SLOTIDX
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ORA #$01
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STA DEVLST,X
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INC DEVCNT
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BNE INCDEV2
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NXTDEV1:
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INX
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CPX #14
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BNE DEV1LP
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INCDEV2:
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LDX #$00
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DEV2LP: LDA DEVLST,X
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BNE NXTDEV2
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LDA SLOTIDX
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ORA #$81
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STA DEVLST,X
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INC DEVCNT
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BNE EXIT
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NXTDEV2:
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INX
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CPX #14
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BNE DEV2LP
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EXIT: RTS
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;*
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;* FIXUP TABLE
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;*
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IFIXUPTBL:
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DW FIXUP1+1
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DW FIXUP2+1
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DW FIXUP3+1
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DW FIXUP4+1
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SFIXUPTBL:
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DW FIXUP5+1
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DW FIXUP6+1
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DRVRELOC:
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;*
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;* PRODOS CLOCK ROUTINE
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;*
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.ORG DRVRDST
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DOCLK: LDA #$AC
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PHP
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FIXUP5: STA PAD0
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SEI
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JSR SENDACC
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TXA
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JSR SENDACC
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TYA
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JSR SENDACC
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CHKACK: JSR RECVACC
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TAX
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DEX
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FIXUP6: CPX PAD0
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BNE CHKACK
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LDY #$00
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CLKLP: JSR RECVACC
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STA PDTIME,Y
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INY
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CPY #$04
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BNE CLKLP
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PLP
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RTS
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;*
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;* ACIA I/O ROUTINES
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;*
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SENDACC:
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PHA
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FIXUP1:
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SENDWT: LDA ACIASR
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AND #$10
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BEQ SENDWT
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PLA
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FIXUP2: STA ACIADR
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RTS
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RECVACC:
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FIXUP3:
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RECVWT: LDA ACIASR
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AND #$08
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BEQ RECVWT
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FIXUP4: LDA ACIADR
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RTS
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