mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-06-10 01:29:31 +00:00
146 lines
5.7 KiB
Plaintext
146 lines
5.7 KiB
Plaintext
ca65 V2.18 - N/A
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Main file : CommandFirmware.asm
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Current file: CommandFirmware.asm
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000000r 1 ;ProDOS Zero Page
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000000r 1 Command = $42 ;ProDOS Command
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000000r 1 Unit = $43 ;ProDOS unit (SDDD0000)
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000000r 1 BufferLo = $44
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000000r 1 BufferHi = $45
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000000r 1 BlockLo = $46
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000000r 1 BlockHi = $47
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000000r 1
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000000r 1 ; ProDOS Error Codes
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000000r 1 IOError = $27
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000000r 1 NoDevice = $28
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000000r 1 WriteProtect = $2B
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000000r 1
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000000r 1 InputByte = $c08e+SLOT*$10
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000000r 1 OutputByte = $c08d+SLOT*$10
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000000r 1 InputFlags = $c08b+SLOT*$10
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000000r 1 OutputFlags = $c087+SLOT*$10
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000000r 1
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000000r 1 ReadBlockCommand = $01
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000000r 1 WriteBlockCommand = $02
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000000r 1 GetTimeCommand = $03
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000000r 1 ChangeDriveCommand = $04
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000000r 1 ExecCommand = $05
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000000r 1 LoadFileCommand = $06
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000000r 1 SaveFileCommand = $07
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000000r 1
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000000r 1 .org SLOT*$100 + $C000
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00C500 1 ;ID bytes for booting and drive detection
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00C500 1 E0 20 cpx #$20 ;ID bytes for ProDOS and the
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00C502 1 E0 00 cpx #$00 ; Apple Autostart ROM
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00C504 1 E0 03 cpx #$03 ;
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00C506 1
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00C506 1 A2 50 ldx #SLOT*$10
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00C508 1 86 2B stx $2b
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00C50A 1 86 43 stx Unit
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00C50C 1
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00C50C 1 ;force EPROM to second page on boot
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00C50C 1 A9 3F lda #$3f ;set all flags high and page 3 of EPROM for menu
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00C50E 1 PageJump:
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00C50E 1 8D D7 C0 sta OutputFlags
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00C511 1 4C 19 C5 jmp Start ;this jump is only called if coming in from PageJump with A=$2f
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00C514 1
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00C514 1 ;entry points for ProDOS
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00C514 1 DriverEntry:
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00C514 1 A9 0F lda #$0f ;set all flags high and page 0 of EPROM
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00C516 1 8D D7 C0 sta OutputFlags
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00C519 1
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00C519 1 Start:
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00C519 1 20 00 C3 jsr $c300 ;enable 80 columns
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00C51C 1 A5 33 lda $33
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00C51E 1 48 pha
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00C51F 1 A9 A4 lda #$a4
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00C521 1 85 33 sta $33
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00C523 1 GetCommand:
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00C523 1 20 67 FD jsr $fd67
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00C526 1 AD 00 02 lda $0200
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00C529 1 C9 8D cmp #$8d ;skip when return found
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00C52B 1 F0 F6 beq GetCommand
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00C52D 1 20 33 C5 jsr DumpOutput
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00C530 1 18 clc
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00C531 1 90 F0 bcc GetCommand
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00C533 1
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00C533 1 DumpOutput:
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00C533 1 A9 05 lda #$05 ;send command 5 = exec
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00C535 1 20 5C C5 jsr SendByte
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00C538 1 A0 00 ldy #$00
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00C53A 1 getInput:
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00C53A 1 B9 00 02 lda $0200,y
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00C53D 1 C9 8D cmp #$8d
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00C53F 1 F0 08 beq sendNullTerminator
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00C541 1 29 7F and #$7f
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00C543 1 20 5C C5 jsr SendByte
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00C546 1 C8 iny
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00C547 1 D0 F1 bne getInput
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00C549 1 sendNullTerminator:
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00C549 1 A9 00 lda #$00
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00C54B 1 20 5C C5 jsr SendByte
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00C54E 1 getOutput:
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00C54E 1 20 7A C5 jsr GetByte
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00C551 1 C9 00 cmp #$00
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00C553 1 F0 06 beq endOutput
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00C555 1 20 ED FD jsr $fded
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00C558 1 18 clc
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00C559 1 90 F3 bcc getOutput
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00C55B 1 endOutput:
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00C55B 1 60 rts
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00C55C 1
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00C55C 1 SendByte:
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00C55C 1 48 pha
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00C55D 1 waitWrite:
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00C55D 1 AD DB C0 lda InputFlags
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00C560 1 2A rol
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00C561 1 2A rol
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00C562 1 B0 F9 bcs waitWrite
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00C564 1 68 pla
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00C565 1 8D DD C0 sta OutputByte
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00C568 1 A9 1E lda #$1e ; set bit 0 low to indicate write started
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00C56A 1 8D D7 C0 sta OutputFlags
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00C56D 1 finishWrite:
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00C56D 1 AD DB C0 lda InputFlags
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00C570 1 2A rol
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00C571 1 2A rol
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00C572 1 90 F9 bcc finishWrite
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00C574 1 A9 1F lda #$1f
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00C576 1 8D D7 C0 sta OutputFlags
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00C579 1 60 rts
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00C57A 1
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00C57A 1 GetByte:
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00C57A 1 A9 1D lda #$1d ;set read flag low
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00C57C 1 8D D7 C0 sta OutputFlags
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00C57F 1 waitRead:
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00C57F 1 AD DB C0 lda InputFlags
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00C582 1 2A rol
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00C583 1 B0 FA bcs waitRead
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00C585 1 AD DE C0 lda InputByte
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00C588 1 48 pha
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00C589 1 A9 1F lda #$1f ;set all flags high
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00C58B 1 8D D7 C0 sta OutputFlags
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00C58E 1 finishRead:
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00C58E 1 AD DB C0 lda InputFlags
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00C591 1 2A rol
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00C592 1 90 FA bcc finishRead
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00C594 1 68 pla
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00C595 1 end:
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00C595 1 60 rts
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00C596 1
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00C596 1 00 00 00 00 .repeat 251-<end
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00C59A 1 00 00 00 00
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00C59E 1 00 00 00 00
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00C5FC 1 .byte 0
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00C5FC 1 .endrepeat
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00C5FC 1 00 00 .byte 0,0 ;0000 blocks = check status
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00C5FE 1 07 .byte 7 ;bit set(0=status 1=read 2=write) unset(3=format, 4/5=number of volumes, 6=interruptable, 7=removable)
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00C5FF 1 14 .byte DriverEntry&$00FF ;low byte of entry
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00C600 1
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00C600 1 ;Translation of code written in mini-assembler on Apple //e
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00C600 1 ;Currently only works if card is in slot 5
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00C600 1
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00C600 1 .org $1000
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001000 1
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001000 1
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