Apple2-IO-RPi/Apple2/CommandFirmware.lst

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