forked from Apple-2-HW/Apple2-IO-RPi
163 lines
6.0 KiB
Plaintext
163 lines
6.0 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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00C700 1 ;ID bytes for booting and drive detection
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00C700 1 E0 20 cpx #$20 ;ID bytes for ProDOS and the
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00C702 1 E0 00 cpx #$00 ; Apple Autostart ROM
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00C704 1 E0 03 cpx #$03 ;
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00C706 1
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00C706 1 A2 70 ldx #SLOT*$10
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00C708 1 86 2B stx $2b
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00C70A 1 86 43 stx Unit
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00C70C 1
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00C70C 1 ;force EPROM to second page on boot
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00C70C 1 A9 3F lda #$3f ;set all flags high and page 3 of EPROM for menu
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00C70E 1 PageJump:
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00C70E 1 8D F7 C0 sta OutputFlags
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00C711 1 4C 19 C7 jmp Start ;this jump is only called if coming in from PageJump with A=$2f
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00C714 1
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00C714 1 ;entry points for ProDOS
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00C714 1 DriverEntry:
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00C714 1 A9 0F lda #$0f ;set all flags high and page 0 of EPROM
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00C716 1 8D F7 C0 sta OutputFlags
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00C719 1
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00C719 1 Start:
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00C719 1 20 00 C3 jsr $c300 ;enable 80 columns
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00C71C 1 A5 33 lda $33
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00C71E 1 48 pha
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00C71F 1 A9 A4 lda #$a4
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00C721 1 85 33 sta $33
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00C723 1 GetCommand:
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00C723 1 20 67 FD jsr $fd67
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00C726 1 AD 00 02 lda $0200
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00C729 1 C9 8D cmp #$8d ;skip when return found
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00C72B 1 F0 F6 beq GetCommand
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00C72D 1 20 33 C7 jsr DumpOutput
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00C730 1 18 clc
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00C731 1 90 F0 bcc GetCommand
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00C733 1
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00C733 1 DumpOutput:
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00C733 1 A9 05 lda #$05 ;send command 5 = exec
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00C735 1 20 5C C7 jsr SendByte
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00C738 1 A0 00 ldy #$00
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00C73A 1 getInput:
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00C73A 1 B9 00 02 lda $0200,y
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00C73D 1 C9 8D cmp #$8d
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00C73F 1 F0 08 beq sendNullTerminator
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00C741 1 29 7F and #$7f
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00C743 1 20 5C C7 jsr SendByte
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00C746 1 C8 iny
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00C747 1 D0 F1 bne getInput
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00C749 1 sendNullTerminator:
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00C749 1 A9 00 lda #$00
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00C74B 1 20 5C C7 jsr SendByte
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00C74E 1 getOutput:
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00C74E 1 20 7A C7 jsr GetByte
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00C751 1 C9 00 cmp #$00
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00C753 1 F0 06 beq endOutput
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00C755 1 20 ED FD jsr $fded
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00C758 1 18 clc
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00C759 1 90 F3 bcc getOutput
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00C75B 1 endOutput:
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00C75B 1 60 rts
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00C75C 1
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00C75C 1 SendByte:
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00C75C 1 48 pha
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00C75D 1 waitWrite:
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00C75D 1 AD FB C0 lda InputFlags
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00C760 1 2A rol
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00C761 1 2A rol
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00C762 1 B0 F9 bcs waitWrite
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00C764 1 68 pla
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00C765 1 8D FD C0 sta OutputByte
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00C768 1 A9 1E lda #$1e ; set bit 0 low to indicate write started
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00C76A 1 8D F7 C0 sta OutputFlags
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00C76D 1 finishWrite:
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00C76D 1 AD FB C0 lda InputFlags
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00C770 1 2A rol
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00C771 1 2A rol
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00C772 1 90 F9 bcc finishWrite
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00C774 1 A9 1F lda #$1f
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00C776 1 8D F7 C0 sta OutputFlags
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00C779 1 60 rts
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00C77A 1
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00C77A 1 GetByte:
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00C77A 1 A9 1D lda #$1d ;set read flag low
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00C77C 1 8D F7 C0 sta OutputFlags
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00C77F 1 waitRead:
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00C77F 1 AD FB C0 lda InputFlags
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00C782 1 2A rol
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00C783 1 B0 FA bcs waitRead
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00C785 1 AD FE C0 lda InputByte
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00C788 1 48 pha
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00C789 1 A9 1F lda #$1f ;set all flags high
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00C78B 1 8D F7 C0 sta OutputFlags
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00C78E 1 finishRead:
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00C78E 1 AD FB C0 lda InputFlags
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00C791 1 2A rol
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00C792 1 90 FA bcc finishRead
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00C794 1 68 pla
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00C795 1 end:
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00C795 1 60 rts
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00C796 1
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00C796 1 00 00 00 00 .repeat 251-<end
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00C79A 1 00 00 00 00
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00C79E 1 00 00 00 00
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00C7A2 1 00 00 00 00
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00C7A6 1 00 00 00 00
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00C7AA 1 00 00 00 00
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00C7AE 1 00 00 00 00
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00C7B2 1 00 00 00 00
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00C7B6 1 00 00 00 00
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00C7BA 1 00 00 00 00
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00C7BE 1 00 00 00 00
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00C7C2 1 00 00 00 00
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00C7C6 1 00 00 00 00
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00C7CA 1 00 00 00 00
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00C7CE 1 00 00 00 00
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00C7D2 1 00 00 00 00
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00C7D6 1 00 00 00 00
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00C7DA 1 00 00 00 00
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00C7DE 1 00 00 00 00
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00C7E2 1 00 00 00 00
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00C7E6 1 00 00 00 00
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00C7EA 1 00 00 00 00
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00C7EE 1 00 00 00 00
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00C7F2 1 00 00 00 00
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00C7F6 1 00 00 00 00
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00C7FA 1 00 00
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00C7FC 1 .byte 0
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00C7FC 1 .endrepeat
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00C7FC 1 00 00 .byte 0,0 ;0000 blocks = check status
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00C7FE 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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00C7FF 1 14 .byte DriverEntry&$00FF ;low byte of entry
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00C7FF 1
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