mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-06-10 01:29:31 +00:00
99 lines
3.9 KiB
Plaintext
99 lines
3.9 KiB
Plaintext
ca65 V2.18 - N/A
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Main file : MenuFirmware.asm
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Current file: MenuFirmware.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 1F lda #$1f ;set all flags high and page 1 of EPROMi
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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
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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 ;since the firmware page changes to 0, this falls through to the driver
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00C519 1
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00C519 1 Start:
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00C519 1 20 58 FC jsr $fc58
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00C51C 1 A0 00 ldy #$00
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00C51E 1 PrintString:
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00C51E 1 B9 3A C5 lda Text,y
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00C521 1 09 80 ora #$80
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00C523 1 F0 06 beq GetChar
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00C525 1 20 ED FD jsr $fded
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00C528 1 C8 iny
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00C529 1 D0 F3 bne PrintString
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00C52B 1
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00C52B 1 GetChar:
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00C52B 1 20 1B FD jsr $fd1b
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00C52E 1 38 sec ;subtract ascii "1" to get 0 - 3 from "1" to "4"
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00C52F 1 E9 B1 sbc #$b1
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00C531 1 0A asl ;put in top nibble as EPROM page
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00C532 1 0A asl
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00C533 1 0A asl
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00C534 1 0A asl
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00C535 1 09 0F ora #$0f ;set all flags high
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00C537 1 4C 0E C5 jmp PageJump
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00C53A 1
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00C53A 1 Text:
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00C53A 1
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00C53A 1 31 2E 20 42 .byte "1. Boot",$8d
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00C53E 1 6F 6F 74 8D
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00C542 1 32 2E 20 46 .byte "2. File Access",$8d
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00C546 1 69 6C 65 20
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00C54A 1 41 63 63 65
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00C551 1 33 2E 20 43 .byte "3. Command Line",$8d
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00C555 1 6F 6D 6D 61
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00C559 1 6E 64 20 4C
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00C561 1
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00C561 1 end:
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00C561 1 60 rts
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00C562 1
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00C562 1 00 00 00 00 .repeat 251-<end
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00C566 1 00 00 00 00
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00C56A 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
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