mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-06-09 10:29:28 +00:00
109 lines
4.2 KiB
Plaintext
109 lines
4.2 KiB
Plaintext
ca65 V2.18 - N/A
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Main file : FileAccessFirmware.asm
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Current file: FileAccessFirmware.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
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00C519 1 ; Put command firmware here
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00C519 1 ;
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00C519 1 ;
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00C519 1 ;
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00C519 1 60 rts
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00C51A 1
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00C51A 1 SendByte:
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00C51A 1 48 pha
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00C51B 1 waitWrite:
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00C51B 1 AD DB C0 lda InputFlags
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00C51E 1 2A rol
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00C51F 1 2A rol
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00C520 1 B0 F9 bcs waitWrite
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00C522 1 68 pla
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00C523 1 8D DD C0 sta OutputByte
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00C526 1 A9 0E lda #$0e ; set bit 0 low to indicate write started
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00C528 1 8D D7 C0 sta OutputFlags
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00C52B 1 finishWrite:
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00C52B 1 AD DB C0 lda InputFlags
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00C52E 1 2A rol
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00C52F 1 2A rol
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00C530 1 90 F9 bcc finishWrite
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00C532 1 A9 0F lda #$0f
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00C534 1 8D D7 C0 sta OutputFlags
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00C537 1 60 rts
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00C538 1
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00C538 1 GetByte:
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00C538 1 A9 0D lda #$0d ;set read flag low
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00C53A 1 8D D7 C0 sta OutputFlags
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00C53D 1 waitRead:
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00C53D 1 AD DB C0 lda InputFlags
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00C540 1 2A rol
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00C541 1 B0 FA bcs waitRead
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00C543 1 AD DE C0 lda InputByte
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00C546 1 48 pha
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00C547 1 A9 0F lda #$0f ;set all flags high
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00C549 1 8D D7 C0 sta OutputFlags
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00C54C 1 finishRead:
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00C54C 1 AD DB C0 lda InputFlags
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00C54F 1 2A rol
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00C550 1 90 FA bcc finishRead
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00C552 1 68 pla
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00C553 1 end:
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00C553 1 60 rts
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00C554 1
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00C554 1 00 00 00 00 .repeat 251-<end
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00C558 1 00 00 00 00
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00C55C 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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