mirror of
https://github.com/tjboldt/Apple2-IO-RPi.git
synced 2024-11-18 21:06:44 +00:00
196 lines
7.9 KiB
Plaintext
196 lines
7.9 KiB
Plaintext
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ca65 V2.18 - N/A
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Main file : DriveFirmware.asm
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Current file: DriveFirmware.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
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000000r 1 OutputByte = $c08d
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000000r 1 InputFlags = $c08b
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000000r 1 OutputFlags = $c087
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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 EPROM
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00C50E 1 PageJump:
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00C50E 1 9D 87 C0 sta OutputFlags,x
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00C511 1 4C 1C C5 jmp Start ;this jump is only called if coming in from PageJump with A=$0f
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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 9D 87 C0 sta OutputFlags,x
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00C519 1 4C 32 C5 jmp Driver
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00C51C 1
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00C51C 1 ;load first two blocks and execute to boot
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00C51C 1 Start:
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00C51C 1 A9 01 lda #$01 ;set read command
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00C51E 1 85 42 sta Command
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00C520 1
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00C520 1 A9 00 lda #$00 ;block 0
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00C522 1 85 46 sta BlockLo
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00C524 1 85 47 sta BlockHi
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00C526 1 85 44 sta BufferLo ;buffer at $800
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00C528 1 A9 08 lda #$08
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00C52A 1 85 45 sta BufferHi
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00C52C 1 20 32 C5 jsr Driver ;get the block
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00C52F 1
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00C52F 1 4C 01 08 jmp $801 ;execute the block
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00C532 1
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00C532 1 ; ProDOS Driver code
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00C532 1 ; First check that this is the right drive
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00C532 1 Driver:
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00C532 1 A6 43 ldx Unit
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00C534 1 A5 42 lda Command; Check which command is being requested
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00C536 1 F0 0C beq GetStatus ;0 = Status command
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00C538 1 C9 01 cmp #ReadBlockCommand
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00C53A 1 F0 10 beq ReadBlock
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00C53C 1 C9 02 cmp #WriteBlockCommand
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00C53E 1 F0 46 beq WriteBlock
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00C540 1 38 sec ;set carry as we don't support any other commands
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00C541 1 A9 53 lda #$53 ;Invalid parameter error
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00C543 1 60 rts
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00C544 1
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00C544 1 ; ProDOS Status Command Handler
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00C544 1 GetStatus:
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00C544 1 A2 FF ldx #$ff ;low byte number of blocks
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00C546 1 A0 FF ldy #$ff ;high byte number of blocks
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00C548 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
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00C54A 1 18 clc
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00C54B 1 60 rts
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00C54C 1
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00C54C 1 ; ProDOS Read Block Command
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00C54C 1 ReadBlock:
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00C54C 1 A0 00 ldy #$00 ;Get the current time on each block read for now
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00C54E 1 A9 03 lda #GetTimeCommand
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00C550 1 20 AE C5 jsr SendByte
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00C553 1 getTimeByte:
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00C553 1 20 CC C5 jsr GetByte
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00C556 1 99 90 BF sta $bf90,y
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00C559 1 C8 iny
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00C55A 1 C0 04 cpy #$04
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00C55C 1 D0 F5 bne getTimeByte
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00C55E 1 A9 01 lda #ReadBlockCommand ;read the block after setting the clock
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00C560 1 20 AE C5 jsr SendByte
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00C563 1 A5 46 lda BlockLo
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00C565 1 20 AE C5 jsr SendByte
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00C568 1 A5 47 lda BlockHi
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00C56A 1 20 AE C5 jsr SendByte
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00C56D 1 A0 00 ldy #$0
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00C56F 1 20 7D C5 jsr read256
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00C572 1 E6 45 inc BufferHi
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00C574 1 20 7D C5 jsr read256
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00C577 1 C6 45 dec BufferHi
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00C579 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
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00C57B 1 18 clc
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00C57C 1 60 rts
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00C57D 1
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00C57D 1 read256:
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00C57D 1 20 CC C5 jsr GetByte
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00C580 1 91 44 sta (BufferLo),y
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00C582 1 C8 iny
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00C583 1 D0 F8 bne read256
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00C585 1 60 rts
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00C586 1
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00C586 1 ; ProDOS Write Block Command
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00C586 1 WriteBlock:
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00C586 1 A9 02 lda #WriteBlockCommand
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00C588 1 20 AE C5 jsr SendByte
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00C58B 1 A5 46 lda BlockLo
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00C58D 1 20 AE C5 jsr SendByte
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00C590 1 A5 47 lda BlockHi
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00C592 1 20 AE C5 jsr SendByte
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00C595 1 A0 00 ldy #$0
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00C597 1 20 A5 C5 jsr write256
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00C59A 1 E6 45 inc BufferHi
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00C59C 1 20 A5 C5 jsr write256
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00C59F 1 C6 45 dec BufferHi
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00C5A1 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
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00C5A3 1 18 clc
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00C5A4 1 60 rts
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00C5A5 1
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00C5A5 1 write256:
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00C5A5 1 B1 44 lda (BufferLo),y
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00C5A7 1 20 AE C5 jsr SendByte
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00C5AA 1 C8 iny
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00C5AB 1 D0 F8 bne write256
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00C5AD 1 60 rts
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00C5AE 1
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00C5AE 1 SendByte:
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00C5AE 1 48 pha
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00C5AF 1 waitWrite:
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00C5AF 1 BD 8B C0 lda InputFlags,x
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00C5B2 1 2A rol
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00C5B3 1 2A rol
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00C5B4 1 B0 F9 bcs waitWrite
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00C5B6 1 68 pla
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00C5B7 1 9D 8D C0 sta OutputByte,x
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00C5BA 1 A9 0E lda #$0e ; set bit 0 low to indicate write started
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00C5BC 1 9D 87 C0 sta OutputFlags,x
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00C5BF 1 finishWrite:
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00C5BF 1 BD 8B C0 lda InputFlags,x
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00C5C2 1 2A rol
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00C5C3 1 2A rol
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00C5C4 1 90 F9 bcc finishWrite
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00C5C6 1 A9 0F lda #$0f
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00C5C8 1 9D 87 C0 sta OutputFlags,x
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00C5CB 1 60 rts
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00C5CC 1
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00C5CC 1 GetByte:
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00C5CC 1 A9 0D lda #$0d ;set read flag low
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00C5CE 1 9D 87 C0 sta OutputFlags,x
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00C5D1 1 waitRead:
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00C5D1 1 BD 8B C0 lda InputFlags,x
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00C5D4 1 2A rol
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00C5D5 1 B0 FA bcs waitRead
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00C5D7 1 BD 8E C0 lda InputByte,x
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00C5DA 1 48 pha
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00C5DB 1 A9 0F lda #$0f ;set all flags high
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00C5DD 1 9D 87 C0 sta OutputFlags,x
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00C5E0 1 finishRead:
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00C5E0 1 BD 8B C0 lda InputFlags,x
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00C5E3 1 2A rol
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00C5E4 1 90 FA bcc finishRead
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00C5E6 1 68 pla
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00C5E7 1 end:
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00C5E7 1 60 rts
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00C5E8 1
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00C5E8 1 00 00 00 00 .repeat 251-<end
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00C5EC 1 00 00 00 00
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00C5F0 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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