Apple-2-HW/Apple2-IO-RPi
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Apple2-IO-RPi/Apple2/DriveFirmware.lst
Terence Boldt ed62dd961e Fix firmware so menu works called by PR#
2021-03-28 10:27:53 -04:00

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ca65 V2.18 - N/A
Main file : DriveFirmware.asm
Current file: DriveFirmware.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
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 1C C5 jmp Start ;this jump is only called if coming in from PageJump with A=$0f
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 4C 32 C5 jmp Driver
00C51C 1
00C51C 1 ;load first two blocks and execute to boot
00C51C 1 Start:
00C51C 1 A9 01 lda #$01 ;set read command
00C51E 1 85 42 sta Command
00C520 1
00C520 1 A9 00 lda #$00 ;block 0
00C522 1 85 46 sta BlockLo
00C524 1 85 47 sta BlockHi
00C526 1 85 44 sta BufferLo ;buffer at $800
00C528 1 A9 08 lda #$08
00C52A 1 85 45 sta BufferHi
00C52C 1 20 32 C5 jsr Driver ;get the block
00C52F 1
00C52F 1 4C 01 08 jmp $801 ;execute the block
00C532 1
00C532 1 ; ProDOS Driver code
00C532 1 ; First check that this is the right drive
00C532 1 Driver:
00C532 1 A6 43 ldx Unit
00C534 1 A5 42 lda Command; Check which command is being requested
00C536 1 F0 0C beq GetStatus ;0 = Status command
00C538 1 C9 01 cmp #ReadBlockCommand
00C53A 1 F0 10 beq ReadBlock
00C53C 1 C9 02 cmp #WriteBlockCommand
00C53E 1 F0 46 beq WriteBlock
00C540 1 38 sec ;set carry as we don't support any other commands
00C541 1 A9 53 lda #$53 ;Invalid parameter error
00C543 1 60 rts
00C544 1
00C544 1 ; ProDOS Status Command Handler
00C544 1 GetStatus:
00C544 1 A2 FF ldx #$ff ;low byte number of blocks
00C546 1 A0 FF ldy #$ff ;high byte number of blocks
00C548 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
00C54A 1 18 clc
00C54B 1 60 rts
00C54C 1
00C54C 1 ; ProDOS Read Block Command
00C54C 1 ReadBlock:
00C54C 1 A0 00 ldy #$00 ;Get the current time on each block read for now
00C54E 1 A9 03 lda #GetTimeCommand
00C550 1 20 AE C5 jsr SendByte
00C553 1 getTimeByte:
00C553 1 20 CC C5 jsr GetByte
00C556 1 99 90 BF sta $bf90,y
00C559 1 C8 iny
00C55A 1 C0 04 cpy #$04
00C55C 1 D0 F5 bne getTimeByte
00C55E 1 A9 01 lda #ReadBlockCommand ;read the block after setting the clock
00C560 1 20 AE C5 jsr SendByte
00C563 1 A5 46 lda BlockLo
00C565 1 20 AE C5 jsr SendByte
00C568 1 A5 47 lda BlockHi
00C56A 1 20 AE C5 jsr SendByte
00C56D 1 A0 00 ldy #$0
00C56F 1 20 7D C5 jsr read256
00C572 1 E6 45 inc BufferHi
00C574 1 20 7D C5 jsr read256
00C577 1 C6 45 dec BufferHi
00C579 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
00C57B 1 18 clc
00C57C 1 60 rts
00C57D 1
00C57D 1 read256:
00C57D 1 20 CC C5 jsr GetByte
00C580 1 91 44 sta (BufferLo),y
00C582 1 C8 iny
00C583 1 D0 F8 bne read256
00C585 1 60 rts
00C586 1
00C586 1 ; ProDOS Write Block Command
00C586 1 WriteBlock:
00C586 1 A9 02 lda #WriteBlockCommand
00C588 1 20 AE C5 jsr SendByte
00C58B 1 A5 46 lda BlockLo
00C58D 1 20 AE C5 jsr SendByte
00C590 1 A5 47 lda BlockHi
00C592 1 20 AE C5 jsr SendByte
00C595 1 A0 00 ldy #$0
00C597 1 20 A5 C5 jsr write256
00C59A 1 E6 45 inc BufferHi
00C59C 1 20 A5 C5 jsr write256
00C59F 1 C6 45 dec BufferHi
00C5A1 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
00C5A3 1 18 clc
00C5A4 1 60 rts
00C5A5 1
00C5A5 1 write256:
00C5A5 1 B1 44 lda (BufferLo),y
00C5A7 1 20 AE C5 jsr SendByte
00C5AA 1 C8 iny
00C5AB 1 D0 F8 bne write256
00C5AD 1 60 rts
00C5AE 1
00C5AE 1 SendByte:
00C5AE 1 48 pha
00C5AF 1 waitWrite:
00C5AF 1 AD DB C0 lda InputFlags
00C5B2 1 2A rol
00C5B3 1 2A rol
00C5B4 1 B0 F9 bcs waitWrite
00C5B6 1 68 pla
00C5B7 1 8D DD C0 sta OutputByte
00C5BA 1 A9 0E lda #$0e ; set bit 0 low to indicate write started
00C5BC 1 8D D7 C0 sta OutputFlags
00C5BF 1 finishWrite:
00C5BF 1 AD DB C0 lda InputFlags
00C5C2 1 2A rol
00C5C3 1 2A rol
00C5C4 1 90 F9 bcc finishWrite
00C5C6 1 A9 0F lda #$0f
00C5C8 1 8D D7 C0 sta OutputFlags
00C5CB 1 60 rts
00C5CC 1
00C5CC 1 GetByte:
00C5CC 1 A9 0D lda #$0d ;set read flag low
00C5CE 1 8D D7 C0 sta OutputFlags
00C5D1 1 waitRead:
00C5D1 1 AD DB C0 lda InputFlags
00C5D4 1 2A rol
00C5D5 1 B0 FA bcs waitRead
00C5D7 1 AD DE C0 lda InputByte
00C5DA 1 48 pha
00C5DB 1 A9 0F lda #$0f ;set all flags high
00C5DD 1 8D D7 C0 sta OutputFlags
00C5E0 1 finishRead:
00C5E0 1 AD DB C0 lda InputFlags
00C5E3 1 2A rol
00C5E4 1 90 FA bcc finishRead
00C5E6 1 68 pla
00C5E7 1 end:
00C5E7 1 60 rts
00C5E8 1
00C5E8 1 00 00 00 00 .repeat 251-<end
00C5EC 1 00 00 00 00
00C5F0 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
00C600 1
00C600 1
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