Apple2-IO-RPi/Apple2/DriveFirmware.lst
2021-04-01 08:43:04 -04:00

198 lines
7.9 KiB
Plaintext

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
00C700 1 ;ID bytes for booting and drive detection
00C700 1 E0 20 cpx #$20 ;ID bytes for ProDOS and the
00C702 1 E0 00 cpx #$00 ; Apple Autostart ROM
00C704 1 E0 03 cpx #$03 ;
00C706 1
00C706 1 A2 70 ldx #SLOT*$10
00C708 1 86 2B stx $2b
00C70A 1 86 43 stx Unit
00C70C 1
00C70C 1 ;force EPROM to second page on boot
00C70C 1 A9 3F lda #$3f ;set all flags high and page 3 of EPROM for menu
00C70E 1 PageJump:
00C70E 1 8D F7 C0 sta OutputFlags
00C711 1 4C 1C C7 jmp Start ;this jump is only called if coming in from PageJump with A=$0f
00C714 1
00C714 1 ;entry points for ProDOS
00C714 1 DriverEntry:
00C714 1 A9 0F lda #$0f ;set all flags high and page 0 of EPROM
00C716 1 8D F7 C0 sta OutputFlags
00C719 1 4C 32 C7 jmp Driver
00C71C 1
00C71C 1 ;load first two blocks and execute to boot
00C71C 1 Start:
00C71C 1 A9 01 lda #$01 ;set read command
00C71E 1 85 42 sta Command
00C720 1
00C720 1 A9 00 lda #$00 ;block 0
00C722 1 85 46 sta BlockLo
00C724 1 85 47 sta BlockHi
00C726 1 85 44 sta BufferLo ;buffer at $800
00C728 1 A9 08 lda #$08
00C72A 1 85 45 sta BufferHi
00C72C 1 20 32 C7 jsr Driver ;get the block
00C72F 1
00C72F 1 4C 01 08 jmp $801 ;execute the block
00C732 1
00C732 1 ; ProDOS Driver code
00C732 1 ; First check that this is the right drive
00C732 1 Driver:
00C732 1 A6 43 ldx Unit
00C734 1 A5 42 lda Command; Check which command is being requested
00C736 1 F0 0C beq GetStatus ;0 = Status command
00C738 1 C9 01 cmp #ReadBlockCommand
00C73A 1 F0 10 beq ReadBlock
00C73C 1 C9 02 cmp #WriteBlockCommand
00C73E 1 F0 46 beq WriteBlock
00C740 1 38 sec ;set carry as we don't support any other commands
00C741 1 A9 53 lda #$53 ;Invalid parameter error
00C743 1 60 rts
00C744 1
00C744 1 ; ProDOS Status Command Handler
00C744 1 GetStatus:
00C744 1 A2 FF ldx #$ff ;low byte number of blocks
00C746 1 A0 FF ldy #$ff ;high byte number of blocks
00C748 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
00C74A 1 18 clc
00C74B 1 60 rts
00C74C 1
00C74C 1 ; ProDOS Read Block Command
00C74C 1 ReadBlock:
00C74C 1 A0 00 ldy #$00 ;Get the current time on each block read for now
00C74E 1 A9 03 lda #GetTimeCommand
00C750 1 20 AE C7 jsr SendByte
00C753 1 getTimeByte:
00C753 1 20 CC C7 jsr GetByte
00C756 1 99 90 BF sta $bf90,y
00C759 1 C8 iny
00C75A 1 C0 04 cpy #$04
00C75C 1 D0 F5 bne getTimeByte
00C75E 1 A9 01 lda #ReadBlockCommand ;read the block after setting the clock
00C760 1 20 AE C7 jsr SendByte
00C763 1 A5 46 lda BlockLo
00C765 1 20 AE C7 jsr SendByte
00C768 1 A5 47 lda BlockHi
00C76A 1 20 AE C7 jsr SendByte
00C76D 1 A0 00 ldy #$0
00C76F 1 20 7D C7 jsr read256
00C772 1 E6 45 inc BufferHi
00C774 1 20 7D C7 jsr read256
00C777 1 C6 45 dec BufferHi
00C779 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
00C77B 1 18 clc
00C77C 1 60 rts
00C77D 1
00C77D 1 read256:
00C77D 1 20 CC C7 jsr GetByte
00C780 1 91 44 sta (BufferLo),y
00C782 1 C8 iny
00C783 1 D0 F8 bne read256
00C785 1 60 rts
00C786 1
00C786 1 ; ProDOS Write Block Command
00C786 1 WriteBlock:
00C786 1 A9 02 lda #WriteBlockCommand
00C788 1 20 AE C7 jsr SendByte
00C78B 1 A5 46 lda BlockLo
00C78D 1 20 AE C7 jsr SendByte
00C790 1 A5 47 lda BlockHi
00C792 1 20 AE C7 jsr SendByte
00C795 1 A0 00 ldy #$0
00C797 1 20 A5 C7 jsr write256
00C79A 1 E6 45 inc BufferHi
00C79C 1 20 A5 C7 jsr write256
00C79F 1 C6 45 dec BufferHi
00C7A1 1 A9 00 lda #$0 ;zero accumulator and clear carry for success
00C7A3 1 18 clc
00C7A4 1 60 rts
00C7A5 1
00C7A5 1 write256:
00C7A5 1 B1 44 lda (BufferLo),y
00C7A7 1 20 AE C7 jsr SendByte
00C7AA 1 C8 iny
00C7AB 1 D0 F8 bne write256
00C7AD 1 60 rts
00C7AE 1
00C7AE 1 SendByte:
00C7AE 1 48 pha
00C7AF 1 waitWrite:
00C7AF 1 AD FB C0 lda InputFlags
00C7B2 1 2A rol
00C7B3 1 2A rol
00C7B4 1 B0 F9 bcs waitWrite
00C7B6 1 68 pla
00C7B7 1 8D FD C0 sta OutputByte
00C7BA 1 A9 0E lda #$0e ; set bit 0 low to indicate write started
00C7BC 1 8D F7 C0 sta OutputFlags
00C7BF 1 finishWrite:
00C7BF 1 AD FB C0 lda InputFlags
00C7C2 1 2A rol
00C7C3 1 2A rol
00C7C4 1 90 F9 bcc finishWrite
00C7C6 1 A9 0F lda #$0f
00C7C8 1 8D F7 C0 sta OutputFlags
00C7CB 1 60 rts
00C7CC 1
00C7CC 1 GetByte:
00C7CC 1 A9 0D lda #$0d ;set read flag low
00C7CE 1 8D F7 C0 sta OutputFlags
00C7D1 1 waitRead:
00C7D1 1 AD FB C0 lda InputFlags
00C7D4 1 2A rol
00C7D5 1 B0 FA bcs waitRead
00C7D7 1 AD FE C0 lda InputByte
00C7DA 1 48 pha
00C7DB 1 A9 0F lda #$0f ;set all flags high
00C7DD 1 8D F7 C0 sta OutputFlags
00C7E0 1 finishRead:
00C7E0 1 AD FB C0 lda InputFlags
00C7E3 1 2A rol
00C7E4 1 90 FA bcc finishRead
00C7E6 1 68 pla
00C7E7 1 end:
00C7E7 1 60 rts
00C7E8 1
00C7E8 1 00 00 00 00 .repeat 251-<end
00C7EC 1 00 00 00 00
00C7F0 1 00 00 00 00
00C7F4 1 00 00 00 00
00C7F8 1 00 00 00 00
00C7FC 1 .byte 0
00C7FC 1 .endrepeat
00C7FC 1 00 00 .byte 0,0 ;0000 blocks = check status
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)
00C7FF 1 14 .byte DriverEntry&$00FF ;low byte of entry
00C800 1
00C800 1