Apple-2-HW/Apple2-IO-RPi
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Apple2-IO-RPi/Apple2/CommandFirmware.lst
Terence Boldt 841b11f9ae
Add graphics conversion 
* Update copyright year

* Update module to add image support
2023-01-14 10:51:39 -05:00

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ca65 V2.18 - Raspbian 2.19-1
Main file : CommandFirmware.asm
Current file: CommandFirmware.asm
000000r 1 ; Copyright Terence J. Boldt (c)2020-2023
000000r 1 ; Use of this source code is governed by an MIT
000000r 1 ; license that can be found in the LICENSE file.
000000r 1
000000r 1 ; This file contains the source for the firmware
000000r 1 ; that was formerly used to act as a pseudo-shell
000000r 1
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 MenuCommand = $08
000000r 1
000000r 1 InputString = $fd67
000000r 1 PrintChar = $fded
000000r 1 Keyboard = $c000
000000r 1 ClearKeyboard = $c010
000000r 1 Wait = $fca8
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 19 C7 jmp Start ;this jump is only called if coming in from PageJump with A=$2f
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
00C719 1 Start:
00C719 1 20 00 C3 jsr $c300 ;enable 80 columns
00C71C 1 A9 05 lda #$05 ;execute command
00C71E 1 20 95 C7 jsr SendByte
00C721 1 A0 00 ldy #$00
00C723 1 sendHelp:
00C723 1 B9 8E C7 lda HelpCommand,y
00C726 1 F0 06 beq endSendHelp
00C728 1 20 95 C7 jsr SendByte
00C72B 1 C8 iny
00C72C 1 D0 F5 bne sendHelp
00C72E 1 endSendHelp:
00C72E 1 A9 00 lda #$00
00C730 1 20 95 C7 jsr SendByte
00C733 1 20 6B C7 jsr DumpOutput
00C736 1
00C736 1 A5 33 lda $33
00C738 1 48 pha
00C739 1 A9 A4 lda #$a4
00C73B 1 85 33 sta $33
00C73D 1 GetCommand:
00C73D 1 20 67 FD jsr InputString
00C740 1 AD 00 02 lda $0200
00C743 1 C9 8D cmp #$8d ;skip when return found
00C745 1 F0 F6 beq GetCommand
00C747 1 20 4D C7 jsr SendCommand
00C74A 1 18 clc
00C74B 1 90 F0 bcc GetCommand
00C74D 1
00C74D 1 SendCommand:
00C74D 1 2C 10 C0 bit ClearKeyboard
00C750 1 A9 05 lda #$05 ;send command 5 = exec
00C752 1 20 95 C7 jsr SendByte
00C755 1 A0 00 ldy #$00
00C757 1 getInput:
00C757 1 B9 00 02 lda $0200,y
00C75A 1 C9 8D cmp #$8d
00C75C 1 F0 08 beq sendNullTerminator
00C75E 1 29 7F and #$7f
00C760 1 20 95 C7 jsr SendByte
00C763 1 C8 iny
00C764 1 D0 F1 bne getInput
00C766 1 sendNullTerminator:
00C766 1 A9 00 lda #$00
00C768 1 20 95 C7 jsr SendByte
00C76B 1 DumpOutput:
00C76B 1 20 B3 C7 jsr GetByte
00C76E 1 B0 07 bcs skipOutput
00C770 1 C9 00 cmp #$00
00C772 1 F0 19 beq endOutput
00C774 1 20 ED FD jsr PrintChar
00C777 1 skipOutput:
00C777 1 2C 00 C0 bit Keyboard ;check for keypress
00C77A 1 10 EF bpl DumpOutput ;keep dumping output if no keypress
00C77C 1 AD 00 C0 lda Keyboard ;send keypress to RPi
00C77F 1 20 ED FD jsr PrintChar
00C782 1 29 7F and #$7f
00C784 1 20 95 C7 jsr SendByte
00C787 1 2C 10 C0 bit ClearKeyboard
00C78A 1 18 clc
00C78B 1 90 DE bcc DumpOutput
00C78D 1 endOutput:
00C78D 1 60 rts
00C78E 1
00C78E 1 HelpCommand:
00C78E 1 61 32 68 65 .byte "a2help",$00
00C792 1 6C 70 00
00C795 1
00C795 1 SendByte:
00C795 1 48 pha
00C796 1 waitWrite:
00C796 1 AD FB C0 lda InputFlags
00C799 1 2A rol
00C79A 1 2A rol
00C79B 1 B0 F9 bcs waitWrite
00C79D 1 68 pla
00C79E 1 8D FD C0 sta OutputByte
00C7A1 1 A9 1E lda #$1e ; set bit 0 low to indicate write started
00C7A3 1 8D F7 C0 sta OutputFlags
00C7A6 1 finishWrite:
00C7A6 1 AD FB C0 lda InputFlags
00C7A9 1 2A rol
00C7AA 1 2A rol
00C7AB 1 90 F9 bcc finishWrite
00C7AD 1 A9 1F lda #$1f
00C7AF 1 8D F7 C0 sta OutputFlags
00C7B2 1 60 rts
00C7B3 1
00C7B3 1 GetByte:
00C7B3 1 A9 1D lda #$1d ;set read flag low
00C7B5 1 8D F7 C0 sta OutputFlags
00C7B8 1 waitRead:
00C7B8 1 AD FB C0 lda InputFlags
00C7BB 1 2A rol
00C7BC 1 90 0C bcc readByte
00C7BE 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read
00C7C1 1 10 F5 bpl waitRead
00C7C3 1 A9 1F lda #$1f ;set all flags high and exit
00C7C5 1 8D F7 C0 sta OutputFlags
00C7C8 1 38 sec ;failure
00C7C9 1 60 rts
00C7CA 1 readByte:
00C7CA 1 AD FE C0 lda InputByte
00C7CD 1 48 pha
00C7CE 1 A9 1F lda #$1f ;set all flags high
00C7D0 1 8D F7 C0 sta OutputFlags
00C7D3 1 finishRead:
00C7D3 1 AD FB C0 lda InputFlags
00C7D6 1 2A rol
00C7D7 1 90 FA bcc finishRead
00C7D9 1 68 pla
00C7DA 1 18 clc ;success
00C7DB 1 end:
00C7DB 1 60 rts
00C7DC 1
00C7DC 1 00 00 00 00 .repeat 251-<end
00C7E0 1 00 00 00 00
00C7E4 1 00 00 00 00
00C7E8 1 00 00 00 00
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
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
00C7FF 1
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