ca65 V2.18 - Debian 2.19-1 Main file : CommandFirmware.asm Current file: CommandFirmware.asm 000000r 1 ; Copyright Terence J. Boldt (c)2020-2024 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 AD 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 2C FB C0 bit InputFlags 00C798 1 70 FB bvs SendByte 00C79A 1 8D FD C0 sta OutputByte 00C79D 1 .if HW_TYPE = 0 00C79D 1 A9 1E lda #$1e ; set bit 0 low to indicate write started 00C79F 1 8D F7 C0 sta OutputFlags 00C7A2 1 finishWrite: 00C7A2 1 2C FB C0 bit InputFlags 00C7A5 1 50 FB bvc finishWrite 00C7A7 1 A9 1F lda #$1f 00C7A9 1 8D F7 C0 sta OutputFlags 00C7AC 1 .endif 00C7AC 1 60 rts 00C7AD 1 00C7AD 1 GetByte: 00C7AD 1 .if HW_TYPE = 0 00C7AD 1 A2 1D ldx #$1d ;set read flag low 00C7AF 1 8E F7 C0 stx OutputFlags 00C7B2 1 .endif 00C7B2 1 waitRead: 00C7B2 1 2C FB C0 bit InputFlags 00C7B5 1 10 0C bpl readByte 00C7B7 1 2C 00 C0 bit Keyboard ;keypress will abort waiting to read 00C7BA 1 10 F6 bpl waitRead 00C7BC 1 .if HW_TYPE = 0 00C7BC 1 A9 1F lda #$1f ;set all flags high and exit 00C7BE 1 8D F7 C0 sta OutputFlags 00C7C1 1 .endif 00C7C1 1 38 sec ;failure 00C7C2 1 60 rts 00C7C3 1 readByte: 00C7C3 1 AD FE C0 lda InputByte 00C7C6 1 .if HW_TYPE = 0 00C7C6 1 A2 1F ldx #$1f ;set all flags high 00C7C8 1 8E F7 C0 stx OutputFlags 00C7CB 1 finishRead: 00C7CB 1 2C FB C0 bit InputFlags 00C7CE 1 10 FB bpl finishRead 00C7D0 1 .endif 00C7D0 1 18 clc ;success 00C7D1 1 end: 00C7D1 1 60 rts 00C7D2 1 00C7D2 1 00 00 00 00 .repeat 251-