ca65 V2.18 - N/A Main file : CommandFirmware.asm Current file: CommandFirmware.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 19 C5 jmp Start ;this jump is only called if coming in from PageJump with A=$2f 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 00C519 1 Start: 00C519 1 20 00 C3 jsr $c300 ;enable 80 columns 00C51C 1 A5 33 lda $33 00C51E 1 48 pha 00C51F 1 A9 A4 lda #$a4 00C521 1 85 33 sta $33 00C523 1 GetCommand: 00C523 1 20 67 FD jsr $fd67 00C526 1 AD 00 02 lda $0200 00C529 1 C9 8D cmp #$8d ;skip when return found 00C52B 1 F0 F6 beq GetCommand 00C52D 1 20 33 C5 jsr DumpOutput 00C530 1 18 clc 00C531 1 90 F0 bcc GetCommand 00C533 1 00C533 1 DumpOutput: 00C533 1 A9 05 lda #$05 ;send command 5 = exec 00C535 1 20 5C C5 jsr SendByte 00C538 1 A0 00 ldy #$00 00C53A 1 getInput: 00C53A 1 B9 00 02 lda $0200,y 00C53D 1 C9 8D cmp #$8d 00C53F 1 F0 08 beq sendNullTerminator 00C541 1 29 7F and #$7f 00C543 1 20 5C C5 jsr SendByte 00C546 1 C8 iny 00C547 1 D0 F1 bne getInput 00C549 1 sendNullTerminator: 00C549 1 A9 00 lda #$00 00C54B 1 20 5C C5 jsr SendByte 00C54E 1 getOutput: 00C54E 1 20 7A C5 jsr GetByte 00C551 1 C9 00 cmp #$00 00C553 1 F0 06 beq endOutput 00C555 1 20 ED FD jsr $fded 00C558 1 18 clc 00C559 1 90 F3 bcc getOutput 00C55B 1 endOutput: 00C55B 1 60 rts 00C55C 1 00C55C 1 SendByte: 00C55C 1 48 pha 00C55D 1 waitWrite: 00C55D 1 AD DB C0 lda InputFlags 00C560 1 2A rol 00C561 1 2A rol 00C562 1 B0 F9 bcs waitWrite 00C564 1 68 pla 00C565 1 8D DD C0 sta OutputByte 00C568 1 A9 1E lda #$1e ; set bit 0 low to indicate write started 00C56A 1 8D D7 C0 sta OutputFlags 00C56D 1 finishWrite: 00C56D 1 AD DB C0 lda InputFlags 00C570 1 2A rol 00C571 1 2A rol 00C572 1 90 F9 bcc finishWrite 00C574 1 A9 1F lda #$1f 00C576 1 8D D7 C0 sta OutputFlags 00C579 1 60 rts 00C57A 1 00C57A 1 GetByte: 00C57A 1 A9 1D lda #$1d ;set read flag low 00C57C 1 8D D7 C0 sta OutputFlags 00C57F 1 waitRead: 00C57F 1 AD DB C0 lda InputFlags 00C582 1 2A rol 00C583 1 B0 FA bcs waitRead 00C585 1 AD DE C0 lda InputByte 00C588 1 48 pha 00C589 1 A9 1F lda #$1f ;set all flags high 00C58B 1 8D D7 C0 sta OutputFlags 00C58E 1 finishRead: 00C58E 1 AD DB C0 lda InputFlags 00C591 1 2A rol 00C592 1 90 FA bcc finishRead 00C594 1 68 pla 00C595 1 end: 00C595 1 60 rts 00C596 1 00C596 1 00 00 00 00 .repeat 251-