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 A5 33 lda $33 00C51B 1 48 pha 00C51C 1 A9 A4 lda #$a4 00C51E 1 85 33 sta $33 00C520 1 GetCommand: 00C520 1 20 6A FD jsr $fd6a 00C523 1 AD 00 02 lda $0200 00C526 1 C9 8D cmp #$8d ;stop when return found 00C528 1 F0 06 beq ExitApp 00C52A 1 20 38 C5 jsr DumpOutput 00C52D 1 18 clc 00C52E 1 90 F0 bcc GetCommand 00C530 1 ExitApp: 00C530 1 68 pla 00C531 1 85 33 sta $33 00C533 1 A9 00 lda #$00 00C535 1 84 34 sty $34 00C537 1 60 rts 00C538 1 00C538 1 DumpOutput: 00C538 1 A2 50 ldx #$50 00C53A 1 A9 05 lda #$05 ;send command 5 = exec 00C53C 1 20 63 C5 jsr SendByte 00C53F 1 A0 00 ldy #$00 00C541 1 getInput: 00C541 1 B9 00 02 lda $0200,y 00C544 1 C9 8D cmp #$8d 00C546 1 F0 08 beq sendNullTerminator 00C548 1 29 7F and #$7f 00C54A 1 20 63 C5 jsr SendByte 00C54D 1 C8 iny 00C54E 1 D0 F1 bne getInput 00C550 1 sendNullTerminator: 00C550 1 A9 00 lda #$00 00C552 1 20 63 C5 jsr SendByte 00C555 1 getOutput: 00C555 1 20 81 C5 jsr GetByte 00C558 1 C9 00 cmp #$00 00C55A 1 F0 06 beq endOutput 00C55C 1 20 ED FD jsr $fded 00C55F 1 18 clc 00C560 1 90 F3 bcc getOutput 00C562 1 endOutput: 00C562 1 60 rts 00C563 1 00C563 1 SendByte: 00C563 1 48 pha 00C564 1 waitWrite: 00C564 1 AD DB C0 lda InputFlags 00C567 1 2A rol 00C568 1 2A rol 00C569 1 B0 F9 bcs waitWrite 00C56B 1 68 pla 00C56C 1 8D DD C0 sta OutputByte 00C56F 1 A9 0E lda #$0e ; set bit 0 low to indicate write started 00C571 1 8D D7 C0 sta OutputFlags 00C574 1 finishWrite: 00C574 1 AD DB C0 lda InputFlags 00C577 1 2A rol 00C578 1 2A rol 00C579 1 90 F9 bcc finishWrite 00C57B 1 A9 0F lda #$0f 00C57D 1 8D D7 C0 sta OutputFlags 00C580 1 60 rts 00C581 1 00C581 1 GetByte: 00C581 1 A9 0D lda #$0d ;set read flag low 00C583 1 8D D7 C0 sta OutputFlags 00C586 1 waitRead: 00C586 1 AD DB C0 lda InputFlags 00C589 1 2A rol 00C58A 1 B0 FA bcs waitRead 00C58C 1 AD DE C0 lda InputByte 00C58F 1 48 pha 00C590 1 A9 0F lda #$0f ;set all flags high 00C592 1 8D D7 C0 sta OutputFlags 00C595 1 finishRead: 00C595 1 AD DB C0 lda InputFlags 00C598 1 2A rol 00C599 1 90 FA bcc finishRead 00C59B 1 68 pla 00C59C 1 end: 00C59C 1 60 rts 00C59D 1 00C59D 1 00 00 00 00 .repeat 251-