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 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 A5 33 lda $33 00C71E 1 48 pha 00C71F 1 A9 A4 lda #$a4 00C721 1 85 33 sta $33 00C723 1 GetCommand: 00C723 1 20 67 FD jsr $fd67 00C726 1 AD 00 02 lda $0200 00C729 1 C9 8D cmp #$8d ;skip when return found 00C72B 1 F0 F6 beq GetCommand 00C72D 1 20 33 C7 jsr DumpOutput 00C730 1 18 clc 00C731 1 90 F0 bcc GetCommand 00C733 1 00C733 1 DumpOutput: 00C733 1 A9 05 lda #$05 ;send command 5 = exec 00C735 1 20 5C C7 jsr SendByte 00C738 1 A0 00 ldy #$00 00C73A 1 getInput: 00C73A 1 B9 00 02 lda $0200,y 00C73D 1 C9 8D cmp #$8d 00C73F 1 F0 08 beq sendNullTerminator 00C741 1 29 7F and #$7f 00C743 1 20 5C C7 jsr SendByte 00C746 1 C8 iny 00C747 1 D0 F1 bne getInput 00C749 1 sendNullTerminator: 00C749 1 A9 00 lda #$00 00C74B 1 20 5C C7 jsr SendByte 00C74E 1 getOutput: 00C74E 1 20 7A C7 jsr GetByte 00C751 1 C9 00 cmp #$00 00C753 1 F0 06 beq endOutput 00C755 1 20 ED FD jsr $fded 00C758 1 18 clc 00C759 1 90 F3 bcc getOutput 00C75B 1 endOutput: 00C75B 1 60 rts 00C75C 1 00C75C 1 SendByte: 00C75C 1 48 pha 00C75D 1 waitWrite: 00C75D 1 AD FB C0 lda InputFlags 00C760 1 2A rol 00C761 1 2A rol 00C762 1 B0 F9 bcs waitWrite 00C764 1 68 pla 00C765 1 8D FD C0 sta OutputByte 00C768 1 A9 1E lda #$1e ; set bit 0 low to indicate write started 00C76A 1 8D F7 C0 sta OutputFlags 00C76D 1 finishWrite: 00C76D 1 AD FB C0 lda InputFlags 00C770 1 2A rol 00C771 1 2A rol 00C772 1 90 F9 bcc finishWrite 00C774 1 A9 1F lda #$1f 00C776 1 8D F7 C0 sta OutputFlags 00C779 1 60 rts 00C77A 1 00C77A 1 GetByte: 00C77A 1 A9 1D lda #$1d ;set read flag low 00C77C 1 8D F7 C0 sta OutputFlags 00C77F 1 waitRead: 00C77F 1 AD FB C0 lda InputFlags 00C782 1 2A rol 00C783 1 B0 FA bcs waitRead 00C785 1 AD FE C0 lda InputByte 00C788 1 48 pha 00C789 1 A9 1F lda #$1f ;set all flags high 00C78B 1 8D F7 C0 sta OutputFlags 00C78E 1 finishRead: 00C78E 1 AD FB C0 lda InputFlags 00C791 1 2A rol 00C792 1 90 FA bcc finishRead 00C794 1 68 pla 00C795 1 end: 00C795 1 60 rts 00C796 1 00C796 1 00 00 00 00 .repeat 251-