ca65 V2.18 - N/A Main file : MenuFirmware.asm Current file: MenuFirmware.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 1 of EPROMi 00C50E 1 PageJump: 00C50E 1 8D D7 C0 sta OutputFlags 00C511 1 4C 19 C5 jmp Start 00C514 1 00C514 1 ;entry points for ProDOS 00C514 1 DriverEntry: 00C514 1 A9 0F lda #$0f ;set all flags high and page 0 of EPROM 00C516 1 8D D7 C0 sta OutputFlags 00C519 1 ;since the firmware page changes to 0, this falls through to the driver 00C519 1 00C519 1 Start: 00C519 1 A9 F0 lda #$f0 ;restore COUT after PR# called 00C51B 1 85 36 sta $36 00C51D 1 A9 FD lda #$fd 00C51F 1 85 37 sta $37 00C521 1 20 58 FC jsr $fc58 ;clear screen and show menu options 00C524 1 A0 00 ldy #$00 00C526 1 PrintString: 00C526 1 B9 42 C5 lda Text,y 00C529 1 F0 08 beq GetChar 00C52B 1 09 80 ora #$80 00C52D 1 20 ED FD jsr $fded 00C530 1 C8 iny 00C531 1 D0 F3 bne PrintString 00C533 1 00C533 1 GetChar: 00C533 1 20 1B FD jsr $fd1b 00C536 1 38 sec ;subtract ascii "1" to get 0 - 3 from "1" to "4" 00C537 1 E9 B1 sbc #$b1 00C539 1 0A asl ;put in top nibble as EPROM page 00C53A 1 0A asl 00C53B 1 0A asl 00C53C 1 0A asl 00C53D 1 09 0F ora #$0f ;set all flags high 00C53F 1 4C 0E C5 jmp PageJump 00C542 1 00C542 1 Text: 00C542 1 00C542 1 41 70 70 6C .byte "Apple2-IO-RPi",$8d 00C546 1 65 32 2D 49 00C54A 1 4F 2D 52 50 00C550 1 28 63 29 32 .byte "(c)2020-2021 Terence J. Boldt",$8d,$8d 00C554 1 30 32 30 2D 00C558 1 32 30 32 31 00C56F 1 31 2E 20 42 .byte "1. Boot",$8d 00C573 1 6F 6F 74 8D 00C577 1 32 2E 20 46 .byte "2. File Access",$8d 00C57B 1 69 6C 65 20 00C57F 1 41 63 63 65 00C586 1 33 2E 20 43 .byte "3. Command Line",$8d,$00 00C58A 1 6F 6D 6D 61 00C58E 1 6E 64 20 4C 00C597 1 00C597 1 end: 00C597 1 60 rts 00C598 1 00C598 1 00 00 00 00 .repeat 251-