ca65 V2.18 - N/A
Main file   : FileAccessFirmware.asm
Current file: FileAccessFirmware.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               
00C519  1               ; Put command firmware here
00C519  1               ;
00C519  1               ;
00C519  1               ;
00C519  1               
00C519  1               
00C519  1               SendByte:
00C519  1  48            pha
00C51A  1               waitWrite:
00C51A  1  AD DB C0      lda InputFlags
00C51D  1  2A            rol
00C51E  1  2A            rol
00C51F  1  B0 F9         bcs waitWrite
00C521  1  68            pla
00C522  1  8D DD C0      sta OutputByte
00C525  1  A9 0E         lda #$0e ; set bit 0 low to indicate write started
00C527  1  8D D7 C0      sta OutputFlags
00C52A  1               finishWrite:
00C52A  1  AD DB C0      lda InputFlags
00C52D  1  2A            rol
00C52E  1  2A            rol
00C52F  1  90 F9         bcc finishWrite
00C531  1  A9 0F         lda #$0f
00C533  1  8D D7 C0      sta OutputFlags
00C536  1  60            rts
00C537  1               
00C537  1               GetByte:
00C537  1  A9 0D         lda #$0d ;set read flag low
00C539  1  8D D7 C0      sta OutputFlags
00C53C  1               waitRead:
00C53C  1  AD DB C0      lda InputFlags
00C53F  1  2A            rol
00C540  1  B0 FA         bcs waitRead
00C542  1  AD DE C0      lda InputByte
00C545  1  48            pha
00C546  1  A9 0F         lda #$0f ;set all flags high
00C548  1  8D D7 C0      sta OutputFlags
00C54B  1               finishRead:
00C54B  1  AD DB C0      lda InputFlags
00C54E  1  2A            rol
00C54F  1  90 FA         bcc finishRead
00C551  1  68            pla
00C552  1               end:
00C552  1  60            rts
00C553  1               
00C553  1  00 00 00 00  .repeat	251-<end
00C557  1  00 00 00 00  
00C55B  1  00 00 00 00  
00C5FC  1               .byte 0
00C5FC  1               .endrepeat
00C5FC  1  00 00        .byte      0,0     ;0000 blocks = check status
00C5FE  1  07           .byte      7       ;bit set(0=status 1=read 2=write) unset(3=format, 4/5=number of volumes, 6=interruptable, 7=removable)
00C5FF  1  14           .byte     DriverEntry&$00FF ;low byte of entry
00C600  1               
00C600  1