forked from Apple-2-HW/Apple2-IO-RPi
88 lines
1.6 KiB
NASM
88 lines
1.6 KiB
NASM
|
;ProDOS Zero Page
|
||
|
|
Command = $42 ;ProDOS Command
|
||
|
|
Unit = $43 ;ProDOS unit (SDDD0000)
|
||
|
|
BufferLo = $44
|
||
|
|
BufferHi = $45
|
||
|
|
BlockLo = $46
|
||
|
|
BlockHi = $47
|
||
|
|
|
||
|
|
; ProDOS Error Codes
|
||
|
|
IOError = $27
|
||
|
|
NoDevice = $28
|
||
|
|
WriteProtect = $2B
|
||
|
|
|
||
|
|
InputByte = $c08e
|
||
|
|
OutputByte = $c08d
|
||
|
|
InputFlags = $c08b
|
||
|
|
OutputFlags = $c087
|
||
|
|
|
||
|
|
ReadBlockCommand = $01
|
||
|
|
WriteBlockCommand = $02
|
||
|
|
GetTimeCommand = $03
|
||
|
|
ChangeDriveCommand = $04
|
||
|
|
ExecCommand = $05
|
||
|
|
LoadFileCommand = $06
|
||
|
|
SaveFileCommand = $07
|
||
|
|
|
||
|
|
.org SLOT*$100 + $C000
|
||
|
|
;ID bytes for booting and drive detection
|
||
|
|
cpx #$20 ;ID bytes for ProDOS and the
|
||
|
|
cpx #$00 ; Apple Autostart ROM
|
||
|
|
cpx #$03 ;
|
||
|
|
|
||
|
|
ldx #SLOT*$10
|
||
|
|
stx $2b
|
||
|
|
stx Unit
|
||
|
|
|
||
|
|
;force EPROM to second page on boot
|
||
|
|
lda #$1f ;set all flags high and page 1 of EPROMi
|
||
|
|
PageJump:
|
||
|
|
sta OutputFlags,x
|
||
|
|
jmp Start
|
||
|
|
|
||
|
|
;entry points for ProDOS
|
||
|
|
DriverEntry:
|
||
|
|
lda #$0f ;set all flags high and page 0 of EPROM
|
||
|
|
sta OutputFlags,x
|
||
|
|
;since the firmware page changes to 0, this falls through to the driver
|
||
|
|
|
||
|
|
Start:
|
||
|
|
jsr $fc58
|
||
|
|
ldy #$00
|
||
|
|
PrintString:
|
||
|
|
lda Text,y
|
||
|
|
ora #$80
|
||
|
|
beq GetChar
|
||
|
|
jsr $fded
|
||
|
|
iny
|
||
|
|
bne PrintString
|
||
|
|
|
||
|
|
GetChar:
|
||
|
|
jsr $fd1b
|
||
|
|
sec ;subtract ascii "1" to get 0 - 3 from "1" to "4"
|
||
|
|
sbc #$b1
|
||
|
|
asl ;put in top nibble as EPROM page
|
||
|
|
asl
|
||
|
|
asl
|
||
|
|
asl
|
||
|
|
ora #$0f ;set all flags high
|
||
|
|
jmp PageJump
|
||
|
|
|
||
|
|
Text:
|
||
|
|
|
||
|
|
.byte "1. Boot",$8d
|
||
|
|
.byte "2. Set Clock",$8d
|
||
|
|
.byte "3. Command Line",$8d
|
||
|
|
.byte "4. File Access",$8d
|
||
|
|
|
||
|
|
end:
|
||
|
|
rts
|
||
|
|
|
||
|
|
.repeat 251-<end
|
||
|
|
.byte 0
|
||
|
|
.endrepeat
|
||
|
|
.byte 0,0 ;0000 blocks = check status
|
||
|
|
.byte 7 ;bit set(0=status 1=read 2=write) unset(3=format, 4/5=number of volumes, 6=interruptable, 7=removable)
|
||
|
|
.byte DriverEntry&$00FF ;low byte of entry
|
||
|
|
|