forked from Apple-2-HW/ProDOS-ROM-Drive
Merge pull request #13 from tjboldt/firmware-fix
Update driver to not need JSR $FF58 on entry
This commit is contained in:
Terence Boldt
GitHub
commit
784a63edbf
Binary file not shown.
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@ -2,12 +2,6 @@
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writeLatchHigh = $C081
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writeLatchLow = $C080
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;temp variables becasue 6502 only has 3 registers
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highLatch = $F8
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lowLatch = $F9
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tempY = $FE
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blockHalfCounter = $FF
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;ProDOS defines
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command = $42 ;ProDOS command
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unit = $43 ;7=drive 6-4=slot 3-0=not used
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@ -19,158 +13,174 @@
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nodev = $28 ;no device connected
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wperr = $2B ;write protect error
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;for relocatable code, address to jump to instead of JSR absolute + RTS
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jumpAddressLo = $FA
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jumpAddressHi = $FB
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ioAddressLo = $FC
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ioAddressHi = $FD
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knownRts = $FF58
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;for relocatable code
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ioAddressLo = $FA
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ioAddressHi = $FB
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tempY = $FC
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blockHalfCounter = $FD
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lowLatch = $FE
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highLatch = $FF
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knownRts = $FF58
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.org $C700
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.org $C700
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;code is relocatable
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; but set to $c700 for
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; readability
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;ID bytes for booting and drive detection
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cpx #$20 ;ID bytes for ProDOS and the
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ldy #$00 ; Apple Autostart ROM
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cpx #$03 ;
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cpx #$3C ;this one for older II's
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cpx #$20 ;ID bytes for ProDOS and the
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ldy #$00 ; Apple Autostart ROM
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cpx #$03 ;
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cpx #$3C ;this one for older II's
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;zero out block numbers and buffer address
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sty buflo
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sty blklo
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sty blkhi
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iny ;set command = 1 for read block
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sty command
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sty jumpAddressLo ;$01 of $0801 where boot code starts
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jsr knownRts ;jump to known RTS to get our address from the stack
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tsx
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sty buflo
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sty blklo
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sty blkhi
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iny ;set command = 1 for read block
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sty command
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jsr knownRts ;jump to known RTS to get our address from the stack
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tsx
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lda $0100,x ;this for example would be $C7 in slot 7
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sta bufhi ;keep the slot here
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asl
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asl
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asl
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asl
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tax
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sta unit
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;display copyright message
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ldy #<text
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drawtxt:
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lda (buflo),y
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beq boot
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sta $07D0-<text,y ;put text on last line
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iny
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bne drawtxt
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sta $07D0-<text,y ;put text on last line
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iny
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bne drawtxt
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;load block 0000 at $0800
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boot:
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lda #$08
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sta bufhi
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sta jumpAddressHi
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stx unit
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bne start
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lda #$08 ;push $0800 onto the stack so an RTS will run at $0801
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sta bufhi
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pha
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lda #$00
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pha
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;This is the ProDOS entry point for this card
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entry:
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lda #<knownRts
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sta jumpAddressLo
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lda #>knownRts
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sta jumpAddressHi
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start:
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lda #$C0
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sta ioAddressHi
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jsr knownRts
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tsx
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lda $0100,x
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asl a
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asl a
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asl a
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asl a
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tax
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cpx unit ;make sure same as ProDOS
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beq docmd ;yep, do command
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sec ;nope, set device not connected
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lda #nodev
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rts ;go back to ProDOS
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ldx unit ;make sure it's drive 1
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bpl docmd ;yep, do command
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sec ;nope, set device not connected
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lda #nodev
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rts ;go back to ProDOS
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docmd:
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lda command
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beq getstat ;command 0 is GetStatus
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cmp #$01
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beq readblk ;command 1 is ReadBlock
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sec ;Format/Write not permitted
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lda #wperr ;write protect error
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rts ;go back to ProDOS
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lda command
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beq getstat ;command 0 is GetStatus
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cmp #$01
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beq readblk ;command 1 is ReadBlock
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sec ;Format/Write not permitted
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lda #wperr ;write protect error
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rts ;go back to ProDOS
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getstat:
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clc ;send back status
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lda #$00 ;good status
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ldx #$00 ;1024 blocks
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ldy #$04 ;
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rts
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clc ;send back status
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lda #$00 ;good status
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ldx #$00 ;1024 blocks
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ldy #$04 ;
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rts
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readblk:
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lda blkhi ;get hi block
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asl a ;shift up to top 3 bits
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asl a ;since that's all the high
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asl a ;blocks we can handle
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asl a ;
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asl a ;
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sta highLatch ;save it in scratch ram 0
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;so we can stuff it in the
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;high latch later
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lda blklo ;get low block
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lsr a ;shift so we get the top 5
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lsr a ;bits - this also goes in
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lsr a ;the high latch
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ora highLatch ;add it to those top 3 bits
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lda ioAddressLo
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pha
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lda ioAddressHi
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pha
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lda tempY
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pha
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lda blockHalfCounter
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pha
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lda lowLatch
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pha
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lda highLatch
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pha
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lda blkhi ;get hi block
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asl a ;shift up to top 3 bits
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asl a ;since that's all the high
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asl a ;blocks we can handle
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asl a ;
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asl a ;
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sta highLatch
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lda blklo ;get low block
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lsr a ;shift so we get the top 5
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lsr a ;bits - this also goes in
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lsr a ;the high latch
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ora highLatch ;add it to those top 3 bits
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sta highLatch ;save it back in scratch ram
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lda blklo ;get low block
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asl a ;shift it to top 3 bits
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asl a ;
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asl a ;
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asl a ;
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asl a ;
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sta lowLatch
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lda #$02
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sta blockHalfCounter
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sta writeLatchHigh,x ;set high latch for card
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lda blklo ;get low block
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asl a ;shift it to top 3 bits
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asl a ;
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asl a ;
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asl a ;
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asl a ;
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sta lowLatch
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lda #$02
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sta blockHalfCounter
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lda #$C0
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sta ioAddressHi
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;This gets 256 bytes from the ROM card
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read256:
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ldy #$00
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lda highLatch ;get high latch value
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sta writeLatchHigh,x ;set high latch for card
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ldy #$00
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loop256:
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lda lowLatch
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sta writeLatchLow,x
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txa
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ora #$80
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sta ioAddressLo
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lda lowLatch
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sta writeLatchLow,x
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txa
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ora #$80
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sta ioAddressLo
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loop16:
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sty tempY
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ldy #$00
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lda (ioAddressLo),y
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ldy tempY
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sta (buflo),y
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iny
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inc ioAddressLo
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lda ioAddressLo
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and #$0F
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bne loop16
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inc lowLatch
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cpy #$00
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bne loop256
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dec blockHalfCounter
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bne readnext256
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dec bufhi
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clc ;clear error code for success
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lda #$00
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jmp (jumpAddressLo)
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sty tempY
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ldy #$00
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lda (ioAddressLo),y
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ldy tempY
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sta (buflo),y
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iny
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inc ioAddressLo
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lda ioAddressLo
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and #$0F
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bne loop16
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continue256:
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inc lowLatch
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cpy #$00
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bne loop256
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dec blockHalfCounter
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bne readnext256
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finish:
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pla
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sta highLatch
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pla
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sta lowLatch
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pla
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sta blockHalfCounter
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pla
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sta tempY
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pla
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sta ioAddressHi
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pla
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sta ioAddressLo
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dec bufhi
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clc ;clear error code for success
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lda #$00
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rts
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readnext256:
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inc bufhi
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clc
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inc bufhi ; set buffer to receive next 256 bytes
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clc ; effectively a branch always
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bcc read256
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;macro for string with high-bit set
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Binary file not shown.
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@ -6,12 +6,6 @@ Current file: Firmware.asm
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000000r 1 writeLatchHigh = $C081
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000000r 1 writeLatchLow = $C080
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000000r 1
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000000r 1 ;temp variables becasue 6502 only has 3 registers
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000000r 1 highLatch = $F8
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000000r 1 lowLatch = $F9
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000000r 1 tempY = $FE
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000000r 1 blockHalfCounter = $FF
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000000r 1
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000000r 1 ;ProDOS defines
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000000r 1 command = $42 ;ProDOS command
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000000r 1 unit = $43 ;7=drive 6-4=slot 3-0=not used
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@ -23,191 +17,205 @@ Current file: Firmware.asm
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000000r 1 nodev = $28 ;no device connected
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000000r 1 wperr = $2B ;write protect error
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000000r 1
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000000r 1 ;for relocatable code, address to jump to instead of JSR absolute + RTS
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000000r 1 jumpAddressLo = $FA
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000000r 1 jumpAddressHi = $FB
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000000r 1 ioAddressLo = $FC
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000000r 1 ioAddressHi = $FD
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000000r 1 knownRts = $FF58
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000000r 1 ;for relocatable code
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000000r 1 ioAddressLo = $FA
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000000r 1 ioAddressHi = $FB
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000000r 1 tempY = $FC
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000000r 1 blockHalfCounter = $FD
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000000r 1 lowLatch = $FE
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000000r 1 highLatch = $FF
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000000r 1 knownRts = $FF58
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000000r 1
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000000r 1 .org $C700
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000000r 1 .org $C700
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00C700 1 ;code is relocatable
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00C700 1 ; but set to $c700 for
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00C700 1 ; readability
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00C700 1
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00C700 1 ;ID bytes for booting and drive detection
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00C700 1 E0 20 cpx #$20 ;ID bytes for ProDOS and the
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00C702 1 A0 00 ldy #$00 ; Apple Autostart ROM
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00C704 1 E0 03 cpx #$03 ;
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00C706 1 E0 3C cpx #$3C ;this one for older II's
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00C700 1 E0 20 cpx #$20 ;ID bytes for ProDOS and the
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00C702 1 A0 00 ldy #$00 ; Apple Autostart ROM
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00C704 1 E0 03 cpx #$03 ;
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00C706 1 E0 3C cpx #$3C ;this one for older II's
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00C708 1
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00C708 1 ;zero out block numbers and buffer address
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00C708 1 84 44 sty buflo
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00C70A 1 84 46 sty blklo
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00C70C 1 84 47 sty blkhi
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00C70E 1 C8 iny ;set command = 1 for read block
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00C70F 1 84 42 sty command
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00C711 1 84 FA sty jumpAddressLo ;$01 of $0801 where boot code starts
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00C713 1 20 58 FF jsr knownRts ;jump to known RTS to get our address from the stack
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00C716 1 BA tsx
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00C717 1 BD 00 01 lda $0100,x ;this for example would be $C7 in slot 7
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00C71A 1 85 45 sta bufhi ;keep the slot here
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00C708 1 84 44 sty buflo
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00C70A 1 84 46 sty blklo
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00C70C 1 84 47 sty blkhi
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00C70E 1 C8 iny ;set command = 1 for read block
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00C70F 1 84 42 sty command
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00C711 1 20 58 FF jsr knownRts ;jump to known RTS to get our address from the stack
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00C714 1 BA tsx
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00C715 1 BD 00 01 lda $0100,x ;this for example would be $C7 in slot 7
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00C718 1 85 45 sta bufhi ;keep the slot here
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00C71A 1 0A asl
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00C71B 1 0A asl
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00C71C 1 0A asl
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00C71D 1 0A asl
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00C71E 1 0A asl
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00C71F 1 0A asl
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00C720 1 AA tax
|
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00C721 1
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00C721 1 ;display copyright message
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00C721 1 A0 C5 ldy #<text
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00C723 1 drawtxt:
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00C723 1 B1 44 lda (buflo),y
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00C725 1 F0 06 beq boot
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00C727 1 99 0B 07 sta $07D0-<text,y ;put text on last line
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00C72A 1 C8 iny
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00C72B 1 D0 F6 bne drawtxt
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00C72D 1
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00C72D 1 ;load block 0000 at $0800
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00C72D 1 boot:
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00C72D 1 A9 08 lda #$08
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00C72F 1 85 45 sta bufhi
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00C731 1 85 FB sta jumpAddressHi
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00C733 1 86 43 stx unit
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00C735 1 D0 08 bne start
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00C737 1 ;This is the ProDOS entry point for this card
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00C737 1 entry:
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00C737 1 A9 58 lda #<knownRts
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00C739 1 85 FA sta jumpAddressLo
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00C73B 1 A9 FF lda #>knownRts
|
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00C73D 1 85 FB sta jumpAddressHi
|
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00C73F 1 start:
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00C73F 1 A9 C0 lda #$C0
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00C741 1 85 FD sta ioAddressHi
|
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00C743 1 20 58 FF jsr knownRts
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00C746 1 BA tsx
|
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00C747 1 BD 00 01 lda $0100,x
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00C74A 1 0A asl a
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00C74B 1 0A asl a
|
||||
00C74C 1 0A asl a
|
||||
00C74D 1 0A asl a
|
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00C74E 1 AA tax
|
||||
00C74F 1 E4 43 cpx unit ;make sure same as ProDOS
|
||||
00C751 1 F0 04 beq docmd ;yep, do command
|
||||
00C753 1 38 sec ;nope, set device not connected
|
||||
00C754 1 A9 28 lda #nodev
|
||||
00C756 1 60 rts ;go back to ProDOS
|
||||
00C757 1
|
||||
00C757 1 docmd:
|
||||
00C757 1 A5 42 lda command
|
||||
00C759 1 F0 08 beq getstat ;command 0 is GetStatus
|
||||
00C75B 1 C9 01 cmp #$01
|
||||
00C75D 1 F0 0C beq readblk ;command 1 is ReadBlock
|
||||
00C75F 1 38 sec ;Format/Write not permitted
|
||||
00C760 1 A9 2B lda #wperr ;write protect error
|
||||
00C762 1 60 rts ;go back to ProDOS
|
||||
00C763 1
|
||||
00C763 1 getstat:
|
||||
00C763 1 18 clc ;send back status
|
||||
00C764 1 A9 00 lda #$00 ;good status
|
||||
00C766 1 A2 00 ldx #$00 ;1024 blocks
|
||||
00C768 1 A0 04 ldy #$04 ;
|
||||
00C76A 1 60 rts
|
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00C76B 1
|
||||
00C76B 1 readblk:
|
||||
00C76B 1 A5 47 lda blkhi ;get hi block
|
||||
00C76D 1 0A asl a ;shift up to top 3 bits
|
||||
00C76E 1 0A asl a ;since that's all the high
|
||||
00C76F 1 0A asl a ;blocks we can handle
|
||||
00C770 1 0A asl a ;
|
||||
00C771 1 0A asl a ;
|
||||
00C772 1 85 F8 sta highLatch ;save it in scratch ram 0
|
||||
00C774 1 ;so we can stuff it in the
|
||||
00C774 1 ;high latch later
|
||||
00C774 1 A5 46 lda blklo ;get low block
|
||||
00C776 1 4A lsr a ;shift so we get the top 5
|
||||
00C777 1 4A lsr a ;bits - this also goes in
|
||||
00C778 1 4A lsr a ;the high latch
|
||||
00C779 1 05 F8 ora highLatch ;add it to those top 3 bits
|
||||
00C77B 1 85 F8 sta highLatch ;save it back in scratch ram
|
||||
00C77D 1 A5 46 lda blklo ;get low block
|
||||
00C77F 1 0A asl a ;shift it to top 3 bits
|
||||
00C780 1 0A asl a ;
|
||||
00C781 1 0A asl a ;
|
||||
00C782 1 0A asl a ;
|
||||
00C783 1 0A asl a ;
|
||||
00C784 1 85 F9 sta lowLatch
|
||||
00C786 1 A9 02 lda #$02
|
||||
00C788 1 85 FF sta blockHalfCounter
|
||||
00C78A 1
|
||||
00C78A 1 ;This gets 256 bytes from the ROM card
|
||||
00C78A 1
|
||||
00C78A 1 read256:
|
||||
00C78A 1 A0 00 ldy #$00
|
||||
00C78C 1 A5 F8 lda highLatch ;get high latch value
|
||||
00C78E 1 9D 81 C0 sta writeLatchHigh,x ;set high latch for card
|
||||
00C791 1 loop256:
|
||||
00C791 1 A5 F9 lda lowLatch
|
||||
00C793 1 9D 80 C0 sta writeLatchLow,x
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||||
00C796 1 8A txa
|
||||
00C797 1 09 80 ora #$80
|
||||
00C799 1 85 FC sta ioAddressLo
|
||||
00C79B 1 loop16:
|
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00C79B 1 84 FE sty tempY
|
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00C79D 1 A0 00 ldy #$00
|
||||
00C79F 1 B1 FC lda (ioAddressLo),y
|
||||
00C7A1 1 A4 FE ldy tempY
|
||||
00C7A3 1 91 44 sta (buflo),y
|
||||
00C7A5 1 C8 iny
|
||||
00C7A6 1 E6 FC inc ioAddressLo
|
||||
00C7A8 1 A5 FC lda ioAddressLo
|
||||
00C7AA 1 29 0F and #$0F
|
||||
00C7AC 1 D0 ED bne loop16
|
||||
00C7AE 1 E6 F9 inc lowLatch
|
||||
00C7B0 1 C0 00 cpy #$00
|
||||
00C7B2 1 D0 DD bne loop256
|
||||
00C7B4 1 C6 FF dec blockHalfCounter
|
||||
00C7B6 1 D0 08 bne readnext256
|
||||
00C7B8 1 C6 45 dec bufhi
|
||||
00C7BA 1 18 clc ;clear error code for success
|
||||
00C7BB 1 A9 00 lda #$00
|
||||
00C7BD 1 6C FA 00 jmp (jumpAddressLo)
|
||||
00C7C0 1
|
||||
00C7C0 1 readnext256:
|
||||
00C7C0 1 E6 45 inc bufhi
|
||||
00C7C2 1 18 clc
|
||||
00C7C3 1 90 C5 bcc read256
|
||||
00C7C5 1
|
||||
00C7C5 1 ;macro for string with high-bit set
|
||||
00C7C5 1 .macro aschi str
|
||||
00C7C5 1 .repeat .strlen (str), c
|
||||
00C7C5 1 .byte .strat (str, c) | $80
|
||||
00C7C5 1 .endrep
|
||||
00C7C5 1 .endmacro
|
||||
00C7C5 1
|
||||
00C7C5 1 D2 CF CD AD text: aschi "ROM-Drive (c)1998-2022 Terence J. Boldt"
|
||||
00C7C9 1 C4 F2 E9 F6
|
||||
00C7CD 1 E5 A0 A8 E3
|
||||
00C7D1 1 A9 B1 B9 B9
|
||||
00C7D5 1 B8 AD B2 B0
|
||||
00C7D9 1 B2 B2 A0 D4
|
||||
00C7DD 1 E5 F2 E5 EE
|
||||
00C7E1 1 E3 E5 A0 CA
|
||||
00C7E5 1 AE A0 C2 EF
|
||||
00C7E9 1 EC E4 F4
|
||||
00C7EC 1 end:
|
||||
00C7EC 1 00 .byte 0
|
||||
00C7ED 1
|
||||
00C7ED 1 ; These bytes need to be at the top of the 256 byte firmware as ProDOS
|
||||
00C7ED 1 ; uses these to find the entry point and drive capabilities
|
||||
00C7ED 1
|
||||
00C7ED 1 00 00 00 00 .repeat 251-<end
|
||||
00C7F1 1 00 00 00 00
|
||||
00C7F5 1 00 00 00 00
|
||||
00C7F9 1 00 00 00
|
||||
00C71E 1 85 43 sta unit
|
||||
00C720 1
|
||||
00C720 1 ;display copyright message
|
||||
00C720 1 A0 CE ldy #<text
|
||||
00C722 1 drawtxt:
|
||||
00C722 1 B1 44 lda (buflo),y
|
||||
00C724 1 F0 06 beq boot
|
||||
00C726 1 99 02 07 sta $07D0-<text,y ;put text on last line
|
||||
00C729 1 C8 iny
|
||||
00C72A 1 D0 F6 bne drawtxt
|
||||
00C72C 1
|
||||
00C72C 1 ;load block 0000 at $0800
|
||||
00C72C 1 boot:
|
||||
00C72C 1 A9 08 lda #$08 ;push $0800 onto the stack so an RTS will run at $0801
|
||||
00C72E 1 85 45 sta bufhi
|
||||
00C730 1 48 pha
|
||||
00C731 1 A9 00 lda #$00
|
||||
00C733 1 48 pha
|
||||
00C734 1 ;This is the ProDOS entry point for this card
|
||||
00C734 1 entry:
|
||||
00C734 1 A6 43 ldx unit ;make sure it's drive 1
|
||||
00C736 1 10 04 bpl docmd ;yep, do command
|
||||
00C738 1 38 sec ;nope, set device not connected
|
||||
00C739 1 A9 28 lda #nodev
|
||||
00C73B 1 60 rts ;go back to ProDOS
|
||||
00C73C 1
|
||||
00C73C 1 docmd:
|
||||
00C73C 1 A5 42 lda command
|
||||
00C73E 1 F0 08 beq getstat ;command 0 is GetStatus
|
||||
00C740 1 C9 01 cmp #$01
|
||||
00C742 1 F0 0C beq readblk ;command 1 is ReadBlock
|
||||
00C744 1 38 sec ;Format/Write not permitted
|
||||
00C745 1 A9 2B lda #wperr ;write protect error
|
||||
00C747 1 60 rts ;go back to ProDOS
|
||||
00C748 1
|
||||
00C748 1 getstat:
|
||||
00C748 1 18 clc ;send back status
|
||||
00C749 1 A9 00 lda #$00 ;good status
|
||||
00C74B 1 A2 00 ldx #$00 ;1024 blocks
|
||||
00C74D 1 A0 04 ldy #$04 ;
|
||||
00C74F 1 60 rts
|
||||
00C750 1
|
||||
00C750 1 readblk:
|
||||
00C750 1 A5 FA lda ioAddressLo
|
||||
00C752 1 48 pha
|
||||
00C753 1 A5 FB lda ioAddressHi
|
||||
00C755 1 48 pha
|
||||
00C756 1 A5 FC lda tempY
|
||||
00C758 1 48 pha
|
||||
00C759 1 A5 FD lda blockHalfCounter
|
||||
00C75B 1 48 pha
|
||||
00C75C 1 A5 FE lda lowLatch
|
||||
00C75E 1 48 pha
|
||||
00C75F 1 A5 FF lda highLatch
|
||||
00C761 1 48 pha
|
||||
00C762 1
|
||||
00C762 1 A5 47 lda blkhi ;get hi block
|
||||
00C764 1 0A asl a ;shift up to top 3 bits
|
||||
00C765 1 0A asl a ;since that's all the high
|
||||
00C766 1 0A asl a ;blocks we can handle
|
||||
00C767 1 0A asl a ;
|
||||
00C768 1 0A asl a ;
|
||||
00C769 1 85 FF sta highLatch
|
||||
00C76B 1 A5 46 lda blklo ;get low block
|
||||
00C76D 1 4A lsr a ;shift so we get the top 5
|
||||
00C76E 1 4A lsr a ;bits - this also goes in
|
||||
00C76F 1 4A lsr a ;the high latch
|
||||
00C770 1 05 FF ora highLatch ;add it to those top 3 bits
|
||||
00C772 1 85 FF sta highLatch ;save it back in scratch ram
|
||||
00C774 1 9D 81 C0 sta writeLatchHigh,x ;set high latch for card
|
||||
00C777 1 A5 46 lda blklo ;get low block
|
||||
00C779 1 0A asl a ;shift it to top 3 bits
|
||||
00C77A 1 0A asl a ;
|
||||
00C77B 1 0A asl a ;
|
||||
00C77C 1 0A asl a ;
|
||||
00C77D 1 0A asl a ;
|
||||
00C77E 1 85 FE sta lowLatch
|
||||
00C780 1 A9 02 lda #$02
|
||||
00C782 1 85 FD sta blockHalfCounter
|
||||
00C784 1 A9 C0 lda #$C0
|
||||
00C786 1 85 FB sta ioAddressHi
|
||||
00C788 1
|
||||
00C788 1 ;This gets 256 bytes from the ROM card
|
||||
00C788 1
|
||||
00C788 1 read256:
|
||||
00C788 1 A0 00 ldy #$00
|
||||
00C78A 1 loop256:
|
||||
00C78A 1 A5 FE lda lowLatch
|
||||
00C78C 1 9D 80 C0 sta writeLatchLow,x
|
||||
00C78F 1 8A txa
|
||||
00C790 1 09 80 ora #$80
|
||||
00C792 1 85 FA sta ioAddressLo
|
||||
00C794 1
|
||||
00C794 1 loop16:
|
||||
00C794 1 84 FC sty tempY
|
||||
00C796 1 A0 00 ldy #$00
|
||||
00C798 1 B1 FA lda (ioAddressLo),y
|
||||
00C79A 1 A4 FC ldy tempY
|
||||
00C79C 1 91 44 sta (buflo),y
|
||||
00C79E 1 C8 iny
|
||||
00C79F 1 E6 FA inc ioAddressLo
|
||||
00C7A1 1 A5 FA lda ioAddressLo
|
||||
00C7A3 1 29 0F and #$0F
|
||||
00C7A5 1 D0 ED bne loop16
|
||||
00C7A7 1
|
||||
00C7A7 1 continue256:
|
||||
00C7A7 1 E6 FE inc lowLatch
|
||||
00C7A9 1 C0 00 cpy #$00
|
||||
00C7AB 1 D0 DD bne loop256
|
||||
00C7AD 1 C6 FD dec blockHalfCounter
|
||||
00C7AF 1 D0 18 bne readnext256
|
||||
00C7B1 1
|
||||
00C7B1 1 finish:
|
||||
00C7B1 1 68 pla
|
||||
00C7B2 1 85 FF sta highLatch
|
||||
00C7B4 1 68 pla
|
||||
00C7B5 1 85 FE sta lowLatch
|
||||
00C7B7 1 68 pla
|
||||
00C7B8 1 85 FD sta blockHalfCounter
|
||||
00C7BA 1 68 pla
|
||||
00C7BB 1 85 FC sta tempY
|
||||
00C7BD 1 68 pla
|
||||
00C7BE 1 85 FB sta ioAddressHi
|
||||
00C7C0 1 68 pla
|
||||
00C7C1 1 85 FA sta ioAddressLo
|
||||
00C7C3 1
|
||||
00C7C3 1 C6 45 dec bufhi
|
||||
00C7C5 1 18 clc ;clear error code for success
|
||||
00C7C6 1 A9 00 lda #$00
|
||||
00C7C8 1 60 rts
|
||||
00C7C9 1
|
||||
00C7C9 1 readnext256:
|
||||
00C7C9 1 E6 45 inc bufhi ; set buffer to receive next 256 bytes
|
||||
00C7CB 1 18 clc ; effectively a branch always
|
||||
00C7CC 1 90 BA bcc read256
|
||||
00C7CE 1
|
||||
00C7CE 1 ;macro for string with high-bit set
|
||||
00C7CE 1 .macro aschi str
|
||||
00C7CE 1 .repeat .strlen (str), c
|
||||
00C7CE 1 .byte .strat (str, c) | $80
|
||||
00C7CE 1 .endrep
|
||||
00C7CE 1 .endmacro
|
||||
00C7CE 1
|
||||
00C7CE 1 D2 CF CD AD text: aschi "ROM-Drive (c)1998-2022 Terence J. Boldt"
|
||||
00C7D2 1 C4 F2 E9 F6
|
||||
00C7D6 1 E5 A0 A8 E3
|
||||
00C7DA 1 A9 B1 B9 B9
|
||||
00C7DE 1 B8 AD B2 B0
|
||||
00C7E2 1 B2 B2 A0 D4
|
||||
00C7E6 1 E5 F2 E5 EE
|
||||
00C7EA 1 E3 E5 A0 CA
|
||||
00C7EE 1 AE A0 C2 EF
|
||||
00C7F2 1 EC E4 F4
|
||||
00C7F5 1 end:
|
||||
00C7F5 1 00 .byte 0
|
||||
00C7F6 1
|
||||
00C7F6 1 ; These bytes need to be at the top of the 256 byte firmware as ProDOS
|
||||
00C7F6 1 ; uses these to find the entry point and drive capabilities
|
||||
00C7F6 1
|
||||
00C7F6 1 00 00 00 00 .repeat 251-<end
|
||||
00C7FA 1 00 00
|
||||
00C7FC 1 .byte 0
|
||||
00C7FC 1 .endrepeat
|
||||
00C7FC 1
|
||||
00C7FC 1 00 00 .byte 0,0 ;0000 blocks = check status
|
||||
00C7FE 1 03 .byte 3 ;bit 0=read 1=status
|
||||
00C7FF 1 37 .byte <entry ;low byte of entry
|
||||
00C7FF 1 34 .byte <entry ;low byte of entry
|
||||
00C7FF 1
|
||||
|
|
|
|||
Binary file not shown.
Loading…
Reference in New Issue