Update assembler code to work with modern version of cc65 tools
This commit is contained in:
Terence Boldt
parent
336615f3af
commit
9667fda1e4
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@ -3,59 +3,69 @@
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;This allows the card to work in any slot without
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;having to write space consuming relocatable code.
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;Install cc65 (on Ubuntu this is: sudo apt install cc65)
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;Execute the following commands to generate the binary:
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;ca65 Firmware.asm -D SLOT1 -o slot1.o
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;ca65 Firmware.asm -D SLOT2 -o slot2.o
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;ca65 Firmware.asm -D SLOT3 -o slot3.o
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;ca65 Firmware.asm -D SLOT4 -o slot4.o
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;ca65 Firmware.asm -D SLOT5 -o slot5.o
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;ca65 Firmware.asm -D SLOT6 -o slot6.o
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;ca65 Firmware.asm -D SLOT7 -o slot7.o
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;ld65 -t none slot1.o slot2.o slot3.o slot4.o slot5.o slot6.o slot7.o -o Firmware.bin
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;Determine which slot we want by command-line define
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if SLOT1
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slot equ $01
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endif
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if SLOT2
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slot equ $02
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endif
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if SLOT3
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slot equ $03
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endif
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if SLOT4
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slot equ $04
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endif
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if SLOT5
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slot equ $05
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endif
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if SLOT6
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slot equ $06
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endif
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if SLOT7
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slot equ $07
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endif
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.ifdef SLOT1
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slot = $01
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.endif
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.ifdef SLOT2
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slot = $02
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.endif
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.ifdef SLOT3
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slot = $03
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.endif
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.ifdef SLOT4
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slot = $04
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.endif
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.ifdef SLOT5
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slot = $05
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.endif
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.ifdef SLOT6
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slot = $06
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.endif
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.ifdef SLOT7
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slot = $07
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.endif
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;Calculate I/O addresses for this slot
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slotwh equ $C081+slot*$10
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slotwl equ $C080+slot*$10
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slotrd equ $C080+slot*$10
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sdrive equ slot*$10
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slotwh = $C081+slot*$10
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slotwl = $C080+slot*$10
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slotrd = $C080+slot*$10
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sdrive = slot*$10
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sram0 equ $478+slot
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sram1 equ $4F8+slot
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sram2 equ $578+slot
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sram3 equ $5F8+slot
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sram4 equ $678+slot
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sram5 equ $6F8+slot
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sram6 equ $778+slot
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sram7 equ $7F8+slot
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sram0 = $478+slot
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sram1 = $4F8+slot
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sram2 = $578+slot
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sram3 = $5F8+slot
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sram4 = $678+slot
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sram5 = $6F8+slot
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sram6 = $778+slot
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sram7 = $7F8+slot
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;ProDOS defines
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command equ $42 ;ProDOS command
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unit equ $43 ;7=drive 6-4=slot 3-0=not used
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buflo equ $44 ;low address of buffer
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bufhi equ $45 ;hi address of buffer
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blklo equ $46 ;low block
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blkhi equ $47 ;hi block
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ioerr equ $27 ;I/O error code
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nodev equ $28 ;no device connected
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wperr equ $2B ;write protect error
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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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buflo = $44 ;low address of buffer
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bufhi = $45 ;hi address of buffer
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blklo = $46 ;low block
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blkhi = $47 ;hi block
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ioerr = $27 ;I/O error code
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nodev = $28 ;no device connected
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wperr = $2B ;write protect error
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org $C000+slot*$100
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.org $C000+slot*$100
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;code is non-relocatable
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; but duplicated seven times,
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; once for each slot
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@ -68,7 +78,7 @@ wperr equ $2B ;write protect error
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;display copyright message
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ldy #$00
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drawtxt lda text,y
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drawtxt: lda text,y
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beq boot ;check for NULL
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ora #$80 ;make it visible to the Apple
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sta $07D0,y ;put text on last line
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@ -76,7 +86,7 @@ drawtxt lda text,y
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bpl drawtxt
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;load first two blocks and execute to boot
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boot lda #$01 ;set read command
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boot: lda #$01 ;set read command
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sta command
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lda #sdrive ;set slot and unit
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sta unit
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@ -101,14 +111,14 @@ boot lda #$01 ;set read command
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jmp $801 ;execute the block
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;This is the ProDOS entry point for this card
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entry lda #sdrive ;unit number is $n0 - n = slot
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entry: lda #sdrive ;unit number is $n0 - n = slot
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cmp 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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docmd lda command ;get ProDOS command
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docmd: lda command ;get ProDOS 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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@ -116,13 +126,13 @@ docmd lda command ;get ProDOS command
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lda #wperr ;write protect error
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rts ;go back to ProDOS
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getstat clc ;send back status
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getstat: 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 lda blkhi ;get hi block
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readblk: 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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@ -165,15 +175,15 @@ readblk lda blkhi ;get hi block
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;This gets 256 bytes from the ROM card
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;assuming high latch value is in sram0
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;and low latch value is in sram1
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get256 ldy #$00 ;clear buffer counter
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get256: ldy #$00 ;clear buffer counter
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lda sram0 ;get high latch value
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sta slotwh ;set high latch for card
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loop256 ldx #$00 ;clear port counter
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loop256: ldx #$00 ;clear port counter
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lda sram1 ;get low latch value
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sta slotwl ;set low latch
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loop16 lda slotrd,x ;get a byte
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loop16: lda slotrd,x ;get a byte
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sta (buflo),y ;write into the buffer
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iny
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inx
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@ -186,10 +196,19 @@ loop16 lda slotrd,x ;get a byte
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rts
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text db "ROM-Drive (c)1998-2019 Terence J. Boldt", 0
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text: .byte "ROM-Drive (c)1998-2019 Terence J. Boldt", 0
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org $C0FC+slot*$100
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db 0,0 ;0000 blocks = check status
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db 3 ;bit 0=read 1=status
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db entry&$00FF ;low byte of entry
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; These bytes need to be at the top of the 256 byte firmware as ProDOS
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; uses these to find the entry point and drive capabilities
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; In 1998, cc65 used to allow this but now with ld65 removes the padded bytes
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; .org $C0FC+slot*$100
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; CAUTION: These are padding bytes entered manually, add or remove
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; to match if changing code. Firmware must be 256 bytes
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.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.byte 0,0 ;0000 blocks = check status
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.byte 3 ;bit 0=read 1=status
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.byte entry&$00FF ;low byte of entry
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Binary file not shown.
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@ -0,0 +1 @@
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.byte "Do not overwrite any of blocks after this point as it is used for the firmware. There are 7 copies of the 256 byte firmware, one for each slot due to 6502 code being non-relocatable. Have fun and feel free to improve on the hardware / sofware. --- Terence"
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@ -0,0 +1,10 @@
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#!/bin/sh
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ca65 Warning.asm -o warning.o
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ca65 Firmware.asm -D SLOT1 -o slot1.o
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ca65 Firmware.asm -D SLOT2 -o slot2.o
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ca65 Firmware.asm -D SLOT3 -o slot3.o
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ca65 Firmware.asm -D SLOT4 -o slot4.o
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ca65 Firmware.asm -D SLOT5 -o slot5.o
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ca65 Firmware.asm -D SLOT6 -o slot6.o
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ca65 Firmware.asm -D SLOT7 -o slot7.o
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ld65 -t none warning.o slot1.o slot2.o slot3.o slot4.o slot5.o slot6.o slot7.o -o Firmware.bin
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