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; 20221210 bkw: reverse-engineered "source" for setmem.xex.
; originally created with da65 (cc65's disassembler), then
; hand-edited to make it (hopefully) more human-readable.
; By default, this builds the original setmem.xex, 877 bytes,
; md5sum f7834eaf50e8b5d5314a20f6a5d83a0d.
; I've added a couple of optional defines:
; reverse_logic - For upgrades that have 256K/compy as the default.
; coldstart - Reboot the Atari instead of exiting to DOS. For use
; with SpartaDOS X, which crashes if we exit to DOS
; after changing the mode.
; See the Makefile for build options.
.include "atari.inc"
.include "xex.inc"
.include "inv.inc"
; 2 byte ZP pointer used for printing text.
msgptr = $cc
; "Magic" hardware register. On an un-upgraded Atari, $d3f3 is just
; a "mirror" of $d303 (aka PBCTL). It's special on the tfhh upgrade
; though: changing it to $d303 here results in a non-functional setmem.xex.
; Also note that writing to $d3f3 only affects the upgrade if the
; Start key is pressed... and even when Start is pressed, writing
; to $d3f3 still changes PBCTL.
magic_register = $d3f3
loadaddress = $3000
xex_org loadaddress
entrypoint:
cld ; unnecessary.
lda #$08
sta CONSOL ; clicks the consol speaker (no idea why).
lda #$00
sta choice ; choice = 0 (but it immediately gets inc'd to 1).
next_choice:
inc choice ; choice++;
lda choice
cmp #$03
bne choice_ok
lda #$00 ; if(choice == 3) choice = 0;
sta choice
choice_ok:
lda #<banner_msg
sta msgptr
lda #>banner_msg
sta msgptr+1
jsr print_msg
lda choice
clc
asl a
asl a
tay ; Y = choice * 4;
lda msg0,y
sta msgptr
lda msg0+1,y
sta msgptr+1
lda magicbits_0,y
sta magic_bits
jsr print_msg
read_consol:
lda CONSOL
and #$07
cmp #$03
beq option_pressed
cmp #$06
beq start_pressed
cmp #$05
bne read_consol
select_pressed:
lda CONSOL
and #$07
cmp #$07
bne select_pressed
beq next_choice
option_pressed:
lda #<no_change_msg
sta msgptr
lda #>no_change_msg
sta msgptr+1
print_and_exit:
jsr print_msg
lda #$00
tax
tay
rts
; apply the current choice to the hardware
start_pressed:
sei ; disable IRQs
lda #$00
sta NMIEN ; disable NMIs
lda magic_register
and #$FC
ora magic_bits
sta magic_register
wait_consol_release:
lda CONSOL
and #$07
cmp #$07
bne wait_consol_release
lda #$40
sta NMIEN ; re-enable NMIs
cli ; re-enable IRQs
.ifdef coldstart
jmp COLDSV
.else
lda #<mode_set_msg ; "Mode was set...."
sta msgptr
lda #>mode_set_msg
sta msgptr+1
jmp print_and_exit
.endif
; print null-terminated ATASCII message pointed to by (msgptr).
print_msg:
lda #$00
tax
tay
sta ICBLL,x
sta ICBLH,x
lda #PUTCHR
sta ICCOM,x
lda msgptr
sta ICBAL,x
lda msgptr+1
sta ICBAH,x
nextchar:
lda (msgptr),y
beq call_cio
iny
bne zptr_hi_ok
inc msgptr+1
zptr_hi_ok:
inc ICBLL,x
bne nextchar
inc ICBLH,x
bne nextchar
call_cio:
jmp CIOV
; R/W data (2 bytes):
choice: .byte $00 ; Currently chosen option (default 1, range 0 to 2).
; This gets set to one of disable_magic, compy_magic, or rambo_magic.
; Bits 0 and 1 will get ORed into magic_register.
magic_bits: .byte $00
; R/O data (rest of file):
disable_magic = $01
.ifdef reverse_logic
compy_magic = $00
rambo_magic = $02
.else
compy_magic = $02
rambo_magic = $00
.endif
; Table of 3 4-byte entries, one per choice. 4th byte is filler (always 0).
msg0: .addr disable_msg
magicbits_0: .byte disable_magic
filler_0: .byte 0
msg1: .addr compy_msg
magicbits_1: .byte compy_magic
filler_1: .byte 0
msg2: .addr rambo_msg
magicbits_2: .byte rambo_magic
filler_2: .byte 0
; Rest of the data is messages to be printed to IOCB#0 by print_msg.
; These are null-terminated.
banner_msg:
.byte CLS
.byte EOL
inverse " Setup tool for tfhh SRAM expansions "
.byte EOL,EOL
.ifdef reverse_logic
inverse "Reverse Logic"
.byte " - This"
.else
.byte "20210614"
.byte " - This tool"
.endif
.byte " works with:"
.byte EOL,EOL
.byte "- 512 KB SRAM memory expansion "
inverse "V4.5"
.byte EOL
.byte " (please check revision number!)"
.byte EOL,EOL
.byte "- 576 KB SRAM memory expansion "
inverse "V2"
.byte EOL
.byte " (only for the Atari 600XL, please"
.byte EOL
.byte " check the presence of "
.byte '"', "V2", '"', " printed", EOL
.byte " on the PCB)"
.byte EOL,EOL
.byte "Use console key "
inverse " SELECT "
.byte " to change"
.byte EOL
.byte "the desired mode, press "
inverse " OPTION "
.byte " to"
.byte EOL
.byte "quit this tool without any change"
.byte EOL
.byte "or press "
inverse " START "
.byte " to setup the SRAM"
.byte EOL
.byte "memory expansion as shown and"
.byte EOL
.ifdef coldstart
inverse "reboot"
.byte " the Atari."
.else
.byte "return to DOS."
.endif
.byte EOL,EOL
.byte "Expansion will be set to: "
.byte EOL,EOL
.byte "==> "
.byte 0
disable_msg:
inverse " Memory Expansion switched off"
.byte 0
compy_msg:
inverse " 256 KByte Compy-Shop/XE mode"
.byte 0
rambo_msg:
inverse " 512 KByte RAMBO mode"
.byte 0
mode_set_msg:
inverse " "
.byte EOL,EOL
.byte "Mode was set. Program terminated."
.byte EOL,EOL,0
no_change_msg:
inverse " "
.byte EOL,EOL
.byte "Nothing changed. Programm terminated."
.byte EOL,EOL,0
xex_run entrypoint
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