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Atari Mega Archive 1
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Atari Mega Archive - Volume 1.iso
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ste
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simmfix.zoo
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simmfix.asm
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Assembly Source File
|
1990-09-10
|
3KB
|
90 lines
****************************************************************
* STE SIMM MIXER *
****************************************************************
* Author : David Hoggan *
* Version : 1.0.1 *
* Additions : Mathew Lodge *
* Release date : 5/5/90 *
****************************************************************
*
* This program was submitted to the "Programmer's Clinic" section
* of ST World (the premier UK ST magazine).
*
* Additions made for USENET release by Mathew Lodge
*
* This program is public domain. Please give it to anybody who
* asks for it.
*
* This program fixes a bug in TOS 1.6 and properly configures the
* MMU for 2.5 Megabytes of memory.
*
*****************************************************************
* Important! : MUST BE FIRST IN AUTO FOLDER!
*
* You can't run any other program before this one - it will crash
*
*****************************************************************
*
* Note:
*
* This program asssumes 2M in bank0 and 0.5M in bank 1
* It has been found that the other way around doesn't work
* - the MMU configures to a 1MB machine.
*
* Install your SIMMs as follows:
*
* (back of STE)
*
* |-- 1meg SIMM --|
* |-- 256K SIMM --|
* |-- 1meg SIMM --|
* |-- 256K SIMM --|
*
* (front of STE)
*
start:
clr.l -(sp)
move.w #32,-(sp) Switch to super mode
trap #1
addq.l #6,sp
cmp.l #$280000,$42E RAM <= 2.5 megs?
ble already If so, nothing to do
cmp.b #9,$424 Is it installed properly?
bne already If so, nothing to do
move.l #$280000,$42E Set phystop
ST_reset:
move.l $4F2,a0 Find reset address
jmp (a0) Reset system
already:
move.l d0,-(sp) Returned stack
move.w #32,-(sp) Switch back to user mode
trap #1
addq.l #6,sp
lea fixmsg(PC),a0 Print startup message
bsr print
quit
clr.w -(sp) Back to TOS
trap #1
print:
move.l a0,-(sp) Addr of message
move.w #9,-(sp) Cconws
trap #1
addq.l #6,sp tidy
rts return
fixmsg:
dc.b 13,10,27,"p"
dc.b ' The 2.5MB STE SIMM mixer ',27,"q",13,10
dc.b ' Version 1.0.1 ',13,10
dc.b 'Original program : David Hoggan',13,10
dc.b 'Additions : Mathew Lodge',13,10,0
END