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Atari STE SIMM mixer by David Hoggan

Lets STE configure 2.5 Megs properly

atari's profile picture
Published in 
atari
 · 17 Mar 2021

  
* STE SIMM mixer by David Hoggan
* Lets STE configure 2.5 Megs properly
* MUST BE FIRST IN AUTO FOLDER!

* This program asssumes 2Mb in bank 0 and 0.5Mb 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 --|
* |-- .5meg SIMM --|
* |-- 1meg SIMM --|
* |-- .5meg SIMM --|
*
* (front of STE)

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
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
clr.w -(sp) Back to TOS
trap #1


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