home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Atari Mega Archive 1
/
Atari Mega Archive - Volume 1.iso
/
ste
/
simmfix.zoo
/
simmfix.txt
< prev
Wrap
Text File
|
1990-09-10
|
3KB
|
81 lines
The 2.5MB STE SIMM fixer.
=========================
This is a short program that allows you to fit 2.5MB of memory to an STE
by mixing 256K and 1MB SIMMs.
Why it's needed
===============
The reason you can't mix the two types of SIMM is that TOS 1.6 in the STE
fails to recognise this memory configuration and incorrectly programs the
MMU chip. It thinks, in fact, that you have 4MB of memory installed. This
causes big problems as soon as you attempt to run any non-trivial program
(e.g. GEM) The symptoms are that your STE gets stuck in a reset-reboot
cycle.
How it works
============
This program works by reprogramming the MMU and correctly setting _memtop,
and then warm booting the STE.
How to use it
=============
You must fit the SIMMs into your STE in the following order:
** (back of STE)**
|-- 1meg SIMM --|
|-- 256K SIMM --|
|-- 1meg SIMM --|
|-- 256K SIMM --|
** (front of STE)*
Put the SIMMFIX.PRG program _FIRST_ in your auto folder (do this by
deleting everything in the AUTO folder, then copy SIMMFIX.PRG to it, and
then copy everything else back into AUTO).
With SIMMFIX first in your AUTO folder, your ST will start, then reboot,
and should then display a short message detailing the version of SIMMFIX
and the authors names.
From then on all should be well. This program has been extensively tested
by David Hoggan on a wide range of software (though few games were
tested).
Problems
========
Because you have to run SIMMFIX every time you switch on your STE, you
cannot just switch on and insert any autobooting disk (e.g. Dungeon
Master, Starglider II etc. etc.) In these cases, you should make a boot
disk with nothing except an AUTO folder containing SIMMFIX.PRG. Boot with
this disk, and when the desktop appears, remove the disk. Insert the game
disk that you want to autoboot. Then hold down Control, Alt and Delete
together to reset the STE, and the game will boot and run as normal.
Make sure you have (at least) one backup disk containing SIMMFIX.PRG in
the AUTO folder in case anything goes wrong with your boot disk. If you
can't run SIMMFIX, then you'll have to open up your STE and remove the
256K SIMMS, make a new boot disk, and then put them back.
Program History
===============
The SIMMFIX program was submitted to the "Programmer's Clinic" section of
ST World, the premier UK ST magazine, by David Hoggan. I (Mathew Lodge)
made a few additions and wrote this documentation for a posting to USENET.
Mathew Lodge
5 May 1990
(JANET address : SOCS18 @ uk.ac.york.vaxa)