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- Original Document: Mathew Lodge
- Edited/modified: Peter A. Ritchie
-
- PAR: Having an STe with 2Meg I decided to find this rumoured program.
- Since the source was included I decided to take a look at it.
- As it turns out, the MMU is not at fault; it recognises the 2.5Meg
- and configures itself accordingly. It's the OS that doesn't
- configure itself te right way. And that's just a matter of setting
- top of RAM to 2.5Meg.
-
- 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.
- PAR: It actually tells TOS to recognise what the MMU has been _trying_
- to tell it!
-
- 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)*
-
- PAR: Since my HD program has to load before any AUTO programs I
- decided to see if it REALLY needed to be first. Well, it doesn't
- It would have to be BEFORE any ramdisk programs, just in case!
-
- 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).
-
- PAR: The Reboot turned out to be not-necessary. So, I took it out.
- 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.
-
- ------ 91-04
- PAR: I found it from GEnie; looked it over and made some of my own changes
- for obvious reasons. Works find for me!
-
- Peter A. Ritchie
- c/o Blue Turtle Software
- Box 4916 Station 'E'
- Ottawa, Ontario
- K1S 5J1
- Canada
-
- GEnie: P.RITCHIE
- ------
-
- Mathew Lodge
-
- 5 May 1990
-
-
-
- (JANET address : SOCS18 @ uk.ac.york.vaxa)
-
-