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From: twmanino@taco.cc (TONY W MANINO)
Newsgroups: comp.sys.atari.st
Subject: Re: More than 4 Meg ??
Message-ID: <1991Jun7.004215.1721@ncsu.edu>
Date: 7 Jun 91 00:42:15 GMT
Sender: news@ncsu.edu (USENET News System)
Reply-To: twmanino@eos.ncsu.edu
Organization: North Carolina State University
Lines: 30

>>Nope. TOS 1.6 has a screwed up memory sizer that assumes that if two banks of
>>RAM exist then both banks are the same size. I don't know if this is a bug
>>in the true sense or malicious crippling but it is sad.
>>
>>BTW, a bank is two SIMMs since memory access is on a word basis.
>>
>>	512K	= 2 x 256K SIMMs
>>	1Mb	= 4 x 256K SIMMs
>>	2Mb	= 2 x 1Mb SIMMs
>>	2.5Mb	= 2 x 1Mb SIMMs + 2 x 256K SIMMs (Not with TOS 1.6)
>                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>I heard this works on TOS 1.6 if you put the 256k SIMMs as the first bank
>and the 1M SIMMs as the second bank.  But I could be wrong.  If you're
>having trouble, though, it's trivial to try it the other way.
>>	4Mb	= 4 x 1Mb SIMMs

There's a file at atari.archive that fixes the 2.5 meg problem... It's called
SIMMFIX.

You put it in your auto folder.  It reprograms the MMU, then does a warmstart.

I get 2 bombs on the first boot attempt, but when the machine resets, it does 
just fine.  Any subsequent warmstarts just boot right up.

Be sure to read the instructions....


Hope this helps,
Tony
twmanino@eos.ncsu.edu