Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!elroy.jpl.nasa.gov!jato!vsnyder
From: vsnyder@jato.jpl.nasa.gov (Van Snyder)
Newsgroups: comp.sys.atari.st
Subject: Re: More than 4 Meg ??
Message-ID: <1991Jun5.222630.24777@jato.jpl.nasa.gov>
Date: 5 Jun 91 22:26:30 GMT
References: <91154.141443SYSPMZT@GECRDVM1.BITNET> <1991Jun4.112631.10649@cs.nott.ac.uk> <3153@odin.cs.hw.ac.uk>
Reply-To: vsnyder@jato.Jpl.Nasa.Gov (Van Snyder)
Organization: Jet Propulsion Laboratory, Pasadena, CA
Lines: 28

In article <3153@odin.cs.hw.ac.uk> neil@cs.hw.ac.uk (Neil Forsyth) writes:
>In article <1991Jun4.112631.10649@cs.nott.ac.uk> dpg@cs.nott.ac.uk
>(Dave Gymer) writes:
>> ... I believe, that the MMU in the STe can
>>only handle .25 and 1 meg SIPPS/SIMMS, and these are arranged in two banks,
>>which must contain the same amount (hence, memory configurations can only
>>be .5 meg, 1 meg, 2 meg, 2.5 meg, and 4 meg). I too have a four meg STe.
>                          ^^^^^^^
>
>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
-- 
vsnyder@jato.Jpl.Nasa.Gov
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