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From: neil@cs.hw.ac.uk (Neil Forsyth)
Newsgroups: comp.sys.atari.st
Subject: Re: More than 4 Meg ??
Message-ID: <3153@odin.cs.hw.ac.uk>
Date: 5 Jun 91 08:33:28 GMT
References: <91154.141443SYSPMZT@GECRDVM1.BITNET> <1991Jun4.112631.10649@cs.nott.ac.uk>
Sender: news@cs.hw.ac.uk
Reply-To: neil@cs.hw.ac.uk (Neil Forsyth)
Organization: Computer Science, Heriot-Watt U., Scotland
Lines: 28

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)
	4Mb	= 4 x 1Mb SIMMs

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! Neil Forsyth                      JANET:  neil@uk.ac.hw.cs                 !
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