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000077_owner-lightwave-l _Fri Jun 17 14:14:45 1994.msg
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Date: Fri, 17 Jun 94 16:05:40 EDT
From: capitol!staubly@uunet.uu.net (Vicky Staubly)
Message-Id: <9406172005.AA06145@ capitol.com>
To: lightwave-l@netcom.com
Subject: Gigamem and MMUs
Sender: owner-lightwave-l@netcom.com
Precedence: list
Reply-To: lightwave-l@netcom.com
Kim,
There are a couple of ways to find out whether your Amiga has
the MMU which is required for virtual memory systems like Gigamem.
In your tools directory, there may (depending on the version AmigaDos
you have) be a program called ShowConfig. If you don't see "68030 MMU"
in the display window, then you don't have an MMU. I think the program
"CPU" which comes with some versions of AmigaDos, also displays this
info.
The other way is to actually look at your accelerator board.
Find the CPU chip (about 1" by 1" square). It will either say "M68030"
(in which case you _do_ have an MMU), or "M68EC030" (in which case,
you _don't_ have an MMU). Also, one thing I like to check in accelerator
boards is the actual CPU rated speed (the max speed at which the CPU
is guaranteed to run). After the part that says "030" will be some more
letters and numbers (e.g. "RC50" or "FN25"). The numbers are the "rated
speed" in MHz. Sometimes, manufacturers will put, say, a 25MHz rated CPU
in a 28MHz board. This will _usually_ be alright, but sometimes a little
extra cooling might be needed. If you notice occasional lockups when
the computer is idle, that may be a cause. Also, if you have a floating
point processor (68881 or 68882), you can do the same speed suffix check
with it.
Anyway, I hope this helps.
Vicky Staubly
software engineer, CapDisc
staubly@capitol.com