From: rudolph wratten (cowthief_at_worldnet.att.net)
Date: Sun Feb 13 2000 - 11:22:16 EST
Hello.
The facts are now in.
A 701C/CS with 4 meg of native memory can accept 16 megs of SO-DIMM.
8 meg of native memory can accept 32 megs.
With a planer mod, 16 meg on the board, 64 megs will give you 80 megs of
usable memory.
I have another friend who replaced the CPU on the planer board, and while at
it put in 16 megs of memory. This machine shows very good numbers under
test.
After some research, I found IBM internal notes that recommended that the
701 series have 20/24 megs as the upper memory limit. This was because a 4
meg machine will not access the upper memory directly, thus no real boost in
speed. The planer board will not accept greater than 16 megs of memory. This
is because of some address limits of the chipset for the 486 CPU. To replace
the chips requires both ESD and SMD practices be followed,. Sorry for the
long post, most people do not have such old computers.
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