Date: Tue, 30 Aug 2005 23:57:33 -0700 (PDT)
From: Gregg Eshelman <[EMAIL PROTECTED]>
--- Jeff Walther <[EMAIL PROTECTED]> wrote:
Does anyone have a pinout/datasheet for the
IIfx/LWNT 64 pin SIMMs?
I'm thinking about running off a few homebrew
circuit boards, but
haven't been able to turn up the information on the
web.
If you're thinking of SIMM stackers to put 4 72pin
SIMMs
into one IIfx slot, that's been done already.
No, I'm thinking of making actual 64 pin SIMMs.
However, as an aside, I do not see how the above could possibly work.
72 pin SIMMs are 32 bits wide. 64 pin SIMMs are only 8 bits wide.
One might make an adapter, but at best it would convert one 72 pin
SIMM into a 64 pin SIMM with 1/4 the capacity of the 72 pin SIMM.
It works to convert four 30 pin SIMMs (8 bits wide each) into one 72
pin SIMM (32 bits wide total 4 X 8 = 32). It does not work to try
that in the other direction.
I suppose one could build a monstrosity to plug into four 64 pin
sockets simultaneously and route to one 72 pin SIMM, but even that
would have problems because of the ways that the 72 pin SIMMs play
with addressing and the Chip Enable signals.
Plus, I think that by the time you could build such a thing, it'd be
easier to just desolder the chips from the 72 pin SIMM and put them
on four 64 pin SIMM boards. You've got to build boards that plug
into the 64 pin sockets in either case.
Jeff Walther
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