4116's and other memory

From: Doug Spence <ds_spenc_at_alcor.concordia.ca>
Date: Sun Apr 4 06:00:49 1999

On Mon, 29 Mar 1999, Richard Erlacher wrote:

> Back in those days, Mostek was the leader in DRAM technology and the 41xx
> number is essentially theirs, though other manufacturers used it as well.
> The National numbers differed from this practice. Their equivalent was
> the MM5290. I'll have to go back and verify all this, but I do believe
> that they can safely be replaced with 4116's or their equivalent.

Yup, this seems correct. I have some MM5290s and MM5298s that have been
used in an Apple clone for a short period and seemed to work fine.

Actually, I was using the Apple to test the RAM. I put the chips where
I'd see the bottom half of their address range on the second high-res
graphics screen. Some of the MM5298s had bad bits (permanently set or
unset) but those parts are -4s so they may be too slow for the Apple
hardware (not sure).

All of the MM5298s I have (not very many) are -4 parts, and all of the
MM5290s I have (even fewer) are -3. So speed might be the only difference
between the part numbers.

-- 
Doug Spence
ds_spenc_at_alcor.concordia.ca
http://alcor.concordia.ca/~ds_spenc/
Received on Sun Apr 04 1999 - 06:00:49 BST

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