3 Apr
1999
3 Apr
'99
10 p.m.
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(a)alcor.concordia.ca
http://alcor.concordia.ca/~ds_spenc/