4 May
2001
4 May
'01
2:01 a.m.
--- Russ Blakeman <rhblake(a)bigfoot.com> wrote:
I thought they might be the same as the old 4256 (and
possibly the 41256)
dram that we used to use in them.
414256, yes. 41256, no. One is a 1Mb chip, arranged as 4 x 256K, the other
is a 256K chip, arranged as 256K x 1. Different number of pins. You will
be able to spot the difference.
I used to scavenge ATs for them to fill Amiga boards like the A590 and A2091.
The other place I needed them was for the VAXBI COMBOARD - 2Mb of 256x4
because we recycled our old 256x1 DRAM design from the COMBOARD-II and still
had several centuries-worth of 74S409 DRAM controllers lying around (still
have many, many pounds of them on the shelf). Besides using old stock, the
other advantage was that only one of our software products needed more than
32Kb of RAM on the serial card, so we could populate one bank (512Kb) and
still run all the software that was ever ported to it.
-ethan
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