3 Jul
2002
3 Jul
'02
9:43 p.m.
Ethan Dicks wrote:
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"Jerome H. Fine" <jhfinepw4z(a)compsys.to> wrote:
I'd be happy to help. It's a two-layer
board, so it's not _too_
hard to pull the old chips. The jumpers can be just a pair of
wires (0 ohm resistors are nice - single black band, but not
critical).
Sockets are a good idea, and there's clearance for them - I checked.
For mine, I was going to drop in a bunch of 41256s I pulled from some
MS820 boards about 10 years ago (we needed some BIICs and they were $350
new from DEC, or $50 when attached to a used 2MB memory card ;-). I
have a chip tester and have verified that I've only ever lost one DRAM
that I've desoldered that had its leads intact (and only a few by losing
a lead). Those daughter cards can be upgraded from 128K to
512K by replacing the
4164 DRAMs with 41256s and adding W1 and W2.
I can't remember how much memory
is in each system. But if the
chips are 4164, I do have some 41256 chips I can swap. I might
need some help with W1 and W2.