--- "Jerome H. Fine" <jhfinepw4z_at_compsys.to> wrote:
> You may remember seeing the PRO350 systems in the stack in front.
Among other things... I think I recall it.
> > 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.
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).
-ethan
__________________________________________________
Do You Yahoo!?
Sign up for SBC Yahoo! Dial - First Month Free
http://sbc.yahoo.com
Received on Tue Jul 02 2002 - 14:42:47 BST