separating rare ICs from boards/ was Re: Need Docs for XT RAM Board...
hilpert at cs.ubc.ca
Fri Nov 17 13:16:51 CST 2006
Ethan Dicks wrote:
> Or have a use for the chip, but value the board as well (especially in
> the case of being able to restore it to full functionality later).
> but I wanted to retain two working parts, not just one. For those keeping
... had a similar situation with two pieces of equipment based on the 4004
processor, both of which I wanted to keep functional. Both use 4201's (clock
generator specifically for 4004/4040 systems, a rather obscure little IC) but
one of the 4201's had failed. Fortunately the remaining good one was already
socketed so there was no problem moving it over after replacing the bad one
with a socket. I've since been able to replicate the functionality of the 4201
with 3 SSI CMOS ICs so I don't have to keep swapping the good 4201 back and forth.
(...cracked the bad 4201 open and actually managed to find the fault under a
microscope - a blown trace in a metalization layer ... not that I can do
anything about it.)
More information about the cctech