19 Jun
2007
19 Jun
'07
3:10 p.m.
Ethan Dicks wrote:
I only bring up the M220 at this level because I have
a few dead M220s
and will need to resort to component level repair or board-level
replacement to keep my -8/i and -8/Ls running. From my existing
experience, though, I'd start by ensuring my 7474s and 7440s are
working as expected - I've replaced several in other boards over the
years. They seem to be the two most common ICs to fail in my PDP-8/L.
Unicorn Electronics has most of the TTL but alas
* Discontinued by manufacturer - stock conditions may vary * is flagged
for a lot of the chips. Now might be time to order spares.
http://www.unicornelectronics.com/prod.htm
-ethan
.