8 Jul
2003
8 Jul
'03
1:19 a.m.
Ethan Dicks wrote:
--- Robert Krten <root(a)parse.com> wrote:
7474's Dead d flops? whats the story on that?
Jim
For those of you who missed the announcement in
alt.sys.pdp8,
I've now almost completed the M220 version B schematic. It's
available at:
http://www.parse.com/~pdp8/pdp8i/m220b.html
Cool! Thanks! I have a few M220 cards that will eventually benefit
from your efforts (I borrowed them from a parts machine to keep the
main machines running).
The trials and tribulations of the PDP-8/I
restoration can be
found at:
http://www.parse.com/~pdp8/pdp8i/restore.html
Plenty-o-dead 7474's in that one :-)
That's been my experience, too. I have replaced as many as 8 7474s
at a go to get an -8/L back on its feet. I don't recall replacing
any other chip, as a matter of fact.
-ethan