4 Sep
2002
4 Sep
'02
11:24 a.m.
Incidentally, does anyone have/know where to get 74Hxxx
TTL? I'm working
on a machine that's stuffed with it, and a fair number of chips have
failed. 74LSxxx works in most places, but there are some chips (74H52,
74H54 And-Or-Invert gates, 74H108 JK flip-flops, etc) that don't seem to
have equivalents in other families. If one of those has failed (or fails
in the future) I am going to have problems...
A few months back (or was it a year now), I was trying to stock up on
74Hxxx TTL
so that I would have some to repair my old PDP-11s when/if those parts
died. They
are very hard to locate these days. After much web surfing, I located a
place which
used to sell them, but was switching business over to a more lucrative
solar products.
They still had a large inventory of the parts, but couldn't be bothered to
sell me some
(or all) of the 74Hxxx parts that they had on hand. I imagine that they put
them into
a dumpster -- what a shame!
--tom
-tony