It lives! Imlac PDS-1, serial #2 is running again.

From: Tom Uban <uban_at_ubanproductions.com>
Date: Wed Sep 4 18:24:01 2002

>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
Received on Wed Sep 04 2002 - 18:24:01 BST