72XX, 73XX, and 74XX logic boards

[Tim Shoppa]

Tom Uban wrote:
> I have a friend who is cleaning out his basement and has
> some boards which have a number of 72XX, 73XX, and 74XX
> parts on them. I'm not familiar with the 72 and 73, but
> I'm guessing they are unobtainium at this point.

Most likely they are date codes, especially if "XX" is never greater
than 52 :-).

There are some signetics and TI and NatSemi line driver/receiver parts
with 72xx and 73xx part numbers, though.

Tim.