>I have four 16C74's that have been programmed MANY times.  I have not used
>them for a while, but just recently thought I'd give them a try.  I loaded
>them with some code and they seem to work..... well sort of.

Maybe they are making bad contact with the socket you're plugging them into,
or maybe the socket is damaged? Did you solder the socket, or any of its
pins, while you had a chip plugged into it? That can screw up certain
sockets, especially "single wipe" sockets.

Cheers, Bob