Ok, so still no progress. I have eliminate a lot of possibilities, but the board is still not running.
IC 8 and 9 check out ok.
Ive replaced the PIA at IC18. The outputs of the old one were floating at around 2 volts at the outputs. I have seen this in the past with bad PIAs so I went ahead and installed a socket and replaced it.
Per Clay's guide, I also looked at IC11 and IC12. IC12 was already socketed, and the 7408 checked out good. IC11 is a triple gate, and it appears to be working as I am getting signals at the inputs and pulses at the outputs.
There is a little bit of prior work on this board, but it all looks good at first glance. my next step may be to trace down all the connections for the prior work, and make sure there is not something amiss there.
My chip tester has come in very handy today.