Thanks NomakeWan. I am inclined to agree. It may have been its time. Although, as I understand it, if there is no communication to the computer the only way to bring it back to life is by pulling the T side chip and bench flash it with the programmer.

After checking and possibly reseating the PLCC32, I'll try to socket the E side and clean flash it, even though I am pretty certain it has nothing to do with the communication link.
Hopefully I can make this one come back to life.