Thanks to the people who have responded. There is no suffix to the board
number. M8189, that's it. I've looked really closely at the soldering of the
UART socket. It has the same flow as the rest of the components, so I still
think it was manufactured this way. I powered it up tonight and determined
that the daughter card is the console port. I connected a terminal and it
works as you would expect. The firmware seems to be standard 11/23+ 1.0
firmware. I think I'll just by a 6402 UART and replace the daughter card.
Thanks again,
Bill