27 Jun
2004
27 Jun
'04
8:48 a.m.
[4070 serial card]
I have this card. It is a while ago since I last
looked at it, but iirc
it didn't look too complex. If anyone wants to reconstruct this card,
It's not that complex. There's the normal 40 pin UART and some TTL for
things like baud rate generation, interfacing to the 4070, etc. One
feature is a pair of '157 muxes which let you substitute a fixed cheacter
if you get a parity error or similar. I've never actually used that though.
Half the PCB is covered with the jumper instructions etched into the
copper. Very useful!
-tony