TU58 's is ready to test. I tried it in a spare serial port on a VS 3100.
Result nothing. I suspect the port is 423 and the tu58 232.
Actually the TU58 serial port has the differential driver and receivers used
on the later serial ports. It should talk to DECs version of RS423 with no
problems at all.
What sofrware are you using to drive it?
-tony