Stuff I grabbed... (Update)

[Tony Duell]

> To get it short: I went, and finally got two HP PSI -> X.21 cables, 5 m
> each. Issue solved. Now to learn something about X.21, and/or communications
> standards in general... Any good sources Google won't turn up likely?

I know nothing about it,and the offiical atandard is likely to be 
expensive :-(

Somewhere I have something called a TAXER, which appears to be a bit 
error rate tester for an X21 link. It's a rather nice portable instrument 
with a 64180 processor in the middle of it (got it at a radio rally for 
not very much...) I also have some kind of comms bridge. It's got a 68K 
processor IIRC, a floppy drive on the front, and X21, X25 (at RS232 
levels) and Ethernet connectors on the back. They're on separate plug-in 
boards that connect to the main logic board, there's a 48 pin socket on 
the mainboard associated with each comms card that holds a 8390 ethernet 
chip for the ethernet interface and a specially-pinned-out (I suspect) 
COM5025 (?) serial chip for the other 2 interfaces.

You've just reminded me to dig this stuff out and have a play...

-tony