IBM 3270 interfacing?

[Paul Koning]

>>>>> "Bjørn" == Bjørn  <bv at norbionics.com> writes:

 Bjørn> IBM 3270 used the EBCDIC control codes for their documented
 Bjørn> purpose. HP 2645 terminals had an option to run multidropped
 Bjørn> using an almost identical protocol. This protocol is half
 Bjørn> duplex.

That brings back some nightmares... the ugliest protocol by far I ever
worked on was the one used by Harris 2200 newspaper display editing
terminals.  Bisync, half duplex, multidrop, using a PDP-11 DL11-E
async line at the host end.  Bletch.  Naturally, the driver would mess
up only during the midnight to 6 am shift... and I got to debug it
while the composing room foreman was waiting for things to be put back
into working order.

     paul