IBM 3270 interfacing?

From: Paul Koning <>
Date: Sat Dec 4 15:13:41 2004

>>>>> "Bj??rn" == Bj??rn <> writes:

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

Received on Sat Dec 04 2004 - 15:13:41 GMT

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