4 Dec
2004
4 Dec
'04
7:13 a.m.
>>>> "Bj??rn" == Bj??rn
<bv(a)norbionics.com> 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.
paul