bpa wrote: > They were modified telex system which were circuit switched devices - so > when ,message were sent there was a "copper loop" between device,IIRC > signalling was done via current not volts and so guaranteed messages. > The company I worked, one of their products was a compatible terminal- > final testing at airline meant checking failure tolerance - throw as > much volts and current until the device literally was burnt out.
We might have to start an off-topic reminisces thread ... We also built some kit to do UK telex (I remember a Dowty SCVF modem being on one board and our stuff on an adjacent one) ... around 6 lines per 3U high rack mounted box). BABT brought 2 huge cases of kit to our office to do the "type approval" testing. Took 2 attempts to pass because we were a few milliseconds out in one of the actions. I wrote thousands of lines of code for those systems - in Coral-66 and Macro-11. I wrote my last code for that system in 1992 although I had finished serious development work around 1988 I think. Telex and leased lines were dying out but we saw the future and built store-and-forward fax ... and we (but not me) built (on VAX in C/C++) an X.400 system ... a technology that ended up being comprehensively defeated by SMTP (but that is another story). So back to OP ... old timers who wrote code in ancient languages will probably find it easy enough to use one of the modern scripting languages even if many of the features are not fully understood. Finding small bits of sample code or something that does much of what you want makes it much easier. "Ego-less programming" as one of my old lecturers used to call it. Paul Webster http://dabdig.blogspot.com author of \"now playing\" plugins covering radio france (fip etc), kcrw, supla finland, abc australia, cbc/radio-canada and rte ireland ------------------------------------------------------------------------ Paul Webster's Profile: http://forums.slimdevices.com/member.php?userid=105 View this thread: http://forums.slimdevices.com/showthread.php?t=113437 _______________________________________________ unix mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/unix
