11 Feb
2006
11 Feb
'06
3:46 p.m.
In article <m1F844e-000IyFC at p850ug1>,
ard at p850ug1.demon.co.uk (Tony Duell) writes:
Speaking of current loop interfaces, just exactly how is data
transmitted? Is it a current pulse train?
--
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Under
"puzzles for the ages", one might also wonder what the IBM was
thinking when they added the 20ma current loop circuitry to the board. Did
they really think that folks were going to use them to drive an ASR 33? Or
that RS232-to-current loop adapters were hard to obtain?
A few random guesses [...]