Bruce Toback writes:

> Wirt Atmar writes:
>
>  >you could actually hook up an old
>  >KSR 33 or 35 teletype to a DTC if it still supported 110 baud. Otherwise,
>  >nothing's changed about basic terminal serial connections in 40 years.
>
>  Not quite: I'm not sure when EIA RS-232 was promulgated, but I'm pretty
>  sure it was around 1960.

Bruce is right. I've told myself a million times: "Self, never exaggerate,"
but I still don't listen. It has only been 38 years, not 40, as I stated.



>  Prior to RS-232 -- and for quite some time
>  afterward -- most terminal serial connections used a 20ma or 60ma current
>  loop.

John Korb wrote privately and pointed out the same thing. He also pointed out
that current loop to voltage converters were available during the conversion
period to RS-232.

Wirt Atmar