[COFF] 52-pin D-Sub?
Clem Cole
clemc at ccc.com
Sat Feb 29 08:28:14 AEST 2020
On Fri, Feb 28, 2020 at 5:12 PM Dennis Boone <drb at msu.edu> wrote:
> > using the secondary pins as well.
>
> Best I could tell, the major intended purpose of the secondary circuits
> was to implement autodialer, especially when those handshaking signals
> on the primary were down because there was no connection, so you
> couldn't do anything through them yet.
>
The autodialer is a separate spec. It's ECMA RS-4xx something IIRC, I
forget the number and I'm not near my books. That was the DN-11 from DEC
which talked to an AT&T 801 dialer. It used RS-232C electrical signals,
but it's actually different than RS-232C (IIRC, Able called them a
'QuadraCall').
The way auto-dialing is spec'ed, is that a single dialer supports N
modems. The Out-Band dialing stuff was an invention of Hayes who clearly
had not read the AT&T (later ECMA) spec.
>
> Was there anything else in mind during the spec process?
>
RJE stations.
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