[COFF] 52-pin D-Sub?

[Clem Cole]

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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