Synchronous serial Re: E-Mail Formats RE: Future of cctalk/cctech

Ethan Dicks ethan.dicks at
Thu Jun 18 14:26:16 CDT 2020

On Thu, Jun 18, 2020 at 3:08 PM Chuck Guzis via cctalk
<cctalk at> wrote:
> On 6/18/20 11:55 AM, Ethan Dicks via cctalk wrote:
> > We used to run our sync serial stuff between 9600 and 56kbps, both our
> > own Bisync products, and DDCMP over interfaces like the one that's
> > part of the DMF32...
> My recollection of the Bell 209 is that it supported a low-speed reverse
> channel in addition to the FDX primary.

I had to look that up.  Yes.  I see that in the spec, at *5*bps.

> Did any DEC equipment ever take advantage of that?

I've never encountered it before, so I cannot confirm.


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