Fast Unibus Sync Serial?

Paul Koning paulkoning at
Tue Apr 26 09:57:37 CDT 2016

> On Apr 26, 2016, at 10:26 AM, Mattis Lind <mattislind at> wrote:
> 2016-04-26 3:45 GMT+02:00 Ken Seefried <seefriek at>:
>> Is there an equivalent to the DSV11 for Unibus?  Or other quick Unibus
>> sync serial that my Google-fu isn't good enough to find?  The DMC11
>> looks like it can do 56Kbps over V.35, which is better than the
>> 19.2kbps on the DMF32, but it would be useful to be able to push to
>> 256Kbps (or faster).  I'm particularly interested in doing HDLC.
> DMP11?
> Seems to be able to do 500 kbit/s full duplex and 1 Mbit/s half duplex. It
> consists of two cards M8203 and M8207. I have a few that I cannot find any
> use for...

DMP11 does DDCMP.  If you want HDLC, options are more limited.  The obvious question is "why HDLC?"

HDLC is ok so far as it goes, but DDCMP is superior in every respect.  The only reason to use HDLC is that you need to talk something that can't be made to speak DDCMP.


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