Hölscher hoelscher-kirchbrak at
Wed Apr 21 11:23:15 CDT 2010

> On 4/20/10 10:47 AM, H?lscher wrote:
>> Has anyone got manuals for the DEC DMP-11 synchronous serial interface?
>> It was a common interface for multipoint DDCMP DECnet connections in the
>> era before Ethernet became well-established.

> On Tue, 20 Apr 2010 12:03:45, Al Kossow wrote:
> The documents for the DMR-11, which uses the same board set, is on bitsavers
> under pdp11/unibus.

> I don't know what the difference is between the DMP and DMR

AA-H803C-TE DECnet-VAX System Manager's Guide says on page 2-45:

"DECnet-VAX supports four DDCMP line devices: 
the DMC-11, the DMR-11, the DMP-11, and the DMF-32 synchronous line.
The DMC-11 and the DMR-11 are point-to-point line devices and are
considered identical. The DMP-11 is either a multipoint control, 
or multipoint tributary line device. 
The DMF-32 synchronous line is a point-to-point or multipoint tributary line device."

The boards are identical at the module number level seemingly, but there are most
probably different subtypes of the M8207 DMx microprocessor and/or M8203 line units

I think the M8207-RA is for the DMR11 and the M8207-YA/YB/YC is for the DMP11.

Anyone to confirm or doubt that?



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