M865/M8650 (was Re: PDP8/A memory problems, what to do?) - test-drb@ccmp.vtda.org

27 Dec 2001

On Dec 27,  8:22, Ethan Dicks wrote:
...
  --- Pete Turnbull &lt;pete(a)dunnington.u-net.com&gt;
wrote: 
...
   How different
is an M865?  Is it only current-loop? 
 It is different.  There is no 40-pin BERG connector - it has a set of
 split lugs line a W-076 card and a 18" cable with a standard Mate-n-Lok
 connector as seen on KSR-33s and VT220s, etc.  I do not recall if I have
 any docs on it, but except for the 20mA/EIA differences, I think it's
 substantially similar, logically, to the M8650.  It's a console port,
 only, permanently set to 03/04.  I forget if the M8650 is modifyable or
 not. 
The M8650 is, the jumpers on the split lugs near the 'A' fingers set the
address.

Sounds like you might want something like a DLV11-KA -- that's a 20mA to
EIA converter in a little black box about 4" x 2" x 1/2".  Actually, that
would be overkill; it has a 110 baud generator, reader-run control, and
other options.  It's meant to add 20mA capability to EIA-only devices like
a DLV11-J but it can be used for any RS232-20mA conversion.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York