RSTS/E question and media. - test-drb@ccmp.vtda.org

31 Dec 2008

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Subject: RE: RSTS/E question and media.
   From: "Paul Koning" <Paul_Koning at Dell.com>
   Date: Wed, 31 Dec 2008 12:38:33 -0500
     To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>

  > ...you'd need a sync DDCMP interface
(for a Q-bus system like that it
  would
  be a DMV11).  More to the point, it looks like
the Micro-PDP11  support
 > appeared in V8.0, and I suspect there may be some other small details
   specific
to the 11/53 that are later still.  
 Right, so I'd need to plumb the 11/53 into say an Alpha via a serial
 connection. Sync... so I'd need to get a PCI sync card too, for the
 latter. 
Or later yet (V10.x?) there's async DDCMP, I'm not sure how clearly
accessible but I'm pretty sure it's in there.

	paul 
DDCMP can run over sync or async lines it was commonly done async for slow
lines and sync for fast lines the division was around 19.2kbaud with the 
sync cards favoring the faster than that rates.  

I used to run DDCMP async at 2400baud though the Mill gandalf switch to a Vax 
host in the the Mill. Worked ok in the days when 2400 was fast and 9600 was 
fastest and expensive.

Allison