Looking for early versions of MicroVMS & VWS - test-drb@ccmp.vtda.org

24 Mar 2009

On Wed, Mar 25, 2009 at 12:09 AM, Zane H. Healy <healyzh at aracnet.com> wrote:
...
  At 4:15 PM -0400 3/24/09, Paul Koning wrote:

 RSTS on an 11/73 driving an TU50 would stream quite well (with
 Backup). ?Is a MicroVAX-I slower than that? ?Or does RSTS do streaming
 I/O better than VMS? ?(I suppose that's possible...) ?Interrupt
 latency shouldn't be much of an issue; the thing is that you have to
 queue up multiple buffers. 
 Isn't the PDP-11/73 about twice as fast as a MicroVAX I? ?Remember the
 MicroVAX I is only 0.3 VUPS. 
I never got to play with an 11/73 back in the day (we stopped buying
PDP-11 gear around the days of the F-11 chip), but I would not be
shocked to learn that the J-11 is twice as fast as a MicroVAX-I.  It
really is dog slow.  It's a good thing the MicroVAX-II was much, much
faster or DEC would have been in trouble long before they eventually
got into trouble.

-ethan