Digital PDP11/10 PDP 11/20 Price List Dec 15, 1969 - test-drb@ccmp.vtda.org

26 Jan 2015

...
  From: B Degnan 
...
  there was a "rev 1" PDP11/10 that was used
as a process control system.
 You could buy the 11/20 version that had the front panel. Otherwise
 they were very similar/same systems. 
According to my 1971 11/20-15-R20 handbook, the 11/15 (the 'rev 1' 11/10,
KC11 processor) did have one significant difference from the 11/20, which is
that it only supported one interrupt level, instead of four (see table pg.
2). I seem to recall reading that in other places, too.

Of course, according to that table, the 11/05 (KD11-B) also only supported 
one interrupt level, so maybe that table is confused.

	Noel