PDP11/15 - test-drb@ccmp.vtda.org

22 Aug 1997

Since no-one seems to have answered this, I shall put my bit in.  I am no 
PDP expert, though.

...
  After all the discussion here recently about
collecting PDP11's I have 
 located one which I intend negotiating for. I haven't actually seen it yet.

 It is a PDP11/15, a model number that I haven't seem mentioned. Is there a 
 listing somewhere on the web that describes the various models as there is 
 for PDP8's ? 
The 11/15 and 11/20 were two variants of the original PDP11 CPU, which 
came out in 1970 (I think).  The processor itself may have been called 
the KA11, but I am not sure of this.  The difference between them was 
system configuration, AFAIK.

...
  This one apparently dates from about 1970, and is
probably incomplete. 
 There was talk of a rack, the PDP11/15 itself, some RKO5 disk drives and 
 some boxes labelled PDP11/10 which may be other computers. There is no 
 other IO device other than front panel switches.  
PDP 11/10 is usually an 11/05 variant (again the difference is 
configuration of the system), dating from c. 1974  (and full of TTL - 
74XX device codes and 74XX date codes can be very confusing).  But I 
have heard rumours of an 11/15 variant of that name.  No doubt Allison, 
Tim or Tony will tell you all about this.  One day I shall get my 11/10 
working...

...
  Could this equipment be used with a more recent
terminal? I have no chance 
 of finding a card reader or teletype but have access to several VT220's. 
AFAIK it will require a current loop interface.  Some quite late 
terminals had this feature - I use something called a Westward Graphics 
Terminal.

Philip.