On May 29, 2018, at 1:04 PM, Paul Koning
<paulkoning at comcast.net> wrote:
  On May 29, 2018, at 10:30 AM, John Forecast via
cctalk <cctalk at classiccmp.org> wrote:
  On May 29, 2018, at 3:30 AM, Nigel Williams via
cctalk <cctalk at classiccmp.org> wrote:
 On Tue, May 29, 2018 at 1:27 AM, Al Kossow via cctalk
 <cctalk at classiccmp.org> wrote:
  I have 11D on bitsavers. 
 this is actually RSX-11D? 
http://bitsavers.org/bits/DEC/pdp11/magtapes/ias/ 
        Yes. The two V3.4A tapes will allow you to build either RSX-11D or IAS.  
 Wow, I did not know that.  It certainly confirms that IAS is just a slightly hacked
RSX-11/D...
        paul
  
        Probably more that just ?slightly? hacked but certainly not a completely
new design. The scheduler was completely reworked
        along with the swapping mechanisms. When I first saw it, there were 2 user
interfaces; SCI> the System Control Interface for
        management operations and PDS> Program Development System for normal users.
Before release, both were collapsed
        into the, now familiar, DCL> interface. Just remapping DCL commands onto the
standard utilities was a major part of the work.
          John.