DEC RSX-11D and its COBOL compiler?

[Paul Koning]

> On May 29, 2018, at 9:38 AM, Guy N. via cctalk <cctalk at classiccmp.org> wrote:
> 
> On Tue, 2018-05-29 at 17:30 +1000, Nigel Williams via cctalk 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/
> 
> As I recall, IAS ("Interactive Applications System") was a timesharing
> environment layered on top of RSX-11D.
> 
> When I was working with RSX-11D many years ago, I heard the opinion
> expressed (maybe by DEC field service?) that RSX-11D was a pig, and IAS
> was an elephant on a pig's back.

Sounds right to me.  RSX-11/D could fit in 124 kwords, but not all that 
comfortably.  IAS required 22 bit addressing.  RSX-11/M was apparently 
created in response to that piggishness.

I once saw an RSX-15 kernel listing, which had a lot of very familiar
looking data structures -- it implied that RSX-11/D had its origins,
at least as far as overall design is concerned, in RSX-15.  

	paul