[Info-vax] OT: obscure PDP11 OSes (even more dinosaury)

[Bill Gunshannon]

In article <mlouja$7aj$2 at dont-email.me>,
	Simon Clubley <clubley at remove_me.eisner.decus.org-Earth.UFP> writes:
> On 2015-06-15, Dirk Munk <munk at home.nl> wrote:
>>
>> The PDP-11 was a 16 bit architecture. Writing larger programs on a 
>> PDP-11 always involved using overlay. I've spend many hours trying to 
>> construct my Cobol programs in such a way that I could use memory 
>> resident overlay. Otherwise it would become disk-resident overlay, and 
>> that involved lots of extra disk IO as the name suggests. That would 
>> make an application a lot slower. Using RMS in supervisor mode also was 
>> a must to keep a somewhat fast application.
>>
> 
> The TKB overlay functionality (and it's associated documentation) is
> something I have _very_ gladly left in the past and have almost
> successfully purged from my memory. :-)
> 

Having spent the least of my PDP-11 time on RSX I can't say how hard
it was to use TKB but I do overlays on Ultrix-11 and have never found
it particularly difficult.

bill

-- 
Bill Gunshannon          |  de-moc-ra-cy (di mok' ra see) n.  Three wolves
billg999 at cs.scranton.edu |  and a sheep voting on what's for dinner.
University of Scranton   |
Scranton, Pennsylvania   |         #include <std.disclaimer.h>