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

[Johnny Billquist]

On 2015-06-16 13:35, Bill Gunshannon wrote:
> 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.

Overlaying capabilities and features in Ultrix can't honestly be 
compared with the capabilities in TKB. For good or bad...

	Johnny