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

[Simon Clubley]

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. :-)

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
Microsoft: Bringing you 1980s technology to a 21st century world