[Info-vax] What are the earliest DEC operating systems you worked with ?

[Simon Clubley]

On 2021-03-09, Paul Hardy <p.g.hardy at btinternet.com> wrote:
> Simon Clubley <clubley at remove_me.eisner.decus.org-Earth.UFP> wrote:
>> I _had_ managed to purge working with TKB from my memory. :-)
>
> Aargh. You just brought back horrible memories of a wasted week trying to
> debug a crash on PDP-11 in an application that had a complex TKB overlay
> tree. Eventually traced to cross-calling between branches - worked fine for
> the called routine, but when it tried to return to the caller, it had been
> trampled on by loading the called routine over the top. You must only call
> down to branches, not across.
>
> It was a real relief to move to VAX and lay the application flat!
>

Sorry. :-)

TKB overlays were a solution to the limited memory sizes of those days,
but I am _really_ glad we don't have to do anything like that any more. :-)

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
Walking destinations on a map are further away than they appear.