[Info-vax] Whither VMS?

[Rob Brown]

On Mon, 5 Oct 2009 at 12:06 -0000, Robin Fairbairns wrote:

> remember, the later pdp 11 models had i-space and d-space, but i 
> never encountered anyone using them.  this was, of course, because 
> the pdp-ll architecture made it really rather difficult:

RSX-11M-Plus made it easy to use separate I/D space.  It was just a 
switch on your compile command line and a switch in the task builder. 
(If you were programming in Macro-11, you used separate I- and D-space 
PSECTs instead of a switch on the MAC command line.)

Now if you were programming without the benefit of an operating 
system, you would find that using separate I/D spaces was no more 
difficult than using the rest of the memory management hardware.


-- 

Rob Brown                        b r o w n a t g m c l d o t c o m
G. Michaels Consulting Ltd.      (780)438-9343 (voice)
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