Diff between 11/20 and 11/45?
Steven M. Schultz
sms at moe.2bsd.com
Wed Sep 8 15:40:58 AEST 1999
Howdy -
> From: Carl Lowenstein <cdl at mpl.ucsd.edu>
> Abbreviated due to fading memory over the years, but refreshed by some
> of the current discussion. The patch was zero-length but involved more
It has been a long long ('quad'? ;)) time since I first encountered
the problem.
> than the one instruction. Something similar to:
>
> MOV SP, -(SP) MOV SP, R0
> MOV (SP), R0 MOV R0, -(SP)
Ah, thank you for bringing that memory back to the front of the brain!
If R0 is available for that then yes indeed that'll do the trick very
nicely.
> on the stack. Without doing both a SRC and DST operation on SP in the
> same instruction, which is the thing that is incompatible across different
> processor hardware.
The 11/45 (and 70) behave as "expected" as do the KDJ-11 systems
(11/73, etc) so unless a person had an 11/40 (or a /20) around it
would be fairly easy to get bit by the "feature".
When it comes time for MMU "features" I know of one difference between
the KDJ-11 and the other members that had an MMU (11/44, /70, etc). Was
fun tracking it down but not something I'd want to do again ;)
Steven
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