On Sat, 15 Nov 2003, ben franchuk wrote:
> But the REP prefix has a bug, on the early machines if
> I remember reading right, is you can't have interupts
> enabled. OH wait, you only could run DOS and you did not
> need NO STINKING INTERUPTS!, and serial lines ran faster than
> 300 baud!
NO
You could have interrupts enabled. But you could not have TWO prefixes
(REP AND a segment override (to not use the DS/ES defaults))
with interrupts enabled; on return from the interrupt, one of the
prefixes would be lost.
Wasn't presence/absence of that bug one of the tests for presence of the
NEC V30 v intel 8086?
--
Grumpy Ol' Fred cisin_at_xenosoft.com
Received on Sat Nov 15 2003 - 15:31:00 GMT