15 Nov
2003
15 Nov
'03
7:31 a.m.
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(a)xenosoft.com