Semi-OT: Interesting or unusual PC Compatibles?
cisin at xenosoft.com
Sat Jun 30 15:30:55 CDT 2007
On Sat, 30 Jun 2007, Chris M wrote:
> Fine, but does a V40 present the same *possible*
> incompatibility issues as an 80186. And for that
> matter but OI NOT THE ORIGINAL QUESTION does a V20/V30
> present any of it's own...
a few, but very few. For example, 8086/8088 has a few bugs. One of those
is that if you have TWO prefixes (segment override , and REP) to a MOVSB,
. . . if there is an interrupt during execution of that instruction, then
the first? prefix is forgotten. NEC failed to provide that bug in the
In addition, there are instructions to invoke the 8080 mode of the
V20/V30. That behaves differently than those instructions on an
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