30 Jun
2007
30 Jun
'07
1:30 p.m.
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
V20/V30.
In addition, there are instructions to invoke the 8080 mode of the
V20/V30. That behaves differently than those instructions on an
8088/8086.