24 Feb
2009
24 Feb
'09
3:29 a.m.
On 23 Feb 2009 at 18:36, Allison wrote:
That it had bugs, can't argue that. They could
have just as easily given
it the base uCOM78 instruction set instead. But how many V20s were bought
to run 8080 rather than as a faster varient of the 8088?
To be certain, almost all of the publications that I saw touting the
V-series chip emphasized the performace aspect. Few even mentioned
the 8080 emulation mode. I was surprised to see emulation extend to
the V40 and V50 uPs.
And almost none mentioned that the V20 implemented many of the 80186
and some of the 80286 instructions.
I've heard reports where the V20 doesn't work as a drop-in
replacement for an 8080. Must be just enough timing difference that
one works and the other doesn't.
Cheers,
Chuck