On 02/09/2018 01:59 PM, allison via cctalk wrote:
> I use that as an example of compatibility or extensions another more
> familiar is the NEC V20 fits in the 8088 socket but has enhanced
> performance and native 8080 emulation mode.
The V-series may be a good example of why Intel didn't want to publicize
the added 8085 instructions.
Aside from 8080 emulation, the V-series also has some x86 "orphan"
instructions, such as the BCD string instructions that were never
carried over into any other x86 design.
It reminds me a bit of the 386 bit-string instructions that were
publicized early on, but never implemented AFAIK in any 80386.