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. --Chuck
