9 Feb
2018
9 Feb
'18
2:41 p.m.
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