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A comment on How the 8086 processor's microcode engine works. Parent comment

Re:How the 8086 processor's microcode engine works by kens on Sunday December 04, 2022 @12:54PM (#33855906)
I took a look at the V30 manual and it doesn't have an undefined instruction trap. It's an interesting chip, a superset of the 8086 as well as 8080 emulation. It includes bit manipulation instructions kind of like the Z80, along with multidigit BCD arithmetic.

https://www.ceibo.com/eng/datasheets/NEC-V20-V30-Users-Manua...

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Re:How the 8086 processor's microcode engine works by rasz on Sunday December 04, 2022 @04:31PM (#33858122)
V33/V53 and V33A/V53A do have them, with non A variants as non standard exception 122 http://elm-chan.org/docs/dev/v53_e.html mentions it. They build a cute board around it in 1998 http://elm-chan.org/works/cpu_v53/report.html

according to MAME V40 has it as standard exception 6? https://github.com/lesbird/MAME4apple-037b5/blob/master/MAME... Then again https://forum.vcfed.org/index.php?threads/nec-v20-and-cp-m.7... says no.

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