DOS ain't dead

Question about some x86 opcodes (Developers)

posted by Rugxulo , Usono, 06.11.2008, 21:06

> NEC V20 chips (V25 is a microcontroller version of it) were often used in
> "Turbo-XT" machines as a faster replacement of Intel 8088. Did anyone ever
> complained about DOS not running correctly on those? I doubt. Also much of
> other software would experience problems there. So I think that
> NOSIGNEXTEND is not necessary on PCs, unless some emulators or debuggers
> are considered.

I would doubt it's an issue too, but I'd have to ask Jim Leonard (8088-obsessed dude). Anyways, most popular assemblers I tried seemed to use the short form, which means that they would all be buggy if it was an issue, so I highly doubt they weren't tested "back in the day". Anyways, these days NEC chips are very very very rare, as even a 286 outruns it. The only "bug" commonly known for them is that "aam 16" etc. (i.e. with any operand other than default 10, since it was undocumented by Intel) don't work.

Complete thread:

• Question about some x86 opcodes - mht, 02.11.2008, 14:02 (Developers)
  • Question about some x86 opcodes - Japheth, 02.11.2008, 17:51
  • Question about some x86 opcodes - DOS386, 03.11.2008, 10:04
    • Question about some x86 opcodes - mht, 05.11.2008, 19:54
      • Question about some x86 opcodes - Rugxulo, 06.11.2008, 21:06
        • Question about some x86 opcodes - mht, 08.11.2008, 08:46
          • Question about some x86 opcodes - Rugxulo, 12.11.2008, 00:43
            • Question about some x86 opcodes - mht, 12.11.2008, 16:54
              • Question about some x86 opcodes - mht, 22.11.2008, 13:59