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testing speed of DOS assemblers under djl's 8086 DOS emulator (Emulation)

posted by Khusraw E-mail, Bucharest, Romania, 12.05.2026, 12:29
(edited by Khusraw on 12.05.2026, 13:00)

> Okay, I did grab AP.EXE 24.02 the other day and finally tested it
> more yesterday.
Thank you very much!

> It does work on native DOS, but ... djl's NTVDM doesn't handle it. He
> admits he has some gaps in emulation and only tested common instructions
> emitted by compilers. So under the emulator I can't even get a help screen.
> (Anything out of the ordinary could be suspect, and writing in pure
> assembly definitely brings out atypical uses.)
I found some spare time to build David Lee's NTVDM and run the test myself. The problem you noted doesn't lie with the emulator (which, BTW, seems to be a really good piece of software), but with the assembler (which, besides using a PUSH immediate right at the beginning, also uses NEAR conditional jumps, a 386+ instruction, as you know). Anyway, what I was actually interested in was finding a CC0 or equivalent and simple 8086 DOS emulator, and so far, I'm satisfied with what I've seen from this NTVDM.

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