DOS ain't dead

What does DOS undocumented function 55h? (Developers)

posted by RayeR , CZ, 02.02.2026, 22:47

This guy tries to run Win 3.x native under Linux environment (not wine/qemu/etc...). He has some partial success:
https://www.youtube.com/watch?v=xT-ZvToZDLw
He'd like to know what DOS func. 55h/int 21h do, he just made some bypass, is it documented somewhere?

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DOS gives me freedom to unlimited HW access.

Complete thread:

• What does DOS undocumented function 55h? - RayeR, 02.02.2026, 22:47 (Developers)
  • What does DOS undocumented function 55h? - ecm, 02.02.2026, 23:01
    • What does DOS undocumented function 55h? - RayeR, 02.02.2026, 23:25