DOS ain't dead

OS/2 extender (Developers)

posted by Ringding, 11.09.2025, 20:41

> I was considering disabling interrupts, entering 64-bit mode, doing all my
> work above 4 GiB, and then when I need any service, switching back to
> 32-bit mode and reenabling interrupts.
>
> Presumably exactly the same as DOS extenders did, especially DOS extenders
> written prior to DPMI existing (I think that's a thing).
>
> You think the above scheme won't work?

No. That's the protection in "protected mode" at work.

It works in DOS, as there is no protected mode operating system running that prevents programs from switching processor modes like crazy.

Complete thread:

• OS/2 extender - kerravon, 10.09.2025, 21:05 (Developers)
  • OS/2 extender - Rugxulo, 10.09.2025, 21:30
  • OS/2 extender - Ringding, 11.09.2025, 17:44
    • OS/2 extender - kerravon, 11.09.2025, 17:57
      • OS/2 extender - Ringding, 11.09.2025, 20:41
        • OS/2 extender - kerravon, 12.09.2025, 00:08
          • OS/2 extender - Rugxulo, 12.09.2025, 04:07
            • OS/2 extender - kerravon, 12.09.2025, 16:55
          • OS/2 extender - Ringding, 12.09.2025, 17:20
            • OS/2 extender - kerravon, 12.09.2025, 18:03