DOS ain't dead

DOS specifications ("standards") (Developers)

posted by awik, 19.11.2020, 15:11

> Hello Albert,
>
> > 5. Memory mapped file API for INT21.
>
> Not sure how useful this would be in the context of MS-DOS in general.
> Things like memory-mapped file I/O and demand loading are very much tied to
> virtual memory paging mechanisms, and MS-DOS is meant to support systems
> which do not even have any notion of virtual memory.
>
> An API for memory-mapped files might kind of make sense in the context of
> 32-bit DPMI, though.

The latter is what I had in mind. As we all know, there is a shortage of address space in real/V86 mode, and even in 16-bit protected mode, there is a 64KB segment size barrier, which would serve to make memory mapped files even more cumbersome to use than regular file I/O.

> Thank you!

Not sure what you're thanking me for, but you're welcome :)

-Albert.

Complete thread:

• DOS specifications ("standards") - awik, 18.11.2020, 16:57 (Developers)
  • DOS specifications ("standards") - awik, 18.11.2020, 18:48
  • DOS specifications ("standards") - RayeR, 18.11.2020, 20:07
    • DOS specifications ("standards") - awik, 19.11.2020, 13:32
  • DOS specifications ("standards") - glennmcc, 18.11.2020, 20:22
    • DOS specifications ("standards") - awik, 19.11.2020, 13:44
  • DOS specifications ("standards") - Zyzzle, 19.11.2020, 02:23
    • DOS specifications ("standards") - awik, 19.11.2020, 14:02
      • DOS specifications ("standards") - RayeR, 19.11.2020, 19:11
  • DOS specifications ("standards") - Laaca, 19.11.2020, 11:27
    • DOS specifications ("standards") - awik, 19.11.2020, 15:03
    • DOS specifications ("standards") - RayeR, 20.11.2020, 02:04
  • DOS specifications ("standards") - tkchia, 19.11.2020, 14:12
    • DOS specifications ("standards") - awik, 19.11.2020, 15:11
    • DOS specifications ("standards") - RayeR, 19.11.2020, 19:06
  • DOS specifications ("standards") - ecm, 20.11.2020, 16:08
    • DOS specifications ("standards") - awik, 21.11.2020, 16:43
      • DOS specifications ("standards") - tkchia, 21.11.2020, 17:37
        • DOS specifications ("standards") - awik, 21.11.2020, 18:58
          • DOS specifications ("standards") - tom, 22.11.2020, 14:58
      • DOS specifications ("standards") - marcov, 22.11.2020, 22:35
        • DOS specifications ("standards") - RayeR, 23.11.2020, 05:49
      • DOS specifications ("standards") - 33-bit LBA support - ecm, 23.11.2020, 10:01
    • DOS specifications ("standards") - ecm, 25.12.2020, 21:27
  • Hosting/Sharing - rr, 23.11.2020, 21:19
  • DOS specifications ("standards") - Ro2003, 13.01.2024, 09:06
    • DOS specifications ("standards") - awik, 16.01.2024, 11:28
      • DOS specifications ("standards") - jadoxa, 17.01.2024, 02:15
        • DOS specifications ("standards") - Rugxulo, 17.01.2024, 03:40