DOS ain't dead

How to keep resident only a part of the program (Developers)

posted by tom , Germany (West), 14.08.2021, 11:40

> But I know that many assembler programs CAN do it. They use the INT
> 21h/AH=31h call and determine which portion of code to thow away and which
> to keep? Or they use some other mechanism?

usually, you arrange your code layout 'manually' like


resident_code
resident_stuff
transient_code
more_stuff


and make sure that resident_stuff never calls anything in more_stuff after going resident. in ASM this easy, in C at least doable.

for a PASCAL example, you might look at the sources of FreeDOS KEYB.EXE hich I think is written in (some strange sort of) Pascal.

Complete thread:

• How to keep resident only a part of the program - Laaca, 14.08.2021, 07:31 (Developers)
  • How to keep resident only a part of the program - tkchia, 14.08.2021, 08:49
    • How to keep resident only a part of the program - Laaca, 14.08.2021, 10:32
      • How to keep resident only a part of the program - tom, 14.08.2021, 11:40
        • How to keep resident only a part of the program - RayeR, 14.08.2021, 15:49
          • How to keep resident only a part of the program - Laaca, 14.08.2021, 20:18
            • How to keep resident only a part of the program - RayeR, 16.08.2021, 03:22
    • How to keep resident only a part of the program - tom, 14.08.2021, 11:28
    • How to keep resident only a part of the program - ecm, 15.08.2021, 13:47
      • How to keep resident only a part of the program - bretjohn, 27.08.2021, 21:22
  • How to keep resident only a part of the program - marcov, 14.08.2021, 13:18
  • How to keep resident only a part of the program - CandyMan, 27.08.2021, 17:46
  • How to keep resident only a part of the program - bretjohn, 27.08.2021, 21:47
  • How to keep resident only a part of the program - Laaca, 08.03.2022, 12:24
    • How to keep resident only a part of the program - tom, 08.03.2022, 12:51
      • How to keep resident only a part of the program - tkchia, 08.03.2022, 14:20
        • How to keep resident only a part of the program - bretjohn, 08.03.2022, 19:19
    • How to keep resident only a part of the program - rr, 08.03.2022, 17:32