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I made my own DOS implementation (Announce)

posted by tom Homepage, Germany (West), 22.03.2024, 14:12
(edited by tom on 23.03.2024, 07:32)

> Is there any good reason for the user program to modify that struct? Why
> would it want to make it "self-referencing"?
Yes, absolutely.
It allows to allocate some memory (and copy resident code to it) which will
remain resident when the program calls exit().
There are other ways to stay TSR; but this has a couple of advantages.

> Those memory control blocks are not even identical between different
> versions of MS-DOS.
if you allow that later versions added a char name[8]; field, they are 100% identical. since 31 41 years. Since MSDOS 2.0. Across all DOS clones.

> If you modify them, unpredictable things will happen.
 Nope. MKEYB demonstrates that it works very predictable.

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