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I made my own DOS implementation (Announce)

posted by ecm Homepage E-mail, Düsseldorf, Germany, 22.03.2024, 07:31

> > Actually they are identical among compatible DOS systems. The system
> call
> > services with ax = 5800h to 5803h on int 21h are not "internal" to DOS.
> No, they are not identical.
>
> In that Github page (which does not even work on Seamonkey, the page is
> just missing elements and the console contains no errors) the error is on
> line 92. It seems to be a different version of the program, but it also
> modifies the internal memory allocation structure of DOS.
Okay well whatever revision of the file you have, in the repo that's https://github.com/davidebreso/mkeyb/blob/518d24d578dcb094b7f74800cd982bb4e4b7178b/mkeyb.c#L92

And yes, this does modify a DOS internal structure - it assumes the MCB format and how to make an MCB self-owned. This is not the same for all DOS systems but MS-DOS compatibles like (E)DR-DOS and FreeDOS do often use the same structures. My TSRs also assume that the MCB structure is compatible.

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l

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