DOS ain't dead - How to detect the text mode?

How to detect the text mode? (Developers)

posted by rr , Berlin, Germany, 01.02.2021, 17:56

> > Do you know any (EGA ir later) video adapter that
> > does not support this function [int 0x10,
> > ah = 0x1b]? I am interested
> > because I have used few adapters and all did work,
> > but design of a fallback would depend on how often
> > one shall find an incompatible video BIOS.
>
> I am not very sure about that myself. But RBIL lists the function as "PS,
> VGA/MCGA", so my guess is that not all EGA cards actually support it.

I had a quick look to my physical copies of the books "VGA-Kompendium" (German) und "Programmer's Guide to the EGA, VGA, and Super VGA Cards". Both say nothing about function 1Bh on the EGA card. So expect, that RBIL is right with saying "PS,VGA/MCGA".

If one of the late EGA cards supports this call: fine.

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Complete thread:

How to detect the text mode? - Laaca, 14.11.2020, 11:00 (Developers)
- How to detect the text mode? - Japheth, 14.11.2020, 16:01
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