Here are two resident programs that allow forcibly set VGA adapters to 30-line mode when trying to install via BIOS 2nd or 3rd video mode.
VGA3x - checks the video mode setting, and if the 2nd or 3rd one is set, then independently sets the 30(34) line mode using VGA ports.
When writing this program, the source code of the program was used VGA480 by Dmitry Gurtyak.
Ways of changing the source texts to change the inline modes are indicated in the comments.
Published in Softpanorama 1993, Vol 4(38). SP54A
Public domain
I am not author, just translate to english and Nasm. :)
Original author:
Vadim V.Belman,
Dniepropetrovsk,
Work phone : (0562)448-158
Network 2:464/20.4@fidonet