Hello,

I am trying to execute a old program. It works under MS-DOS 4.01, but the problem is related with VGA emulation. Apparently, the program was designed only to run under 2 specific VGA cards, a Oak Technology (OTI) model and a ET4000. The ET4000 model is emulated under Dosbox 0.74, so i modified the dosbox-0.74.conf specifying the machine=svga_et4000 parameter. However, it doesnt work and i get the following error message:

https://ibb.co/eWb46F

It seems that, even if the same graphic card is emulated, the program is looking for an specific graphic BIOS signature in order to work. Without that, the video driver is not loaded and the program always launch an error message saying that "Graphic driver is not installed. Error initializing VGA!".

This is the (very simple) autoexec.bat file from that program:

1cls
2echo off
3keyb gr,,c:\keyboard.sys
4@C:\ML\KONF\getcard
5@if errorlevel 30 goto OTI
6@if errorlevel 20 goto ET4000
7@echo Keine gltige Grafikarte gefunden 
8@goto weiter
9:OTI
10C:\ML\KONF\otivga
11@goto weiter
12:ET4000
13C:\ML\KONF\et4005
14:WEITER
15prompt $p$g
16c:
17cd\ml
18ml4600

The problem is perfectly reproducible. I have uploaded the 3 relevant files here:

https://www.sendspace.com/file/igdu8h

getcard.exe seems to be a detection tool for correct display driver to be installed. The other two files (otivga.exe and et4005.exe) are the specific drivers to be loaded (if specific bios signature is found).

Any idea how i could successfully ejecute that program?.

Thanks,