Hans-Joachim Holtzmann wrote 7 lines
I have a problem to draw graphiks on a HP-Vectra with Intel 815 Board
(PIII 933MHz) with integrated Graphik. I muist work with NT 4.0 SP6a in
a DOS-box
The test of Graphikmode and Graphikdriver results 3 and 18.
gm=18 is correct it is a 16 bit graphik with 1024*758 Points.
gd=3 is wrong because the dokumentation tells me I should get nummbers
>30000.
I think you reversed them and that gd=18 and gm=3. gd = 18 means a 16bit mode. The gm=3 means simply that that this is the third mode that is supported for 16bit color. The return value is only there to be used with setgraphmode() later, it's not intended to be used to get any useful information (for that purpose, you have GetMaxColor, GetMaxX and getMaxY). You should never depend on the values of symbolic constants, since they can change at any time.
If I start Mandel the screen is black and after keypressing the normal
text-screen will be back with the message the program needs 3...seconds
to create the graphic.
This has nothing to do with the above however.
The problem is the same with compilerversion 1.04.
What can I do to fix the problem?
Nothing unfortunately. The video drivers under WindowsNT/2000/XP almost always report that they report all these VESA (SVGA) modes, but when you actually switch to them, they only draw garbage or nothing). These are bugs in the video drivers of your video card (or in WinNT maybe, although I've already once heard of someone who was successful) and we really cannot do anything about it. Sorry.
Jonas
