On Wed, Oct 25, 2023 at 5:58 AM Walter Oesch via Freedos-devel
<freedos-devel@lists.sourceforge.net> wrote:
>
> From Code:
>
> if(_setvideomode(_SRES16COLOR) == 0) /* Switch to 800*600 mode with 16
> colors */
> {
> printf("\n\nVideo mode not supported!!!\n");
> printf("Maybe the VESA driver has not been loaded!\n");
>
>
> There must be used VESA driver.
>
If it helps to have a quick test program to try on your board, you can
find GRAFTEST.EXE here:
https://personal.freedos.org/temp/GRAFTEST.EXE
This just puts the display into graphics mode then draws a square,
circle, and diagonal line. The EXE is compiled with OpenWatcom C using
the defaults (using "WCL -q GRAFTEST.C") so it's without optimization
- it's just a demo program. Source code is in GRAFTEST.C (at same
location, also copied below)
#include <stdio.h>
#include <conio.h> /* getch */
#include <graph.h> /* graphics mode */
int main()
{
if (_setvideomode(_VRES16COLOR) == 0) {
puts("cannot set video mode");
return 1;
}
/* draw shapes */
_setcolor(1); /* blue */
_rectangle(_GFILLINTERIOR, 50,75, 350,375); /* from 50,75 to 350,375 */
_setcolor(2); /* green */
_ellipse(_GFILLINTERIOR, 300,200, 500,400); /* from 300,200 to 500,400 */
_setcolor(15); /* br white */
_moveto(10,10);
_lineto(600,400); /* line from 1,1 to 600,400 */
if (getch() == 0) {
/* if getch is zero, then extended key. call getch again to clear
it and get a new extended code */
getch(); /* but we don't really need it anyway :-) */
}
/* done */
_setvideomode(_DEFAULTMODE);
return 0;
}
(my code formatting may be messed up when copied/pasted into an email)
I'll delete the https://personal.freedos.org/temp/ URL around November 1.
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