I tried this but it didn't help. Now that GRX has failed with a regular serial mouse too on this machine, it seems the problem is related to the graphics adapter not the mouse driver. The machine has a PC-580 Pentium Little Board, that's PC/AT comaptible.

The manual says it has VGA support (with Chips & Technologies 65555 HiQVideoTM Accelerator). I tried modetest, and successfully got 800X600 mode. I do get this mode with my GRX program too, but only when the mouse driver is not loaded.

Mohamed Aly escribió:

I am testing a small DJGPP/GRX program that initializes graphics and draws

a

line. The program works fine, except when I load the Carroll Touch (carrolltouch.com) touch screen drivers ( tapi.exe, ctkern.exe, ctmouse.exe) The touch screen mouse works fine alone too.

But GRX fails in GrSetMode( ) when the driver is loaded, and the computer hangs. The mouse driver uses COM 2 - S/W Int 55h, 56h - H/W Int 7 - I/O address 300.

Does any one know of a conflict or what might be in conflict with the GRX?

I don't know, but it can be that the mouse driver is confussed if you set a video mode other than the standard vga, try to set GRX20DRV with "stdvga" and call GrSetMode with GR_default_graphics.