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? Mohamed Aly Systems Analyst Pason Systems Corp. Calgary, Canada