does anyone knows how to capture and handle INT $10 ?

I need to make a procedure using getintvec and setintvec to capture INT $10
(Video Interrupt), but after running, the screen goes crazy. How can I do
that ?

If you thought about it for a moment you'd realize that if you
intercept services to a device and ignore all its services, then the
device would appear dead.  Likewise, if you hook a device and ignore
half its services, then the device would appear to be a half-wit!