saj@chinet.UUCP (Stephen Jacobs) (06/26/88)
A while ago I asked what would happen if I set the interrupt level of an ST high enough to disable the vertical blank interrupt. The responses were not unanymous, but I got the idea that there should be about a 5% speed increase, against the possibility of crashing GEM. I just tried it in a computation-intensive GEM application. The good news is no crash. The bad news is only maybe a 1% speed-up. By the way: I tested that the vbl interrupt was really disabled by flipping the switch that controls whether my Thomson Ultrascan monitor is claiming to be color or mono: monitor change is detected in the vbl routine.