Quote Originally Posted by irving2008 View Post
stuff you couldn't begin to make work reliably under Windows.
Tell me about it. My current stepper driver works under DOS so I can get my sticky fingers on the timer interrupt. Fortunately SVGA screen drivers are available or it would have to be VGA. It does everything in straight lines. I call the routine with a new x,y,z then idle away the time painting the screen until it gets there.

The new driver will run under XP. Every command is single byte until tool change when I upload tables. The little computer will buffer up to 32k so I should be able to keep ahead even when XP goes on vacation.