Well of course it was a bargain, it was a "piston" engine! By the way, who "piston" it? Was it Clippy? I bet it was!
Andy, that was pretty cool to watch! I took out the delay, and noticed something interesting about _KEYDOWN. The display speeds up more with a key held down! I switched to INKEY$ and did not have that problem. Also, the program is speed restricted at a certain point. That can be mostly eliminated by getting rid of the _DISPLAY command, but the graphics are compromised (flicker). Hey maybe just add a top RPM limit? Anyway, very cool effect, and now just maybe your son will switch to coding??? It pays more, and it's less greasy... Well, unless you're a Cheetos freak like me, of course. :D
Pete