I'd like to take a whack at recreating some of these "clip-on" variable speed overclocking devices. They seem like a very good candidate for 3D printing a very, very simple circuit design. I used to have one from "XLR8" in a 6100/60 about 25 years ago that clocked the machine to 80+ MHz.
I just have no sample to work from anymore, unfortunately.
I just have no sample to work from anymore, unfortunately.