The biggest hurdle is an electron microscope for examining the features of his transistors. A good friend found a broken one and with $1000, a fair amount of know how and a lot of time they were able to repair it to working condition. As for the photolithography device? The light from a conference room projector is beamed through a microscope to trigger the light sensitive coating on his wafers Zeloof’s chip was his second. He made the first, much smaller one as a high school senior in 2018; he started making individual transistors a year before that. His chips...