Apparently a lot of folks, even those actively hacking on S-100 stuff, don't know about the System Zero! I've had a number of folks say as much. It's definitely a real product, I had a purchase lined up for one a few years ago, but the seller stopped responding to emails (I suspect someone else came in and bought everything). That seller had worked on integrating Cromemco hardware for industrial control usage, and had used a bunch of the System Zero boxes in his time for the purpose. The SCC with 3K Control BASIC plus whatever additional memory or I/O made for a compact little control box with industrial strength design, apparently. Thanks, Jonathan