Yesterday’s Nibbler celebration was premature – I discovered that about one in ten-thousand writes to RAM stores the wrong value. Bad RAM, bad! No biscuit for you! Arghh, what a headache. I first discovered the problem while making improvements to…
YES, IT WORKS! The Nibbler homemade CPU is up and running, and it can play “guess the number” like nobody’s business. Awesome! If you haven’t seen my earlier posts, Nibbler is a 4 bit CPU built from standard 7400 series logic…
Nibbler construction is underway! I’m building the CPU on a 5 x 4 inch perfboard, and connecting the components using wire wrap. This particular perfboard is a Twin Industries 8200 Series, which has continuous metal planes on both sides that…
An old project of mine may return from the dead. A few years ago, I started an ambitious project to build a 3D graphics processor using an FPGA. The goal was to create a simple version of the GPU you…
I’ve made a few refinements to the Nibbler design, and now I’m ready to start building the CPU! After looking at what seemed like a million different possible changes and additions, I’ve decided to keep the hardware exactly as…
The 1970s were a great time to be a geeky kid, thanks to the introduction of the first digital electronic toys. With their beeping songs and blinking lights, who could resist them? Recently I decided to take a trip down…
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