low_budget Posted September 25, 2012 Share Posted September 25, 2012 I decided a couple months ago to design a new Nintendo NES circuit board. I was annoyed how Nintendo couldn't seem to make a perfect NES console. The front loader is big and has the stupid lockout chip and ZIF connector. The top loader is rare, has no reset button, and crappy RF video. Mods exist to fix some of these issues, but I kinda think of them as a band aid fix. I've been getting better at my PCB designs, and wanted more of a challenge than the Atari s-video kits I've been building. Here's the features I want to include in my board design: Original CPU and PPU chips at the same clock frequency. Composite or RGB PPU chips can be used (has amplifiers on board for both.) Better sound pre-amplifier with separated audio channels (can be mixed if desired.) Top Loader! Smaller, board measures 6-1/2" x 4-1/4" without need for RF box. Modern switching 5v regulator. I found a NES schematic, but it has several errors. So, I've been checking the connections on a NES pcb that I removed most of the components from. Progress so far: Modern replacements found for memory and other components. Cart slot, memory, CPU and PPU connections complete. Controller input connections done. CPU/PPU clock circuit done. Video and sound amplifier circuits done and laid out. Need to do: Find replacements for diode arrays DA 1,2,3,4 Re-check connections multiple times to avoid mistakes General board layout cleanup Add ground plane to PCB My plan is to make 3 prototype boards to make sure everything works. I'll keep this page updated. I have a lot of time and money invested, I really hope it works! I hope to have the prototype boards ready in a month or so. 5 Quote Link to comment Share on other sites More sharing options...
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