What is he planning to level shift? There if your any of your parts are 3.3v the resistor method won't work with the data buses when you go to write, and you're assuming the NES will accept 3.3v inputs (probably will though). There isn't really much point to 3.3v for a cart like this. I would stick to 5v parts unless you're looking for trouble...TmEE wrote: For interfacing 3.3V stuff to 5V you would want 100....470ohm resistors, for pullup/pulldown 1K...10K. I generally use 220ohm and 1K or 4.7K resistors.
Basic Cart Circuit Design
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