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  1. 1 point
    You're going to have to create a level shifter board to sit between the two (the FPGA is designed to work with up to 3.3V logic, the 6502 works at 5V). Other than that, you're good. You can use the RAM for anything you can think of, provided that it is fast enough and you have enough free gates on the FPGA for your design. At 10ns it's more than fast enough to feed a 6502, and adding page selection logic plus emulating the old FD controller isn't stretching the Duo's capacity (you could implement the entire Challenger in FPGA logic, including the 6502, and still have free capacity.