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Thread: Choosing a 6502

  1. #11


    We're "lucky" that the NMOS 6502 undocumented/illegal instructions are so consistent for so long. Had MOS not been so cash-strapped, and CSG so Jack Tramiel, I suspect they would have been quashed a la 65c02 much earlier.

  2. #12


    You guys are awesome. Thanks for all the feedback! Doing some rearranging in my mad scientist workspace but will update in the next few days.


  3. #13


    Thanks for the feedback, guys. It was indeed the UB4 ROM. I swapped one in and the drive successfully initializes.

    Now I just gotta diagnose the chattering when it tries to read...


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