On 11/18/2021 6:34 AM, Michał Pleban wrote: > smf wrote: > >> Be careful how you design it, the 6509 based cbm2 pretty much did what >> you're suggesting and programming them was terrible. > The 6509 had an additional functionality: the memory bank for LDA (xx),Y > and STA (xx), Y instrutions was selected separately. Not sure OP's intent, but they could use this project (which Michal knows about, just putting here for the OP): https://github.com/go4retro/Nu6509 To maybe implement some help for the banking that's not so restrictive. I can say that, issues with banking aside, I'd recommend adding an IO port to a 6502, like so: https://github.com/go4retro/Nu6510 To avoid using the expensive 6510 directly. Here's a version for the +4: https://github.com/go4retro/Nu7501 Like the gitlab project mentioned earlier.Received on 2021-11-18 19:00:02
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