> 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 Why didn't you added lines 6 and 7? It wouldn't had hurt... > 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 21:00:02
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