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I want to design an expansion card, but I haven't found any schematics or other info I would need for the interface.

I understand that this may not be stable right now, but I would at least like an idea of what it might eventually look like. I see four slots on the prototype motherboard. There must be a pinout somewhere.

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Can you release the pinout for the expansion cards, or at least a high-level description of what you expect expansion cards to look like? Is it just a direct access to the 40 6502 pins or something else?

 

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There are no firm pinouts for the expansion bus yet, for obvious reasons.

If you really want to design an expansion card, I'd suggest starting by getting one of the WDC developer boards, such as the W65C02SXB. That has a full expansion bus, and you can breadboard and prototype an expansion card using that for your prototype. Once the CX16 is actually available, it should be a simple matter to move your prototype over to the Commander proto board and test it on the real machine. 

 

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