3 ms·

Yep. The 65C02 has a SYNC output that goes high to indicate an instruction is being fetched on the current cycle. Since there is no cache, it's pretty simple

Yep. The 65C02 has a SYNC output that goes high to indicate an instruction is being fetched on the current cycle. Since there is no cache, it's pretty simple to use this to determine the PC.

ddingus 3y ago
Thought so. From there, it is a bit of logic to map the chip selects to make the writes and reads come and go from the intended resources.
forinti 3y ago
That's it then. I was missing the sync pin. Thank you.