spargue wrote: ↑Sat Jul 01, 2023 10:24 pmOh wait I just saw an issue. You need to watch A15 A14 from the slot to see if you are accessing the rom address space. Not (A15 & A14) - > #CEMartin Schmalenbach wrote: ↑Fri Jun 30, 2023 4:34 am Just so I'm clear from having followed this interesting & spirited discussion...
If I WRITE to the banked ROM space for banks above #0-#31 and I have an expansion card with RAM mapped in to the ROM space, the data that is written by the CPU will actually be stored in the RAM, assuming I've wired the RAM up correctly?
The application I'm thinking of here is. simple Expansion card with RAM occupying several ROM banks at #32 and above that will be useful for speedier development of ROM-based code for cartridges etc.
Something like the circuit below/attached
Yes - I see that now - another good catch - thanks!!