I'm trying to work out some differences between various Namcot 163 class chips like the 175 and 340, but because CopyNES uses $4800-4FFF for I/O, I can't access the 163's data I/O register in the same space.
This has been brought up in the past, and supposedly you can re-map the port address to $4000-47FF by writing to $4016 (using bit 1), but that hasn't worked for me. Any ideas? (bunnyboy? kevtris?)
As an alternative, could you achieve this by changing the address in the source and recompiling / rewriting BIOS? Or is there something you'd also have to change in the hardware?
Also does anyone know of any demo code for using Namco exp sound? Something as simple as generating a tone would be sufficient to check whether a cart has the capability or not.
This has been brought up in the past, and supposedly you can re-map the port address to $4000-47FF by writing to $4016 (using bit 1), but that hasn't worked for me. Any ideas? (bunnyboy? kevtris?)
As an alternative, could you achieve this by changing the address in the source and recompiling / rewriting BIOS? Or is there something you'd also have to change in the hardware?
Also does anyone know of any demo code for using Namco exp sound? Something as simple as generating a tone would be sufficient to check whether a cart has the capability or not.