Re: C64 MMU POC

On 7/10/19 6:01 PM, Francesco Messineo wrote:
>>
>> Interesting...  So, you'd read several bytes whose value you actually
>> don't care about...  but the decoder hardware would recognize *which*
>> bytes you'd read; and, from that, infer what MMU operation you wanted?
> 
> exactly. That's how the bank switching for RAM/ROM banks work on the
> 16K language card of the Apple II for example.

That's also how the RAM/ROM switching works in TED from the 264 series. 
You write to address $FF3E to enable ROM and to $FF3F to enable RAM. 
It's only the write cycle to these addresses that matters, not what you 
write.

  Gerrit