On 23/07/2018 21:34, Mia Magnusson wrote: >> If you add an ultimax mode then you still have to mirror ram at the >> start of memory, but you have to solve the problem of interleaving >> the 1mhz vic reads into the 20mhz cpu reads. > The speed of the VIC-II reads won't be a problem, it's just a matter of > inserting one wait state for the 65816 You'll be doing bidirectional memory accesses across a bus where both sides run off different clocks. I'm not saying it can't be done, but you have to do it & there will be headaches >> You still need to support all the supercpu mirroring schemes as well, >> or you won't be able to get the correct timing for demo effects. > Will 6510 based demos work at all on a 65816? I'd assume that they use > some well known illegal op codes? You misunderstood, I am talking about 65816 demo effects. I don't know how many 6510 demos use illegal opcodes, but none of my old demos used them though.Received on 2018-07-24 00:00:46
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