Re: R6502AP

There are two ways, you can either do it like the supercpu and have fast 
ram next to the cpu and add a write fifo to update motherboard ram at 
1mhz. I think this is the best solution.

The alternative is to just have fast ram and have the vic fetch from 
there. The vic accesses don't need to take 1mhz, you can just decode the 
accesses and convert it to 200mhz accesses. I don't think it's practical 
to replace the dram and pla on a c64 motherboard and replace them with 
faster components. You'd likely have to start with a new c64 motherboard 
and just add a vic chip. In my opinion you've moved so far away from it 
being a c64 that you might as well just add the vic to your fpga/asic.

On 05/12/2014 23:10, silverdr@wfmh.org.pl wrote:
> There is no equally fast VIC chip so it would have to be done in some
> intelligent way. I don't know - like using only the available bus time
> to run @200MHz? There was this 2MHz 6502 project for the 64. Maybe
> something similar, only at 200 or whatever the RAM can keep up with.


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