Re: Building my monster C64 accelerator

From: MagerValp (
Date: 2003-08-18 16:05:09

>>>>> "OA" == Oliver Achten <> writes:

OA> My new project i´m going to realize is building my own 65sc816
OA> based accelerator modification for my C64.

Sounds like a fun project! 

OA> Now i wonder if my plan to clock it at 8.86Mhz will actually work,
OA> because of the speed of the PLA. Yes, i´m going to integrate a
OA> slow-down circuit for all slow devices in the C64 (VIC, CIA
OA> etc..), but i wonder if the PLA will be fast enough to generate
OA> the chip-selects for the system when the clock goes at 8.86Mhz.

No, you will have to do system writes at 1 MHz. Even if the chip
selects were generated fast enough, the chips themselves need a longer
write cycle. You can find all the chip timings in the PRG and on

    ___          .     .  .         .       . +  .         .      o   
  _|___|_   +   .  +     .     +         .  Per Olofsson, arkadspelare
    o-o    .      .     .   o         +
     -       +            +    .

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