Re: about accelerator chips/cards

[MagerValp <MagerValp@cling.gu.se>]

>>>>> "dx" == damage x <damage_x@hotmail.com> writes:

dx> The 65816 upgrades for the C=64 simply run at 1MHz in the old 64K
dx> address space and run at 20MHz when working above 64K.

No, they don't. The SuperCPU runs at full speed from local SRAM with
mirrored writes through a 1-byte fifo to the internal C64 RAM and I/O.
RAM reads are always at full speed, mirrored RAM writes are stalled if
you write more than one byte per 1 MHz cycle, and I/O is always synced
to the internal bus, and even slowed down for some peripherals (e.g.
6526 CIAs don't like more than one access per every 4 cycles).

-- 
    ___          .     .  .         .       . +  .         .      o   
  _|___|_   +   .  +     .     +         .  Per Olofsson, arkadspelare
    o-o    .      .     .   o         +          MagerValp@cling.gu.se
     -       +            +    .     http://www.cling.gu.se/~cl3polof/