Re: Independent CPU/VIC-II setup

From: smf <smf_at_null.net>
Date: Tue, 1 Jun 2021 23:44:43 +0100
Message-ID: <8c39a0e2-1def-042f-66f2-d4986193e53c_at_null.net>
On 01/06/2021 18:46, Jim Brain wrote:
> Your comments are not in line with the original request for information.

Slowing the cpu down to 1mhz when reading or writing to vic2's ram is
going to be worse than a supercpu connected to a c64. My understanding
of the results he wanted to achieve, it wouldn't slow the cpu down that
much.

The p500 doesn't do anything like that anyway, the cpu runs at 1mhz and
cycles get stolen no matter what the cpu and vic2 bank is. Extra
complexity would be wasted as the cpu and vic2 are normally in bank 15
anyway, color ram is always in bank 15 even when vic2 is fetching from
one of the dram banks & there is no built in mechanism to switch the cpu
into dram banks and back again to call the kernal.
Received on 2021-06-02 01:00:03

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