Re: Theorizing: what can be done with DOT clock signal present on C64 expansion port?

From: David Wood <jbevren_at_gmail.com>
Date: Thu, 4 Nov 2021 09:54:55 -0400
Message-ID: <CAAuJwir38GDzVa2z4d9mztxtAx3sWtc6F-wz02czZ-FMdfLFDw_at_mail.gmail.com>
On Thu, Nov 4, 2021 at 5:27 AM smf <smf_at_null.net> wrote:
>
> You could make that argument about all of the suggestions.
>
> 1. Adding an extra vic 2 would be a nightmare. The cpu's clock comes is generated by vic2 from the dot clock and now you have two vic2's. They don't have a reset input, so the clocks will be all out of phase.

The best solution for adding a second VICII would be to use a
dual-port ram.  The 8mhz clock wouild still be handy but it wouldn't
be necessary to worry about timing between the two ViCII's.
Having attempted to synchronize two VICII's in the past I learned they
don't reset their rasters at all on powerup, starting at a random
point on screen. :)

> 2. Digital sound doesn't need a clock as high as the dot clock, the ø 0 clock would be good enough and you would need to synchronise to that anyway.
>
> 3. The math coprocessor one is a bit vague, you could hang a raspberry pi zero off the back of a c64 but I'm not sure why you'd use the dot clock.

Perhaps this would be similar to the 68881 add-on for the apple2
series, which did actually accelerate math functions that called thes
SANE toolkit in GS/OS.

> On 03/11/2021 23:09, gsteemso wrote:
>
> As much as I like that idea, I'm not sure how it would take advantage of a pixel-rate clock signal.
>
> On Nov 3, 2021, at 11:59 AM, Justin <shadow_at_darksideresearch.com> wrote:
>
> TCP offload.
Received on 2021-11-04 16:00:02

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