[Coco] In Search Of... Someone to port NitrOS-9 to SuperPET

[CoCo Demus]

The dram is accessed in multiple clock cycles, row strobe, column, etc. I
don't see how sharing the clock edges would help here.

Also, even making each of them in a edge of the clock if they share the
same bus you will end up with bus contention.






On Wed, Apr 29, 2015 at 9:47 AM, Joe Grubbs <jsgrubbs at hotmail.com> wrote:

> This is pure pie-in-the-sky-thinking, but does anyone know if either the
> 6502 or 6809 used in the SuperPET rely on an external clock? If they do, it
> might be possible to make it a dual-processor machine. I've read that they
> share the same addresses, so you'd have to split their work up on clock
> high or low, or something thereabouts, giving them bus control one at a
> time or perhaps selectively on-demand. Would be neat to have the I/O
> handled by the 6502 and leave the 6809 to do the heavy lifting. But if they
> aren't externally clocked and there's no PLL circuitry to keep them sync'd,
> then it's not really feasible.
>
>
>
> > From: coco at toughmac.com
> > Date: Tue, 28 Apr 2015 20:15:00 -0500
> > To: coco at maltedmedia.com
> > Subject: Re: [Coco] In Search Of... Someone to port NitrOS-9 to SuperPET
> >
> > I think it’s either/or.
> > —
>
>
>
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