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

[Joe Grubbs]

:) Yeah I was just daydreaming... Too bad it's not feasible, it would be a neat thing to pull off



> Date: Wed, 29 Apr 2015 09:54:59 -0400
> From: retrocanada76 at gmail.com
> To: coco at maltedmedia.com
> Subject: Re: [Coco] In Search Of... Someone to port NitrOS-9 to SuperPET
> 
> 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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