[Coco] [color computer] Just imagining...

[Paul T. Barton]

I'm not sure either, but may have them if
they're still in my basement/garage room (same room).
Which one?

--- jdaggett at gate.net wrote:


> Paul

> 

> I seemed to remember of that but not sure that I

> have it anymore. I wished like heck that I got

> more of the app notes for the 6800 and 6809

> processors in the 80's.

> 

> james

> 

> On 31 Jan 2006 at 11:12, Paul T. Barton wrote:

> 

> > Actually E-high is CPU and E-low is Video.

> > You got it right about the IDMA, and it

> > can work with a 6800/74ls783/mc6847 also,

> > with some glue logic. Motorola did an

> > app notes sheet about dual CPU's, interleaved

> > them.

> > 

> > Paul - idezilla

> > 

> > --- jdaggett at gate.net wrote:

> > 

> > > David

> > > 

> > > IDMA, Interleaved DMA. This is already being done on

> > > the Coco. The Video accesses ram when the E Clock is

> > > high and the CPU when the E clock is low. Tack on

> > > another CPU and you have contention with ram. 

> > > 

> > > james



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