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

[jdaggett at gate.net]

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

On 31 Jan 2006 at 10:49, David L. Foreman wrote:

From:           	"David L. Foreman" <davelf11 at cox.net>
To:             	"CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Subject:        	Re: [Coco] [color computer] Just imagining...
Date sent:      	Tue, 31 Jan 2006 10:49:26 -0700
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> One of the 650(x) companies had a development system with two processors.
> One  processor was clocked 180 degrees out from the other one and could 
> access memory and I/O while the other was
> on the internal half cycle. This was used in program development and you 
> could see what was changing in memory etc. while the
> first processor was running the program being tested.
> Two 6809s should be able to be set up that way.
> Dave Foreman