[Coco] overdrive ...

[jdaggett at gate.net]

Kevin

Exchanging data between the data bus sof the 6809 and the 68000 
will need other than just syncing clocks. You would need some 
bridge circuit that would allow the two data busses to be isolated yet 
allow either to send data across. This is essentially what the PC 
clones do in the north bridge and sout bridge chip sets. Logic that 
allows data to flow from one data buss to another data buss. 

A simple bridge would be a dual port ram. This will allow either CPU 
to pass data between the two data busses. There also needs to be a 
protocol for exchange of data. 

james

On 25 Apr 2005 at 10:50, Kevin Diggs wrote:

Date sent:      	Mon, 25 Apr 2005 10:50:23 -0700
From:           	Kevin Diggs <kevdig at hypersurf.com>
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Subject:        	Re: [Coco] overdrive ...
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>  Won't data transfer between the two be easier if the clocks are
>  synced? 
> I am thinking about a 68k cpu pak.