[Coco] ...speaking of emulation on the CoCo

[jdaggett at gate.net]

Bob

Pin #39 (TSC) would have to be untied from ground if a second 
processor was to share the buss. Another method would be to used 
dual port ram to pass datat between the two processors. The 
BS,BA,LIC,BUSY, and AVMA lines are not connceted on the COCO 
3. A second precessor would need to access the TSC line to tristate 
the main 6809 busses while the second processor reads/writes to 
ram. 

Getting around that one could use dual port ram and pass an IRQ 
through the CART IRQ signal. 

It is not difficult but  wou ld require a bit of h ardware  hacking.

james


On 30 Dec 2004 at 10:13, Robert Emery wrote:

Date sent:      	Thu, 30 Dec 2004 10:13:08 -0800 (PST)
From:           	Robert Emery <theother_bob at yahoo.com>
To:             	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
Subject:        	[Coco] ...speaking of emulation on the CoCo
Send reply to:  	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
	<mailto:coco-
request at maltedmedia.com?subject=unsubscribe>
	<mailto:coco-
request at maltedmedia.com?subject=subscribe>

> Just throwing this out there for conversational purposes. A while back
> we were discussing the possibility of emulating the Vectrex on a CoCo,
> and ISTR it was mentioned that the Vectrex has two processors... one
> for the main program and one to calculate vectors (in the background?)
> It was not totally ruled out that the CoCo3 could do it, but seemed
> doubtful.
> 
> It got me to wondering if it would be possible to connect two CoCo's
> together via the cartridge port to form a sort of dual-processor CoCo,
> with one of them becoming a "slave" to the other's instructions.
> 
> Any thoughts? What else could we do with such a setup?
> 
> Bob
> 
> 
> 
> __________________________________ 
> Do you Yahoo!? 
> Yahoo! Mail - Helps protect you from nasty viruses. 
> http://promotions.yahoo.com/new_mail
> 
> -- 
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco