[Coco] [Color Computer] Original Multi-Pak

[jdaggett at gate.net]

Kevin

Only the  Halt and NMI hardware interrupts are brought out to the 
expansion connector. They are paralelled. There may have been a 
mod to bring the NMI and/or HALT into a 4 input or gate and then to 
the expansion portt for the  MPI. To be honest th at should have 
been done in the first place. 

james

On 18 Apr 2005 at 9:43, Kevin Diggs wrote:

Date sent:      	Mon, 18 Apr 2005 09:43:21 -0700
From:           	Kevin Diggs <kevdig at hypersurf.com>
To:             	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
Subject:        	Re: [Coco] [Color Computer] Original Multi-
Pak
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>

> Hi,
> 
> jdaggett at gate.net wrote:
> > Mike 
> > 
> > Yes the PAL chip, 16L4, needs replacing. The COCO 1/2 uses 
> > address $FF9F to write to software control slot selection. On the
> > Coco3 this address is the Horzontal OFfset register in the GIME
> > chip. The software control of the slot selection has been moved to
> > $FF7F on the Coco3.
> > 
> 
>  Wasn't there also some kind of irq routing thing? Or was that
>  optional?
> 
>      kevin
> 
> -- 
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco