[Coco] Re: [Color Computer] Re: Adapter from Coo3 to SVGA

[jdaggett at gate.net]

Torsten

Yes pin#10 from  the monitor connector goes to PB3 of IC4 
(68B21). PB4 to PB7 of that chip is also not used!!!

These four pins can be used for a SPI, I2C, PWM, or general 
purpose I/O. These were the mode control pins that were used on 
the Coco1 and Coco2. Only the Coco3 can use these pins for other 
purposes. 

PB3 to PB7 is not mirrored inside the GIME. 

james


On 4 Apr 2005 at 15:03, Torsten Dittel wrote:

To:             	coco at maltedmedia.com
From:           	Torsten Dittel <Torsten at Dittel.info>
Date sent:      	Mon, 04 Apr 2005 15:03:06 +0200
Subject:        	[Coco] Re: [Color Computer] Re: Adapter 
from Coo3 to SVGA
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> Isn't there a normally unused (input) pin at the CoCo's RGB connector,
> which was planned to be used for RGB monitor detection? AFAIR (don't
> have the Service Manual here) it is connected to a PIA and might be
> programmed as an output to replace the cassette cable solution...
> 
> By the way, is there a picture visible without running any software
> before? I guess the software is just to modify e.g. the gamma
> curves...
> 
> Torsten
> 
> 
> 
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