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

Mark Marlette mark at cloud9tech.com
Tue Apr 5 19:05:41 EDT 2005


Thanks but sales are up again this year again. Company keeps on a
growing. Don't let my standard VGA connector setup hold back yor
design. Think big! :) I hate making them anyway!


Quoting RJRTTY at aol.com:

> In a message dated 4/5/05 1:31:27 PM Eastern Daylight Time,
> Torsten at Dittel.info writes:
> << > And I love the idea of using the extra pin on the CoCo CM-8
> port.
>  I guess a pin which is planned to be a "just input" to the PIA and
> which
>  detects the presence of a device by its electrical ground uses a
> pull up
>  resistor to create a "high" level while no device is attached. Would
>  this prevent the pin in any way from being used as an output?
> Hardware
>  people?
>  Torsten >>
>         The coco3 has a 4.7k pullup resistor on that line........and
> the I2C specification for the BIDIRECTIONAL data line for these chips
> calls
> for a 4.7k pullup resistor .      I smell the sweet odor of
> success which could turn into the foul odor of defeat and
> humiliation so dont hold me to it but I have worked out the
> details mentally while I was having my car serviced in preparation
> for
> the trip to chicago and I think it will work.    Now I need to
> experiment to test some assumtions I have made about how
> the hardware behaves.   After that I will make the attempt to
> impliment it and report my results here.
>        The only down side to this is the need to redsign the cable.
> We will have to use an alternate plug and socket combination.
> Sorry Mark,   I was hoping to create some business for you by using
> the same cable you sell.  Oh well.
> Roy
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