[Coco] Re: [Color Computer] CoCo 2 and a PC VGA

[Gene Heskett]

On Friday 10 September 2004 12:05, steve_churchman wrote:
>Hi Everyone,
>
>Is it possible to modify a CoCo 2 to work to a PC monitor, and has
>anyone done this?
>
>Regards Steve
>
No, the coco monitors horizontal scan rate is essentially the same as 
your tv, at 15,750 lines/per second.  The pc's 'vga' range doubles 
that to about 31khz/sec.  The horizontal output transformer and 
deflection yoke both lose 95% of their efficiency when you double the 
scan rate.  Thats if the circuitry in a coco monitor could actually 
sync to the higher frequency, which it cannot.  The picture tube 
itself could be used I suppose, but you would have to figure out a 
way to wrap it up in all the electronics of a regular pc monitor.  It 
would make a low quality picture even then though it did work, its 
just not sharp enough for that.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
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Yahoo.com attorneys please note, additions to this message
by Gene Heskett are:
Copyright 2004 by Maurice Eugene Heskett, all rights reserved.


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