[Coco] TRS-80 Tandy Color Computer CoCo 3 RGB Video Cable

[Gene Heskett]

On Sunday 22 July 2007, Derek wrote:
>The VGA option would be great but I was under the impression it could not be
> done for various reasons. I have a similar switch that allows me to use my
> Atari 8 bit machine with my vga monitor & kvm switch.
>
> Can you give me the link to the VGA to CoCo Vendor please?
>
>Thank you
>
>Gene Heskett <gene.heskett at verizon.net> wrote: On Sunday 22 July 2007, Derek 
wrote:
>>There was recently an e-bay auction (which I lost btw..grrr) for a cable
>> that went from a Coco III  to a 9 pin RGB monitor. I was wondering if
>> there are any schematic or instructions on how to build one of these
>> around that someone would be willing to share? I see the old 9 PIN color
>> monitors all the time at local thrift stores for around $5 so this would
>> be an affordable way to upgrade to a nice video display. Also I ould think
>> there would only be certain monitors that this cable would work with. What
>> specifications would one need to look for on the monitor end?
>>
>>The auction which has ended is here :
>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=009&sspagename=STRK%3AMED
>>W %3AIT&viewitem=&item=190132725303&rd=1&rd=1
>
>Derek, those monitors usable with the coco's nearly ntsc video output are
> few and far between today as the few NEC 3fg's & multisync's, in addition
> to the magnavox 8cm515 and 1cm135's, and of course the shacks very cheaply
> made cm-8, have all long since either blown their high voltage circuitry or
> their crt's have faded away into the sunset.
>
>A broadcast tv monitor is generally available yet, but at stratospheric
> prices (probably over $700 for a crt type, more for modern lcd stuff)
> because of the low production level required to fill that market.
>
>Most (99.9% or more) of the 9 pin monitors are 31 khz vga, not 15.75 khz
> ntsc, and any attempt to slow the h-sweep of a vga designed monitor down
> enough to work with ntsc will let the smoke out of its horizontal and high
> voltage circuits in milliseconds.  Litterally.
>
>Your best bet today is a scan doubler adapter such as Roy Justice has been
>making for us for the last year or so, and which plugs directly into the 10
>pin on the bottom of the coco3 and drives a vga (31khz hscan rate) monitor,
>one of those "5 dollar" models quite nicely, although you may find it has a
>dead color gun at that price range.  And its probably not any more expensive
>than some of the ebay auctions might fetch for an original cable.  And it
> has the added plus of being a known to work solution, I have one.
>
>Roy, speak up, here's a customer!
>
try RJRTTY at aol dot com

>>Thank you
>>
>>Derek
>>
>>
>>
>>
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-- 
Cheers, Gene
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