[Coco] Fwd: CoCo 2 Factory Composite Video RE'd

[Zippster]

I put up some pictures to be certain we know which RF modulators we are talking about.

<https://sites.google.com/site/thezippsterzone/home/coco2-projects/identifying-rf-modulator-types-coco2 <https://sites.google.com/site/thezippsterzone/home/coco2-projects/identifying-rf-modulator-types-coco2>>

The Type A board is the one I’ve already prototyped.  I’ll be designing the Type B composite board in the next
day or two and ordering test boards.

- Ed


> Begin forwarded message:
> 
> Subject: Re: [Coco] CoCo 2 Factory Composite Video RE'd
> From: Zippster <zippster278 at gmail.com>
> Date: December 15, 2014 at 2:47:26 PM CST
> To: Gabriel Holland <yell0w_lantern at yahoo.com>, CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> 
> Hi Gabriel (and all),
> 
> I’m going to put up some pictures of the 2 types of CoCo 2 RF modulators that
> I know of tonight.  I will be making 2 different versions of the board (circuit will be the same).
> 
> The motherboard pinout is different for the vertical modulator and the dimensions/shape of the 
> composite board will be as well.  I don’t want to block access to any of the other chips on the
> board, especially the 6847 as I’m doing a remake of the Lowerkit next that will plug into that socket.
> 
> Bare pcb’s, kits, assembled, whatever people want is fine.  I’ll try to come up with prices later today.
> 
> Remember, the RF modulator does need to be removed for this to be installed.
> 
> - Ed
> 
> 
>> On Dec 15, 2014, at 2:14 PM, Gabriel Holland via Coco <coco at maltedmedia.com> wrote:
>> 
>> Didn't know there would be kits and fully assembled.  I guess I should clarify - I would like a fully assembled one, please. I have the vertical RF can, if that makes any difference.
>> 
>> 
>>    On Monday, December 15, 2014 3:01 PM, Al Hartman <alhartman6 at optonline.net> wrote:
>> 
>> 
>> Marty Goodman wrote two articles with the circuits for tapping a Monochrome 
>> and Color Monitor output on a Coco 1.
>> 
>> I linked to them in the CocoPedia: 
>> http://www.cocopedia.com/wiki/index.php/Marty_Goodman
>> 
>> There is also Dennis' TVBuff, the manual for which is in the MM archive.
>> 
>> -[ Al ]-
>> 
>> -----Original Message----- 
>> From: Zippster
>> 
>> I know you can tap, invert, and amplify the Luma signal for a monochrome 
>> display.
>> Two transistors and a few resistors, and three leads, Luma, +5v, and ground.
>> 
>> The Y output from the 6847 is an inverted Luma with composite sync.
>> 
>> - Ed 
>> 
>> 
>> -- 
>> Coco mailing list
>> Coco at maltedmedia.com
>> https://pairlist5.pair.net/mailman/listinfo/coco
>> 
>> 
>> 
>> 
>> -- 
>> Coco mailing list
>> Coco at maltedmedia.com
>> https://pairlist5.pair.net/mailman/listinfo/coco
>