[Coco] CoCo 3 RGB Pinout

Rogelio Perea os9dude at gmail.com
Wed Jul 11 21:09:38 EDT 2012

>From what I can remember it was supposed to be a "hardware key" to allow
the CoCo to detect automatically what type of monitor it had attached to
it, and set its PALETTE of colors accordingly: TV/Composite or Analog RGB.

-- RP

On Wed, Jul 11, 2012 at 5:31 PM, Michael Graham <mkgraham at gmx.com> wrote:

> I have a question about the CoCo 3 RGB pinout for those of you who might
> know.  All the pinout sources I've found list pin 10 of the connector as
> 'no connection', but upon investigation of my CoCo 3 circuit board (and the
> schematic I found online) it is in fact connected to pin 13 (PB3) of the
> 68B21, with a pull-up to +5v.  What purpose is this pin actually supposed
> to serve?
> Thanks,
> Michael

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