[Coco] CoCo3 RGB port question...

Zippster zippster278 at gmail.com
Sat Dec 30 19:18:29 EST 2017

Hello everyone,

On the CoCo3’s RGB port, pin 10 is held high by a pull up and goes to PB3 (PIN 13) of PIA 1 (Audio).

I vaguely remember a thread long ago discussing this that basically seemed to relate that this was
intended as some sort of display ‘sense’ pin, to be used to detect the presence of an RGB monitor.

From what I remember it was also said that this feature was never used to anyone’s knowledge.

Does anyone know if this is true, or exactly what the deal is with this pin?

- Ed

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