[Coco] CoCo 3 RGB Pinout

Michael Graham mkgraham at gmx.com
Wed Jul 11 17:31:23 EDT 2012

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?


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