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CGA/RGBI to analog RGB conversion circuit
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SeaGeelog: CGA/RGBI to analog converter board Copyright 2014 by Chris Osborn http://insentricity.com/a.cl/219 This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. http://creativecommons.org/licenses/by-sa/4.0/ This circuit is designed to convert a standard TTL level CGA/RGBI signal to analog RGB voltages. I have tested it with the output from my Commodore 128. It does *not* do any scan doubling or conversion to VGA frequences. The output will still be at the CGA/RGBI frequencies which works with old Apple or arcade monitors. I'm using a GBS-8200 clone to convert the SeaGeelog output to a VGA signal.