On May 23, 2015, at 12:35 PM, Chris Elmquist <chr...@pobox.com> wrote:

> The GBS-8200/8220 does support CGA 

The GBS-8200/8220 supports analog signals, not digital. It will directly 
support the 15khz misnamed “CGA” of arcade monitors (which is the same RGB 
signal the IIgs puts out), but that’s an analog signal, not digital. For use 
with the Commodore 128 I had to build a small circuit which converts the RGBI 
signal to analog RGB.

In the case of the BBC Micro which also puts out 5V TTL digital RGB, I didn’t 
bother with lowering the levels since the GBS-8200 didn’t care and I didn’t 
need to deal with a 4th intensity signal.

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