"you know what I'd do if I designed my own video card? two CGA cards at the same time." 
the composite waveforms are close but not an exact match.
but how can I tell if the colors are right? like exactly right?
with this cute little vector scope! it measures the phase of the color signal relative to the color burst.
people are asking how, since normally these cards occupy the same IO address and RAM address. well, the Gremlin is custom programmed to use the addresses normally used by MDA, since those cards can coexist!
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