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80 column extended rgb card problem



Hi all;
 I am having difficulty getting RGB output from the 80 column extended RBG
card in an apple IIe. I get a black screen when a standard RGB monitor is
connected. The connector is putting out composite signal, that I am sure
of.Trying different monitors, I found one that has the skewed composite
output. Output is normal on the composite connector, both in 40 and 80
column mode. Is there a control, or escape sequence that will switch the
output to RGB? I have no documentation.

Thanks ahead of time