Apple III color video

[louiss@gate.net (Louis Schulman)]

I have an Apple III.  When I have asked about hooking up a color monitor to
it, I was told that the IIGS RGB can be plugged right in.  That is probably
true, given that the pinouts correspond, more or less.

I have several old RGB monitors (digital and analog) that will sync down to
15.75 mHz or so.  Using the Apple III and GS pinouts as guides, I made a 
cable.  

I got a nice color picture, although the monitors would only sync well in
analog mode, even though the output is digital.  I found, however, that there
were problems in the picture.

The GS has RGB on pins 2,5 and 9.  The III has RGB4, RGB1, RGB2, and RGB8
on pins 2,5,9 and 10.  Ignoring pin 10, and connecting the corresponding
pins, Red and Green are reversed (at least on my monitors).  This was easily
fixed by reversing the wires on pins 2 and 5.

However, not so easily fixed is the fact that only 8 colors are displayed, 
although 16 are supposedly available.  I imagine this is caused by the
absence of the pin 10 signal.

So, the following questions.  Does a IIGS monitor which is just plugged in 
with its usual cable have reversed red and green and only 8 colors?  If not,
why not?

How can I get 16 colors, and what is the signal on pin 10?

BTW, I do get an excellent 8-color picture on a Commodore 1084 monitor.  I
am using the Dealer Diagnostics program to test the color output.

Thanks, Louis