He's going the other way around. Trying to hook a
VGA monitor to an
RS/6000.
What signals do you get from the RS/6000? I am going to guess at RGB on
BNC sockets. with sync-on-green (this actually makes the green signal
look like a composite monochrome video signal).
Firsly, you need a monitor which will work at the right scan rates.
Converting scan rates is a non-tricial project!. I have no idea what rats
an RS/6000 uses, though.
I believe some VGA monitors can handle sync-on-green, in which case all
you need is a cable adapter. Othes need separate TTL level sync signals.
You then need to build a sync separator, which you feed from the green
video signal. I've always found the LM1881 chip (National Semiconductor
originally, I think) or the improved versions from companies like Elantec
work well here -- I am sure data sheets are on the web somewhere.
-tony