proud (soon to be) owner of a VAXstation 3100 - test-drb@ccmp.vtda.org

21 Sep 2012

...

  There is also a monochrome video signal available
from the frame buffer on the
 system board which is not usually used if you have one of the optional colour
 graphics cards:

 3. Monochrome ground
 9. Monochrome video 
What are the specs on this signal? Can I feed it to, say, a composite display?

It's the same as the GPX rate and the lower of the SPX rates - 54kHz horizontal,
60Hz refresh, 1024x864.

It is a 1V pk-pk 75 Ohm composite video signal but a TV rate only monitor is
not going to like the horizontal frequency.

Regards,
Peter Coghlan.