RGB-VGA Converter -- buy or build?

As previously discussed in this list, and documented on http://www.oldskool.org/pc/cgacal , CGA monitors have circuitry to change color index #6 to a different color. CGA also has a fourth "intensity" pin. Does anyone know if some sort of specially-wired cable might be able to convert 4-pin RGBI to something these kinds of converters can take as input and everything will still look decently? I ask because I have a need to do video capture of native CGA output. Don't ask :-) The best solution I've come up with is to use an older VGA card (1990 or before) that comes with utilities to force it into CGA emulation -- forces 400 scandoubled lines, forces the 8x8 font, and ports react properly to MC6845 writes. This is 95% of the way there, but it's still a 70Hz refresh rate, not 60. All ideas welcome. On 3/9/2010 11:50 AM, Dan Roganti wrote: -- Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/ Help our electronic games project: http://www.mobygames.com/ Or check out some trippy MindCandy at http://www.mindcandydvd.com/ A child borne of the home computer wars: http://trixter.wordpress.com/