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FrameThrower vs CAD Buffer II for XL1200 color graphics?

Does anyone have any experience in the performance advantages of the
FrameThrower board vs the regular CAD Buffer II for normal Symbolics
color graphics on an XL1200? By "normal" I am talking about using functions
in the Symbolics color system or just graphics:draw-xxx with :color
arguments, not anything with any of the S-products, HDTV, etc. We are
looking to speed up things like reopening windows, popping up menus,
drawing/animating simple graphics, etc, that take place on the color screen.
Ie the FrameThrower board is designed to do much more than act as a 
color graphics accelerator, but if it were used in that role, does
anyone know what kind of a performance benefit there would be?
Our local sales rep thought "significant" (or were they thinking of
the price? :-), but was a bit fuzzy.

					- Marty
hall@aplcen.apl.jhu.edu, hall%aplcen@jhunix.bitnet, ..uunet!aplcen!hall
Artificial Intelligence Lab, AAI Corp, PO Box 126, Hunt Valley, MD 21030