This is simply amazing.
I'm impressed.
I didn't think it was possible to get more than 16 colors from the CGA card and here is a demo showing over 1000 colors.
On a stock IBM 5150 PC from 1981
(video via 8088 MPH: We Break All Your Emulators « Oldskooler Ramblings, 
from a discussion at Hacker News).  
And for those of you who are curious as to how this was done,
there're indepth articles about the graphics programming
(via Hacker News)
and the sound programming
(again, via Hacker News).
 
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