look here http://www.patentstorm.us/patents/5793351/description.html
and discard the datashet by registering.
It's an evolution (probably by TMS people) of the tms9918, featuring:
scroll registers
screen 2 like mode doubled in resolution
a screen 5 like mode
512 colors of palette?
10 hw sprites on a scan line.
and not clear multicolor sprites.
Also there is some sort of sprite group collision using the 3 color attribute bit that are unused on tms.
I'm wondering what would be msx with this chip inside instead of the originally 9918......
Take a look....
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I'll build one, hopefully I won't get sued