=> R1 = pointer to 20-word palette block
<= R0 corrupt
This SWI reprograms the Wimp-palette. In 16-colour modes, the video-palette is also reprogrammed, and in other modes the Wimp's colour lookup table may change.
You must force a redraw of screen. It causes Service_WimpPalette to be issued.
See PRM 3, page 190.
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