=> R0 = The colour number to be poked into the screen.
R1 = r_bpp (0-5)
<= R0 = Colour mask to put in palette table
This SWI takes a colour bitmap and duplicates it to fill a word, creating a
mask as needed for r_palette in DSA mode. Eg if R0 = 7 and R1 = 2 on entry
then R0 = &77777777 on exit.
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