=> R0 = 24, &18 (Select sprite)
R1 = Sprite area
R2 = Sprite name/pointer
<= R2 = Address/Offset of sprite unless in wimp or system area.
This SWI is meant for selecting the given sprite for subsequent plotting with VDU 25,232-239. This usage is not recommended, but the side effect of returning the address is more useful.
See PRM 1, page 775
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