=> R0 = 62, &3E (Read save area size)
R1 = Sprite area
R2 = Sprite name/pointer, or 0 for the screen
<= R3 = Size of required save area in bytes
This calculates the size of a save area for the given sprite. It is constant for a particular release of RISC OS but may change in the future.
For the first use you should set the first word of the save area to 0 so that the area can be initialised; subsequently it will be updated by the OS.
See PRM 1, page 815
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