=> R0 = 49 (Read free space for disc or image file)
R1 = pointer to name of object
<= R0 = free space
R1 = size of largest object that can be created.
R2 = size of disc
Reads the free space on a disc or image containing a named object. For large discs you will have to call OS_FSControl 55 (RISC OS 3.60 and later).
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