=> R0 = 55 (Read free space for a large disc or image file)
R1 = pointer to name of object
<= R0 = least significant word of free space
R1 = most significant word of free space
R2 = size of largest object that can be created
R3 = least significant word of disc size
R4 = most significant word of disc size
Reads the free space on a disc or image containing a named object. This call is only implemented in RISC OS 3.60 and later - if an error is returned try OS_FSControl 49 for the prior implementation.
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