=> R0 = 35 (Read free space 64)
R1 = pointer to pathname of any object on disc
R6 = pointer to special field, or 0 if none
<= R0 = bits 0 - 31 of free space
R1 = bits 32 - 64 of free space
R2 = size of largest object that can be created
R3 = bits 0 - 31 of disc size
R4 = bits 32 - 64 of disc size
This call reads the free space on the disc, implementing OS_FSControl 55.
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