=> R0 = 0 (Set current directory)
R1 = pointer to (wilcarded) directory name
R6 = pointer to special field, or 0 if not present
This call is only made by RISC OS 2 (or to perform *Opt 1 when bit 23 of the filing system information word is clear. Not that the PRM says how). If the directory name is null you should set the current directory to the user root directory. This call should not make the FS current - you should provide a separate command to do this.
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