=> R0 = 21 (Read FS internal file handle)
R1 = (fileswitch) file handle
<= R0 preserved
R1 = filing system file handle
R2 = filing system information word
This SWI returns the internal file handle (as returned by FSEntry_Open) for a given file handle. If the fileswitch handle is invalid R1=0 on return. This SWI should only be used to implement a filing system.
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