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=>     R0 =     reason code
     R1 =     file handle
     R2 =     (attribute)

Note that RISC OS fails to follow the notes in the PRMs, as the filehandle given by (R1 AND &FF) is actually checked on current versions of RISC OS.

Reason codes :
0     Read pointer/FS
1     Write pointer
2     Read extent
3     Write extent
4     Read allocated size
5     Read EOF status
6     Reserve space
7     Read pathname of open file
8     Inform of changed image stamp
9     IOCtl
254     Read info on file handle
255     Flush file(s)