=> R0 = reason code, and path bits if reason<>0
R1 = filename for opening files, handle otherwise
R2 = pathname, if 'path used' is 1 or 2.
<= R0 = file handle, if opening
This SWI opens and closes files according to the reason code
R0 Action
&00 Closes file R1, or all files if R1 = 0
&40 Open existing file with read-only access
&80 Create empty file with read/write access
&C0 Open existing file with read/write access
See PRM 2, page 72.
OS_Find path bits
Low bits Meaning
0-1 Path used
0 : File$Path
1 : String pointed to by R2
2 : Variable pointed to by R2
3 : None
2 If 1 then error if open existing dir
3 If 1 then error if file doesn't exist
4-5 0
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