=> R0 = 199
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = previous file handle
R2 corrupted
This call reads or sets the *Spool file handle. A handle of 0 means that spooling is disabled, a non-zero handle means that spooling is enabled (unless disabled with OS_Byte 3). Changing the spool handle to an invalid file handle can really ruin your day (every call to OS_WriteC etc. will return an error, including the calls used to report the error to screen...).
See PRM 1, page 513
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