=> R0 = 198
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = previous file handle
R2 corrupted
This call reads or sets the *Exec file handle. A handle of 0 means that Exec is disabled. A non-zero handle means that Exec is enabled, and hence is the current input stream.
See PRM 1, page 877
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