=> R0 = pointer to error block
R1 = &7 (reason code)
R2 = OS_Byte number
R3,R4 = R1,R2 passed to OS_Byte
<= preserve all regisers to pass on, else
R1 = 0 (claim service)
R3,R4 = R1,R2 to return to caller
This service is issued when an unknown OS_Byte code is given. You should use ByteV in preference to trapping this service.
See PRM 1, page 257
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