AT&T 3B2 Off-Line Diagnostic Manual page 546

Phase Descriptions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Test Number: 4
Function: This test checks the Inexact "Sticky" (PS) and Mask bits (PM).
Procedure: An Inexact exception is caused by using the MAU RTOI instruction. It is
confirmed that an exception was generated. Then, Inexact exceptions are
blocked, and the procedure is repeated. It is confirmed that an exception was
not taken. In both cases, the MAU.-ASR is checked for correct flag values.
Hardware Tested: The MAU is tested.
Data Returned: The failing test number (last number displayed on the system console prior to
failure) is returned.
Notes: None
Test Number: 5
Function: This test checks the ASR Underflow "Sticky" (US) and Mask bits (UM).
Procedure: A MAU Underflow exception is caused by using the MAU division instruction.
It is confirmed that an exception was generated. Then, the Underflow
exceptions are inhibited, and the procedure is repeated. It is checked that an
exception was not generated. In both tests, the correct setting of MAU.-ASR
flag variables is checked.
Hardware Tested: The MAU is tested.
Data Returned: The failing test number (last number displayed on the system console prior to
failure) is returned.
Notes: None
Test Number: 6
Function: This test checks the ASR Integer Overflow (10) Indicator bit.
Procedure: An exception is generated by using the MAU FTOI instruction. The fact that
an exception was taken is confirmed, and the correct setting of the MAU.-ASR
flags is checked.
Hardware Tested: The MAU is tested.
Data Returned: The failing test number (last number displayed on the system console prior to
failure) is returned.
Notes: None
12·& OFF·LlNE DIAGNOSTIC MANUAL