PSW CR14 Bit 1 CR14 Bit 8
Bit 13 (Sl) (Al) MCEl Action
o X X MCEl does not occur.
1 0 o MCEL does not occur.
1 1 o MCEL may occur only during
machine-check interruption.
1
1 0 1 MCEL may occur at any time.
2
1 1 1 MCEL may occur at any time. CR14 Bit 9
(FL) Fixed-Logout Action
o Fixed-logout area may be changed by the CPU only during machine-check interruption.
1
1 Fixed-logout area may be changed at any time.
Explanation:
1
2
AL
FL MCEL Sl
X
Logout prior to instruction retry is not permissible in
this state even though recovery reports are enabled.
In some models, the asynchronous machine-check extended­
logout control (AL) is ignored, and no logout occurs in
this state.
Asynchronous machine-check extended-logout control.
Asynchronous fixed-logout control.
Machine-check extended logout.
Synchronous machine-check extended-logout control.
Indicates that the same action occurs whether the bit is
zero or one.
Machine-Cheek-Logout Control Control State of Bit
Register 14 on Initial
Bit Description Bit Position CPU Reset
Check-stop control 0 1
Synchronous MCEL control 1 1
IOEL control 2 0 Recovery subclass mask 4 0 Degradation subclass mask 5 0 External-damage subclass mask 6 1
Warning subclass mask 7 0 Asynchronous MeEL control 8 0 Asynchronous fixed-logout control 9 0 Machine-Check Control-Register Bits Chapter 11. Machine-Check Handling 11-31