IBM System/370 145 Reference Summary page 121

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ABRTY Bit Group Gate 1
Reg*
0 Force ~tern Reset Tr~
1 Force Alter Display Trap
2 Force Set IC
Tr~
Byte
3 Force Control Word Address Trap
0 4 Force Instruction Ctr Match
5
Spare
6 Force Scan Storage Trap
7 Force Clear Storage Trap
0 Spare
1 Block DF Trap Inhibit
2 Allow Ext Interrupt Reg Set
Byte
3 Force Word Move Stop
1 4 Start Switch Reset
5 Block Reset CPU - Low
6 Spare
7 Force LS Address Check
0 Simulate Int Timer, TOD Enable CK
1 MPX Diagnostic Control
2 Spare
Byte 3 Force TOD Clock Error
2 4 Diagnostic Parity Mode (P21)
5 Diagnostic Ripple Mode (P21)
6 Spare
7 Spare
0 Spare
1 Spare
2
Spare
Byte
3
Reset Process Stop Latch
3
4 Diag Control SAR (STG)
5 Invert Z-Reg Parity Bits
6 Block A-Local Storage
7 Stop on Machine Check
*Note: Use inverted logic for diagnostic functions.
**Note: Also gated by early Group Gate 3.
DIAGNOSTIC FUNCTIONS
Group Gate 2 Group Gate 3
Force S-R~ Dup Check A **Diag I-Reg and Buffer Gating
Force S-Reg Dup Check B **Enable Generate Address
Force Ext XY Check **Enable
Force Dest Byte Control Check Spare
Force ALU Logical Check
Allow PAA Hold
Force LS Source/Dest X Check
Spare
Force LS Source/Dest Y Check Allow RF Read Out
Force B-Reg Shift Check Allow Set No Match and Force LRU Inv
Force Clock Control Check Spare
Force M-Reg Dup Check 1 Spare
Force M-Reg Dup Check 2 Spare
Force M-Reg Dup Check 3 Spare
Force M-Reg Dup Check 4 Spare
Force M-Reg Dup Check 5 Spare
Force M-Reg Dup Check 6 Spare
Spare Spare
Force Clock Sync Ck A-A1 & A-B1 Spare
Force Clock Sync Ck A-A2 & A-B2 Spare
Force Clock Sync Ck A-A3 & A-B3 Spare
Force Clock Sync Ck A-A4 & A-B4 Spare
Force Clock Sync Ck B-A1 & A-C1 Spare
Force Clock Sync Ck B-B3 & A-C2 Spare
Force Clock Sync Ck A-C3 Spare
Force Clock Sync Ck B-C3 & A-C4 Spare
Spare Spare
Spare Spare
Spare Spare
Reset Process Stop Latch Reset Process Stop Latch
Diag Control SAR (STG) Diag Control SAR (STG)
Invert Z-Reg Parity Bits Invert Z-Reg Parity Bits
Block A-Local Storage Block A-Local Storage
Stop on Machine Check Stop on Machine Check
10.3