IBM System/370 145 Reference Summary page 128

Byte Bit
DIAG -02
0 Z/0 Stop or Preserve
RD021
Bad Parity
1
Multifunction Bit
2
Force Z-Reg Parity Bits
0 3 Diag 0
Suppress All Traps
4
Diagnostic Group Gate 1
5
Diagnostic Group Gate 2
6
Diagnostic Group Gate 3
7
Diagnostic Group Gate Delayed Pulse
0 Selector Channel
RD024
Force Trap Bit 4
1 Selector Channel
RD023
Force Trap Bit 5
2
Selector Channel 4
RD021
Priority Request (H4)
1 3 Diag 1 H3 Trap Request
4
Selector Channel Check Indicator
5
Spare
6 Spare
7
Diagnostic Key (Display Only)
0
Main Storage Size:
RD051
1 1 = 112K 4 = 256K
2 2 = 160K 5 = 384K
2 3 Feat 2 3=208K 6=512K
4 IFA
5
Channels (I FA Counts as 1 Channel)
6
00 = 1 01 = 2 10 = 3 11 = 4
7
Word Buffer
0 Spare
RD052
1 3215
2 Second SELECTRIC
3 3 Feat 3 Spare
4 CPU Timer
5 Spare
6
Spare
7
Direct Control
Byte Bit Ext Address
03
This facility is not used on the 3145.
Ill
11.4