IBM System/370 145 Reference Summary page 129

Byte Bit
SPTL - 04 (Also OC, 1C,2C,3C,14,24,34)
0
True/Complement Addition
1
Decimal= 1 if Invalid Digit; Binary= 1
Carry-Out of Bit One
2
Equals 1 if Z-Bus Not Zero
0 3
s
Carry-Out of Bit Zero
4
ALU Result 0-3
=
0
5 ALU Result 4-7 = 0
6
General Purpose Stats
7 RS125 RS225
0 Expanded LS A Source
1
f
Used with L-Reg to Form Indirect
2
LS Address
1
3 p
External Address if C1 Bit 0
=
1
4 Expanded LS B Source
5
6
} Used With C1 ,C2 to Form Direct LS Address
7
RP011 RP012
0
J
1
2
TH - Mask for Store Word Function
' 2
3
4
f
5 TA- Byte Pointer for Indirect Byte
A Source
6
f
7
TB - Byte Pointer for Indirect Byte
B Source
RT012 RT013
0
L
~
1
2 LH - L High
~
3 The L-Reg holds intermediate
byte operand(s).
4
f
5
6 LL- L Low
7
RL011
ID
11.5