*
*
- c
+
D-S G
+
R-R
---
IJ-MN MS
T_N
LS
*
'--
G +
C-R
WRITE
The
*
signifies the only time that the R register can be used as a destination.
10 CF FIELD
A.
CF
=
0000 through 00 II
- DL +
This signifies that the ALU-A register entry can be blocked, just the Low 4 bits can be
gated, just the High 4 bits can be gated, or all bits can be gated.
B. CF
=
0101 through 0111
- DXL
+
26 IBM Confidential

This signifies that the
ALU-A
register entry can be crossed, Low 4 bits to High 4 bits and
vice versa, and just the low, or high, or all bits can be gated.
11 CG FIELD
CG = 0000 through 00 II
- G + 0
This signifies that the
ALU-B
register can be blocked, and that just the low, or high, or all
bits can be gated.
12 CC FIELD-CARRY INPUTS AND OUTPUTS
A. CC = 0001
- R+D+l-G
The 1 in this statement forces the carry-input line to a
1.
B. CC = 0010
- G • D-R
G
=
01001001
o
=
01000001
R- 01000001 result
The AND function (.) requires a coincidence of bits to obtain an output.
IBM Confitlenlilll
27