8 ALTERNATE CK FIELD
CK
=
000 I through 00 I I
-
STORE WRAP
These are 64K options.
9 CD FIELD-DESTINATION FOR THE ALU OUTPUT
A. CD
=
0000
c
+
D~Z
This signifies that the ALU output goes onto the Z buss but not into any register.
B. CD
=
0111
*
C
+
D-R
IJ-MN MS WRITE
*
-
C
+
D-R
IJ-MN
MS STORE
IBM Confident;'l
25

*
*
- 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
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