CN field 0 bit
=
0 indicates the K addressable bytes 0 through 15 that will be addressed.
CN field 0 bit = 1 indicates the K addressable bytes 16 through 31 that will be addressed.
781
-
K=OlOO PO
ACLS
r
The 8 in the next address does have the CN 0 hit on.
10101100 - TO AC in HEX
t
K 0100 Specifies the K1 Bit on.
3 CU FIELD-AREA OF' MEMORY TO BE ADDRESSED
A. CU
=
0000
- IJ-MN MS
Signifies that main storage will be addressed.
B. CU
=
0001
- UV-MN LS
Signifies that local storage (CPU Bump) will be addressed.
IBM Confidential
21

c.
CU - 0010
- T-N MPX
Signifies that multiplex storage (UCW Bump) will be addressed.
D. CU - 0011
- GUV-MN
M/LS
Signifies that main storage will be addressed if the G register 0 and/or 1 bits are on (1),
and that local storage (CPU Bump) will be addressed if the G register 0 and 1 bits are off
(0)
4 ALTERNATE CU FIELD
A. CU
=
0001
- WRITE USE GR
Signifies that the selector channel data register GR is the destination for data instead of the
normal destination R register.
22
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Confidential
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