2 CM FIELD-READ, COMPUTE. AND WRITE
A.
CM
=
0000 and 0010
-
WRI
TE
or
STORE
Either instruction sends a write call to memory if preceded by a read cycle.
B. CM
=
000/
- G
+
D-R
Signifies a compute cycle and does not ask for a read or write call.
C. CM
=
00/1 through 01//
-
IJ-MN
or
UV-MN
T-N
GUV-MN
All of these instructions send a read call to memory and provide the memory address.
IBM Confidential
19,