Instructions; Word Transmission Instructions - IBM 7090 Instruction-Reference

Indirect addressing controls are shown in Figure 5.2-1. Once an indirect addressing
condition is recognized, the IA control trigger is turned on to block normal operations
and an E cycle is initiated. When the E cycle is completed, the trigger is turned off,
and normal execution is resumed.
5.3.00 INSTRUCTIONS
5.3.01 Word Transmission Instructions*
Word transmission instructions are necessary to move information into and out of
the CPU. Factors must be brought in from core storage and results must be returned.
Instructions are available to move parts of words or whole words to or from core stor-
age.
Store STO +0601
(I, E)
Figure 5.3-1
This instruction moves a full word to core storage. The contents of the AC(S, 1-35)
replace the contents of storage location
X.
The AC is unchangedo The store prefix,
decrement, tag, address, and MF store control lines are activated so a full word can
be put into core storage.
Store Logical Word SLW +0602 (I,
E)
Figure 5.3-1
This instruction replaces the contents of storage location
X
with the contents of the
AC(P-35). The AC is unchanged. Execution of this instruction is identical to that of
store except for the routing of AC(P) to the storage register sign position. AC(P-35)
is gated to SR(S-35) on Systems 2. 12.02.
1.
Store MQ
STQ -0600 (I,
E) Figure 5.3-1
The contents of core storage location X are replaced by the contents of the MQ(S, 1-35)
register. The contents of the MQ are unchanged. This instruction operates similarly
to store, except that the word sent to the SR comes from the MQ rather than from the
AC.
Store Zero
STZ +0600(1, E) Figure 5. 3-1
This instruction causes zeros to be placed in all positions of storage location X.
The operation of this instruction is similar to store, except that nothing is put on the
SB. Therefore
t
when the storage bus is gated to core storage, zeros are put into that
location of storage.
Store Prefix STP +0630 (I, E) Figure 5.3-2
This instruction places the contents of AC positions (P, 1 and 2) into core storage
location X, positions (S, 1 and 2). The contents of the AC and storage positions ( 3
through 35) are unchanged. MF store prefix and MF store control are activated to cause
core storage to store what is on SB(S, 1 and 2). To get the information to the storage
bus, it must be moved from the accumulator to the SR.
*See Store Location and Trap, and Figure 5.3-34.
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