Sense Indicator Instructions - IBM 7090 Instruction-Reference

Set Sign Minus
SSM -0760 ... 0003(1, L) Figure 5.3-50
This instruction places a one (a minus) in the accumulator sign position. Positions
(Q-35) of the accumulator are unchanged.
Change Sign
CHS +0760 ... 0002(1, L) Figure 5.3-51
This instruction complements the sign position of the accumulator. A one is re-
placed by a zero and a zero is changed to a one. Positions (Q-35) of the accumulator
are unchanged.
5.3. 09 Sense Indicator Instructions
The sense indicator instructions are a group of instructions which operate on the sense
indicator register. These instructions enable the computer to set and test the indicators
under program control.
Load Indicators LDI +0441 (I, E) Figure 5.3-52
The contents of storage location X (S, 1-35) are placed in indicator positons (0-35).
The contents of storage are unchanged.
Store Indicators STI +0604(1, E)
The contents of indicator positions (0-35) replace the contents of storage location X.
The indicators are unchanged. Execution of this instruction is the same as STO
(Figure 3.5-1, Section 3.5.01) except that SI(0-35) is taken to the SR rather than AC
(S', 1-35). SI(0-35) to the SR(S, 1-35) is shown on Systems 2.12.13.1.
OR Storage to Indicators OSI +0442(I,E)
Figure 5. 3-52
This instruction places the logical OR of the word at storage location X and the
contents of the indicators in the sense indicator register. Storage is unchanged.
Invert Indicators from Storage
lIS +0440(1, E) Figure 5. 3-52
This instruction inverts the positions of the SI register which have corresponding
"1" bits in the word at storage location X.
Reset Indicators from Storage RIS +0445 (I, E) Figure 5.3-53
This instruction utilizes the word at storage location X to reset the sense indicator
register position. A "1" bit in any position of the word causes the corresponding sense
indicator trigger to be turned off. Indicator positions which correspond to "0" bits are
unchanged. Storage is unchanged.
Set Indicators of Right Half
SIR +0055(1) Figure 5.3-54
For this instruction, the control field (18-35) of the instruction is OR led with the
right half of the sense indicator register. A "1" bit in either the control field or the
indicator places a "1" bit in the corresponding sense indicator. Because the only
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