And And Or Instructions - IBM 7090 Instruction-Reference

Load Index from Decrement
LXD -0534 (I, E) Figure 5.3-66
This instruction loads the specified index register with the contents of the decrement
field (3-17) of storage location X in true form. Execution of LXD is identical to that of
LDC, except that the complementing operation is not used.
5.3. 11 AND and OR Instructions
The AND and OR instructions are used to produce logical combinations of bits. These
are useful for masking or matching words.
OR to Storage
ORS -0602 (I, E) Figure 5.3-67
This instruction stores the logical OR of the word stored at location X and the AC
(P,I-35) in location X. The logical OR is obtained by matching the two words and stor-
ing ones in all positions which have ones in either word. For this instruction, the OR is
developed in the memory data register during the E cycle. The words from core stor-
age and the SB both go the memory data register and the result in the memory data regis-
ter is put back into core storage.
OR to Accumulator
ORA -0501 (I, E) Figure 5. 3-68
This instruction places the logical OR of the word stored at locationX andAC(P-35) in
the accumulator. The OR is produced by matching the two words and placing ones in all
positions of the AC which have ones in either word. The OR is developed in the SR by
gating both the storage and AC words into the SR at the same time. Sand Q remain unchanged.
AND to Accumulator
ANA -0320 (I, E, L) Figure 5.3-69
This instruction places the logical AND of the word stored at location X and the AC
(P, 1-35) in the accumulator (P,I-35). The logical AND is obtained by matching the two
words and placing ones in all positions of the accumulator which have corresponding
ones in both the AC and storage. This instruction is executed by OR'ing the complement
of both words and then complementing this sum.
AND to Storage
ANS +0320 (I, E, L, E) Figure 5.3-69
This instruction stores the logical AND of the word stored at location X and the
contents of the AC (P, 1-35) in location X. The logical AND is obtained by matching the
two words and placing ones in all positions of storage location X which have corre-
sponding ones in both the AC and storage. The contents of the AC(S, Q, P, 1-35) are un-
changed. The AND is accomplished the same for this instruction as for ANA. An addi-
tionalE cycle is requiredto put the AND in storage. The complement of the original AC
(P, 1-35) is returned to the AC and re-complemented to trestore the contents of AC (P, 1-35).
During the execution, the original AC(Q) is saved in SR(Q) and then returned to AC(Q).
Exclusive OR to Accumulator
ERA +0322 (I, E, L)
Figu:r:e 5.3-70
This instruction matches AC(P, 1-35) with the logical word stored at location X. Zeros
replace all positions of the AC which match the corresponding positions of the logical
word. Accumulator positions (S) and (Q) are cleared.
128