RCA 70/46 - And (Nr) (N) (Ni) (Nc)

AND
(NR) (N) (NI) (NC)
General Description
Format
(RR)
(RX)
(51)
(55)
Condition Code
Interrupt Action
Notes
Logical
Instructions
• These instructions perform a logical "AND" operation on two operands
bit-by-bit according to
the following rules:
Rules of Logical "AND" Operation
If Bit in
And Bit in Then Bit in
First
Operand is
Second
Operand is Result is
0
0 0
0
1 0
1
0 0
1
1
1
The logical product of the operation is placed in the location specified
by the first address (R
1
or B1/D
1
)
and determines the condition code.
(NR) 14
I
Rl
I R2
0
7 8 11 12 15
(N) 54
I
Rl
I
X
2
0
7
8
11
12 15
(NI) 94
12
0
7
8 15
I
(NC) D4
I
L
0 7
8
15
• 0 - result is zero.
1 - result not zero.
2-not used.
3-not used.
• Address error:
I
I
B2
16 19 20
I
Bl
I
16 19
20
I
Bl
I
16 19 20
Addressing (RX, SI, SS only).
Protection (SI, SS only).
Specification (RX only).
D2
31
Dl
31
Dl
B2
D2
31 32 35 36
47
• 1. The second operand is unaltered, unless operands overlap in the
SS format.
2. In the SI format, the immediate byte in the 12 field of the instruction
being executed is the second operand.
3. Processing is
from left to right.
4. All operands and results are valid.
5. The "AND" instruction is also used to set a bit to zero.
175