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| 8 Bit Logical Boolean Commands |
| By James Sulak |
| 10/2/96 |
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The results of these operations are left in the accumulator (A register).
The carry flag is reset in all logical operations. The Z, P, and S flags
are affected. The first table in the example is a chart of how the
operation works. The second is a sample problem with the result. The
third is an example mnemonic (s is and 8 bit register).
AND compares two bytes bit by bit. If a bit is set in both operands,
it is set to 1 in the result. Otherwise the bit is reset to 0 in the result.
A B A AND B 11000011 A Mnemonic:
1 1 1 AND 10100101 B AND s
1 0 0 -------------------
0 1 0 10000001 A AND B
0 0 0
OR operator compares two bytes bit by bit. If a bit is in either operand,
it is set in the result. Otherwise it is reset in the result.
A B A OR B 11000011 A Mnemonic:
1 1 1 OR 10100101 B OR s
1 0 1 -------------------
0 1 1 11100111 A OR B
0 0 0
XOR (exclusive OR) operator comares the two bytes bit by bit. If the
bit is set in either operand, but not in both, it is set in th
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