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DATA 620/i SYSTEM REFERENCE MANUAL . - Al Kossow's Bitsavers

DATA 620/i SYSTEM REFERENCE MANUAL . - Al Kossow's Bitsavers

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~<br />

Exclusive-OR Memory Timing: 3 cycles<br />

and A Extended (optiona I)<br />

n<br />

n+l<br />

17 16 15 14 13 12 11 10 987 6 5 4 3 2 1 0<br />

r-r-<br />

I I 00 13 X<br />

1---1--<br />

I I I Operand Address<br />

t2 L -<br />

l8-bit<br />

option<br />

An exclusive-OR operation is performed between the contents of<br />

the A register and the contents of the memory location as<br />

addressed by the operand address in location n + 1. The resu It<br />

is placed in the A register. If the same bit position of the<br />

memory location and the A register contains a zero, or if both<br />

bit positions contains a one, the result is zero. The truth table<br />

is shown below, where n = bit position:<br />

A(n)<br />

Condition<br />

Effective<br />

Memory<br />

Location (n)<br />

Result<br />

A{n)<br />

0 0<br />

0 1<br />

1 0<br />

1 1<br />

0<br />

1<br />

1<br />

0<br />

Indexing: Yes<br />

Indirect Addressing: Yes<br />

Register <strong>Al</strong>tered: A<br />

3-57

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