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