Xerox 560

Table 24. Bit Assignments, Address Compare Register Q31 (X11 FI)
Bit
Position
Status Significance
0
1
Selects mapped address comparison.
0 Selects unmapped address comparison.
1
1 Selects address comparison during instruction access only.
0
Selects address comparison for all memory cycles.
2 1 Selects comparisons only during memory write cycle.
0 Selects all memory cycle comparisons.
3
1
Selects page comparisons.
0
Selects word comparisons.
4
1
System turns on audible alarm for 220 microseconds each time an Address Compare occurs
{maximum frequency 1KHz}.
0 Address match alarm is disabled.
5
1
The processor is forced into the HALT state when an Address Compare occurs.
0
Address Halt disabled.
6-7
-
Reserved.
8-31
-
Comparison address field.
166 Control Commands