Xerox 550 - Bit Assignments, Address Compare Register

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 1 KHz).
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.
Control Commands 149