Xerox 560 Reference Manual

SET ALARM INDICATOR
The
following configuration ofWD is used to set the ALARM
indicator on the maintenance section of the processor con-
trol panel:
If the processor is in the RUN mode and the AUDIO switch
on the maintenance section of the processor control panel
is in the ON position, a 1000-Hz signal is transmitted to
the basic processor speaker. The signal may be interrupted
by changing from RUN mode to IDLE mode, by moving the
AUDIO switch to the OFF position, or by resetting the
ALARM indicator.
RESET ALARM INDICATOR
The following configuration of WD is used to reset the
ALARM indicator:
The ALARM indicator is also reset by either the RESET BP
or the RESET SYSTEM Command entered from the operator's
contro I conso Ie.
TOG G LE PROG RAM-C ONT ROLLED-FREQUENCY
FLIP-FLOP
The following configuration of WD is used to set and reset
the basic processor program-controll ed-frequency (PCF)
flip-flop:
The output of the PCF flip-flop is transmitted to the basic
processor speaker through the AUDIO switch on the main-
tenance section of the System Control Panel. If the PCF
fl ip-flop is reset when the above configuration of WD is
executed, the WD instruction sets the PCF flip-flop; if the
PCF fI ip-flop was previously set, the WD instruction resets
it. A program can thus generate a desired frequency by
setting and resetting the PCF flip-flop at the appropriate
rate. Execution of the above configuration of WD also re-
sets the ALARM indicator.
LOAD INTERRUPT INHIBITS
The
following configuration of WD can be used to transfer
the contents of the specified R register (R29-31) to the
Interrupt Inhibit field (PSWs
37
_
39
).
Affected: (PSWs
37
_
39
)
(R
29
-
31
) - PSWs
37
_
39
TURN ON MODE ALTERED FLAG
The following configuration of WD is used to set the Mode
Altered Flag (PSWs 61) to 1:
TURN OFF MODE ALTERED FLAG
The following configuration of WD is used to reset the Mode
Altered Flag (PSWs 61) to 0:
STORE
IN LOW MAIN MEMORY
This instruction writes into main memory locations 0-31
(locations 0-15 shadowed by the general purpose registers
and reserved locations). This allows storing or changing the
Status Stack Pointer Doubleword in locations 0-1 and the
default Program Status Words (Status Stack is empty) in
locations 2 through 4. .
If the R field is nonzero, the contents of R are stored in the
main memory location identified by bits 27-31.
TRAP TO LOCATION X
'
47
1
This instruction causes the basic processors to trap to loca-
tion X'471.
A line in the Processor Bus is raised by the initiating basic
processor (or the associated PI). This line, when true, causes
the basic processors to trap to X
'
47
1
(including the one that
executes the instruction).
Control Instructions 125

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