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Maintenance Panel Operating Procedures
3-8.
PREPARATION FOR USE
To use the Maintenance Panel, make preparation as follows:
•
Ascertain that the computer system is not in use.
•
Inform potential users that the system is unavailable until further notice.
•
Set the SYSTEM DC POWER switch (at the top of bay 1) to the STANDBY position.
•
Install maintenance panel interface (MP!) PCA 30354-60003 in slot 1 of the CPU card cage.
•
At the front of the MPI PCA, set switch Sl to the NORMAL position. (This switch is labelled
NORMAL/LAMP TEST/SWITCH TEST.)
•
Make the connections shown in figure 3-4.
•
If required, install the 30354-80012 I/O overlay over the REGISTER DISPLAY lamps. If using the
CHANNEL STROBES side of this overlay, connect jack J3 on the MPI PCA to J1 on the selector
channel maintenance PCA.
•
Set to the down position all bistable switches on the Maintenance Panel.
•
Apply power to the computer system.
3-9.
GENERAL OPERATING METHOD
When using the Maintenance Panel, operate switches to achieve the desired results, observing indica-
tions shown by the lamps. Refer as necessary to table 3-1 and the applicable program documentation.
To prevent unauthorized use of the Maintenance Panel, set switch Sl on the MPI PCA to the SWITCH
TEST position. This prevents Maintenance Panel switch information from entering the computer system.
Note that if a power failure occurs with Sl at SWITCH TEST, the switch must be returned to the
NORMAL position to permit initialization of the computer system for restart after power is restored.
3-10.
SWITCHES AND INDICATORS ON BAY 1 CONTROL PANEL
When the Maintenance Panel is in use, switches and indicators on the bay 1 control panel function in the
normal manner. The following points apply:
•
The CPU can be started or halted either by the RUN-HALT on the Maintenance Panel or by the
RUN/HALT switch on the bay 1 control panel.
•
If the LOAD switch on the bay 1 control panel is used, the appropriate information must be set into
the SWITCH REGISTER on the bay 1 control panel. Similarly, use of the LOAD switch on the
Maintenance Panel requires that the SWITCH REGISTER on the Maintenance Panel be used.
•
The RSW instruction acquires the 16-bit word which is in the SWITCH REGISTER on the bay 1
control panel, as in normal operation.
3-11.
STACK REGISTER LOADING
Because of the queue-down function which occurs when the CPU halts, stack registers must be loaded at
their location in memory. For test purposes it is possible to load the stack registers which are on the S bus
PCA and R bus PCA; however, when queue-up takes place after the CPU is started, the register contents
will be destroyed.
3-19
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