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5. OPERATOR CONTROLS
The standard SIGMA 6 system has a processor control panel
(PCP) mounted on one of the central processor cabinets.
This panel serves as an operator's control center.
PROCESSOR CONTROL PANEL
The processor control panel (see Figure 7) has two distinct
functional s'ections.
The upper section (labeled MAINTE-
NANCE SECTION) is reserved for maintenance controls and
indicators, and the lower section contains the controls and
indicators for the computer operator.
POWER
The POWER switch controls all AC p,ower to the central
processor and to all units under its direct control.
The
POWER switch is unl ighted when the AC power is off, and
is lighted when AC power is on.
The POWER switch is
always operative.
CPU RESET/CLEAR
The CPU RESET/CLEAR switch is used to initialize the cen-
tral processor. When this switch is pressed, the following
operations are performed:
1.
All interrupt levels are reset to the disarmed and dis-
abled state.
2.
The ALARM, WRITE KEY, INTRPT INHIBIT, POINTER,
CONDITION CODE, FLOAT MODE, MODE, and
TRAP indicators are all reset to O's (turned off).
3.
The INSTRUCTION ADDRESS indicators are set to
X'25'.
4.
The DISPLAY indicators are set to X '02000000', which
is a LOAD CONDITIONS AND FLOATING CON-
TROLS IMMEDIATE (LCFI) with an R field of 0 to pro-
duce a "no operation" instruction.
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Figure
8,
Processor Control Panel
Operator Controls
93
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