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Section 2. Features
2.10 DUAL PROGRAM CONTROL PANEL
The dual program controls (Figure 2-17) consist of:
2.10.1.1 Message Display Units
A message display unit is provided for each program level.
These units operate in the same manner as the message
display unit in the system controls.
2. 10. 1.2 Process Lights
These lights indicate which_program level is functioning at
any time. If an interrupt is being serviced, this indicator
shows which index registers and program status register
are in use.
2.10.1.3 Halt Reset Keys
These keys are used to take a program level out of the
programmed halt state. Pressing either of these keys clears
the corresponding message display unit and allows the
corresponding program to continue its normal operation.
2.10.1.4 Interrupt Key/Light
Pressing this key when it is illuminated causes the program
in operation at that time to halt its normal operation and
enter the interrupt-handling subroutine for interrupt level
0.
Normal programmed operation will be resumed after the
interrupt routine signals completion of interrupt servicing
with a start 1/0 instruction to reset interrupt request 0.
The interrupt key is lighted only when the system is in dual
programming mode and interrupt level
0
is enabled. Selec-
tion of whether the system is to be used in the dedicated or
the dual programming mode is accomplished via the start
1/0 instruction. The start 1/0 instruction is also used to
enable or disable the use of interrupt level 0.
2.10.1.5 Dual Program Control Switch
This rotary switch is normally used in conjunction with the
console interrupt key. The status of this switch is sampled
by the test-1/0-and-branch instruction.
2.11 FILE CONTROL PANEL
The file controls (Figure 2-18) consist of:
2. 11. 1. 1 Program Load Selector Switch
This switch is used to select the unit from which program
loading is to be done. The fixed disk and removable disk
positions refer to drive 1 only.
2. 11. 1.2 Start/Stop Switches
These switches (one per drive) turn the disk drive power on
or off when system power is on. With the switch in the off
position, the removable disk can be replaced.
P1
DUAL PROGRAM
CONTROL
P2
,-, ,-,
I I I
I
~
(Program Level 1
Message Display Unit)
HALT
RESET
OFF
U-
PI
~FCU ~MFCU
AUX
AUX
LOAD
P-KB
P-KB
CANCEL
CANCEL
Figure 2-17. Dual Programming Control Panel
I I
I
I
I /I_/
,~,
(Program Level 2
Message Display Unit)
HALT
RESET
5410 FEMM (1/71) 2-25
E
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