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System Verification
Table 1-4. System Control Panel Switch and Lamp Functions
PANEL MARKING
CURRENT INSTRUCTION REGISTER
(lamps)
SYSTEM SWITCH REGISTER
(lamps and switches)
RUN
(lamp)
SYSTEM HALT
(lamp)
RUN/HALT
(switch)
ENABLE
(switch)
DUMP
(switch)
LOAD
(switch)
FUNCTION
Displays the content of the Current Instruction Register
Displays the contents of the switch register as deter-
mined by pressing the switches on or off. Switches
provide a 16-bit word to be used as a device number
and control byte for cold load procedure.
Indicates the system is executing a program
Indicates a system halt caused by an irrecoverable
error detected by the firmware.
Reverses the run/halt condition of the system.
Must be held in the ENABLE position to permit the
LOAD or DUMP switch function to become active.
Sends the contents of memory and CPU registers to a
device specified by internal DRT jumpers.
Used to load memory from a device specified by the
SYSTEM SWITCH REGISTER contents.
NOTE:
1. SWITCHES LOCATED BEHIND FACEPLATE
2. PLACARDING LOCATED ON REAR COVER PLATE
OF SYSTEM CONTROL PANEL
PF/ARS
PANEL
DSBL
ENBL
DSBL
EN BL
,
,
\
\
...
\ ,
...
\,
L_J
L
_J
CPU
RESET
CURRENT INSTRUCTION REGISTER
ele e ele e ele e ele e ele e e
o
1
2
3
4
5
6
7
8
9
13
SYSTEM SWITCH REGISTER
SYSTEM HALT
RUN
ele e ele e- ele e ele e ele e e
o
1
2
3
4
5
6
7
8
9
10
11
13
14
BBBBBBBBBBBBBBBB
DUMP
- - ENABLE
7522-17
Figure 1-1. System Control Panel
JAN 1977
1-5
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