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Sys tern Ver ifi ca tion and Tr oubleshoot ing
Table 3-2. Maintenance Panel Switches and Lamps (Continued)
I-"-~-l--'----"-'---'-----'- T ---'---'---"~----'----------'-----'---'-
-'--'-------'1
IPanell Panel Marking
1
Use
I
1
Row
I
I
I
I
I
I
1
----I----·----~-_
. . _·-
-.-.---~.-.--.---.---.---,-----.--.---.--
. . - .-.--'-.--.--_.
11
1
CLOCK INHIBIT/
In the INHIBIT position, this switch
I
FREE RUN
permits the CPU to execute one machine
I
(bistable
cycle each time the CLOCK SINGLE CYCLE
I
sw itch)
sw itch is pressed.
In the FREE RUN po-
I
sition, the CPU operates continuously
using either internal or external clock
pulses.
11
12
CLOCK SINGLE
CYCLE (spring-
retur n sw itch)
REGISTER
SELECTION
(lamps and
center-off
spr ing-return
sw itches)
When enabled by the CLOCK INHIBIT/FREE
RUN switch, pressing this switch causes
execution of one CPU machine cycle.
When pressed up or down, each swi tch
lights the lamp above or below it, and
turns off any other lighted lamp in the
group.
The lighted lamp identifies the
register displayed by the REGISTER DIS-
PLAY lamps.
The B14 and B15 lamps re-
main extinguished except as stated be-
low.
The lighted REGISTER SELECTION lamp also
identifies the register which will be
lo~ded
by either of the LOAD REGISTER
sw itches.
The following registers cannot be loaded
by the LOAD REGISTER FROM SW RGTR
switch; these are identified below as
"display only" registers.
Special com-
I
ments are as follows:
OPND, display only.
PADD, display only.
CP
Xl, display only.
CPX2, d isplay only.
SR, display only
MOD NO., display only.
The module
number appears in positions 5,
6,
and
7
of the REGISTER DISPLAY lamps.
REGISTER DISPLAY lamp 13 is lighted
indicating CPU No.1.
IDN, display only.
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3-16
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