Preparation For Use - HP 3000 III Series Manual

Sys tern Ver ifica tion and Tr oubleshoot ing
Table 3-2. Maintenance Panel Switches and Lamps (Continued)
Use
---r--
Marking
I
I
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--1--------·-·-------
EXECUTE SINGLE
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If the instruction is of the double
INSTR (Cont)
1
stack type, the switch must be pressed
I
twice to execute both halves of the in-
1
struction. The first depression causes
1
execution of stack operation A. The sec-
1
ond depression causes execution of stack
1 operation B. If operation B is other
than Nap, bit 3 of the CPU Status Regis-
ter is set to 1 during stack operation
A. This bit is cleared at the start of
stack operation B. The P Register is in-
cremented during stack operation B un-
less B is Nap, in which case it is in-
cremented during A.
16
1--1-
IPanell Panel
I Row
I
I I
16 SYSTEM RESET
(spr ing-return
switch)
When pressed, this switch resets the CPU
and the I/O system.
16 LOAD (spring-
re tur n sw itch)
Stores in memory from an I/O device
specified in the SWITCH REGISTER
sw itches.
16 RUN HALT
(spr ing-return
sw itch)
Pressing this switch halts the CPU if it
is running or starts the computer if it
is halted. Both halves of a stack op in-
struction are always completed before
the halt takes place. If the CPU halts
while an SIO operation is in progress,
the SIO operation continues to its nor-
mal completion.
3-11. Preparation for Use
To use the Maintenance Panel, make preparation as follows:
a. Ensure that the computer system is not in use.
b. Inform potential users that the system is unavailable until
fur ther not ice.
c. For HP 32421A Series III systems, set the SYSTEM DC POWER
switch (inside top of CPU equipment bay door) to STANDBY.
For HP 32435A Series III systems, set the DC POWER switch (on
Power Control and Display Panel) to DISABLE.
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