HP 3000 III Series Manual page 121

System Verification and Troubleshooting
Table 3-2. Maintenance Panel Switches and Lamps (Continued)
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IPanell Panel Marking
I
Use
1
lbw
I I
I I I
16
16
16
16
sw itch)
LOAD REGISTER,
MEM ADDRS FROM
DISPL (spring-
return sw itch)
ADDRESS
CONTROL, DECR
ENABLE/INHI BI'l'
(bi stable
sw itch)
ADDRESS
CONTROL INCR
ENABLE/INHIBIT
(bi stable
sw itch)
MEMORY DISPLAY
(s p ring - ret ur n
sw itch)
REGISTER switches. The bank registers
may also be loaded, as explained in the
SWITCH REGISTER des cr iption above.
When pressed, the Memory Address Register
(SPO) is loaded with the bits displayed
by the REGISTER DISPLAY (0:15) lamps.
Also, the ABS-Bank Register is loaded
with the bits displayed by the REGISTER
DISPLAY B14 and B15 lamps. The MEMORY
DISPLAY or MEMORY STORE switch can' then
display or store at the 18-bit address.
When this sw itch is a tENABLE, the Mem-
ory Address Register (SPO) is decrement-
ed by 1 each time the MEMORY DISPLAY or
MEMORY STORE switch is pressed. (The
ADDRESS CONTROL INCR ENABLE/INHIBIT
switch should be at INHIBIT.
When this sw itch is a tENABLE, the Mem-
ory Address Register (SPO) is increment-
ed by 1 each time the MEMORY DISPLAY or
MEMORY STORE switch is pressed. (The
ADDRESS CONTROL DECR ENABLE/INHIBIT
switch should be at INHIBIT.
When this switch is pressed, the follow-
ing ta kes place:
The REGISTER SELECTION MEM DATA lamp
lights. Any other lighted lamp in this
gr oup goes out.
The REGISTER DISPLAY (0:15) lamps show
the contents of the memory address
specified by the ASS-Bank Register and
the Memory Address Registe r (SPO).
Lamps B14 and B15 remain extinguished.
The Memory Address Register (SPO) is
incremented or decremented by 1 if one
of the ADDRESS CONTROL switches is at
ENABLE. A carry from SPO does not en-
ter the ABS-Bank Register.
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