HP 3000 III Series Manual page 113

System Verification and Troubleshooting
Table 3-2. Maintenance Panel Switches and Lamps (Continued)
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. . - ·-----.--.-.--
I
Panel
1
Panel Marking
1
Use
I
Row
I 1
1 I I
(bi stable
sw itches)
Jump resul ting from the V-Bus contents
being equal to the contents of the
V BUS COMPARE REGISTER switches.
Jump resulting from the V BUS EXECUTE
JUMP switch being pressed.
11 V BUS COMPARE
ENAB LE/I NHI BIT
(bi stable
sw itch)
Enables the V BUS COMPARE HALT/JUMP
sw itch.
11 V BUS COMPARE
HALT/JUMP
( bistable
switch)
When enabled by the switch listed above,
selects halt or jump when the V-Bus con-
tents are the same as the V BUS COMPARE
REGISTER switches.
11 V BUS COMPARE
HALT EXIT
(spr ing-retur n
switch)
When pressed, starts the microprogram
a fte r:
A hal t brought about by the· V BUS
COMPARE REGISTER switches.
A freeze brought about a CCPX-14
Special field microinstruction.
11
V BUS EXECUTE
JUMP (spr ing-
return switch)
When this switch is pressed, the micro-
program jumps to the address in the V
BUS JUMP REGISTER switches. This func-
tion should be used only when the com-
p ute r isha 1 te d •
Selects the REGISTER DISPLAY lamp read-
out as follows:
SINGLE CYCLE
REGISTER
DISPLAY,
REGI STER/U BUS
(bistable
sw itch)
11
With the switch at the REGISTER posi-
tion, the display is identified by
the lighted REGISTER SELECTION
lamp.
With the switch at the U BUS posi-
I
tion the U-Bus is displayed. For
1
this function, the CLOCK INHIBIT/
1
FREE RUN switch (panel row 11)
1
must be at INHIT (single cycle
I
operation).
I
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