HP 3000 III Series Manual page 111

System Verification and Troubleshooting
Table 3-2. Maintenance Panel Switches and Lamps (Continued)

----l----'------I-------------~·--·---·-------------·
I Panel I Panel Mar king I
Use
I Row I I
I I I
----I-~-·------·---I----------
6
I SERVICE IN I Indicates a response to an lOP Service
I ( 1 amp) I Ou tor Da ta Poll.
I I
6
I DATA POLL I Indicates the lOP has received a request
I (lamp) I for a transfer to or from memory.
I I
6
I SIO ACTIVE I Indicates a multiplexed I/O operation is
I (lamp) I in progress.
I
6
I INBOUND (lamp)
Indicates the lOP is executing an in-
I
bound memory transfer.
6 DRT REQ (lamp)
6 JUMP (1 amp)
6 lOB ENABLE
(1 amp)
6 DRT STORE
(lamp)
6 I/O TIMER
(lamp)
6 XFER ERROR
(lamp)
6 INTRPT REQ
(lamp)
6 INTRPT POLL
(lamp)
6 INTRPT ACK
(lamp)
6 EXT INTRPT
(lamp)
Indicates the lOP has received a request
from an SIO mUltiplexer to fetch a DRT
entry.
Indicates the lOP is currently updating
the DRT pointer during the execution of
a jump order.
Indicates the outbound data is on the
lOP Bus.
I nd ica tes the lOP is upda ting the DRT
pointer.
Indicates the Service In signal has
failed to occur within a period of time
after a Service Out signal.
I nd ica tes an I/O da ta par i ty exi sts.
Indicates the state of the Int Reg line
from the devices.
Indicates the state of the Int Poll sig-
nal from the lOP to the devices.
Indica tes that an Interrupt Acknowledge
signal has been received in response to
an interrupt poll.
I nd i ca te san ex te r nal in te r r up t
ha
s bee n
acknowledged by the lOP.
3-11