HP 9020 Service Manual page 237

110 Backplane Data
E-5
Table E-2. I/O Backplane Signal Definitions
Signal
Definition
-12
-- 12 volt supply.
-18
-- 18 volt supply.
12 12 volt supply.
18 18 volt supply.
5
5 volt supply.
AC-
25 KHz ac sine wave from power supply.
AC+ 25 KHz ac sine wave from power supply.
ClK Clock.
CClK Common clock.
CSAO Reserved.
CSA1 Reserved.
CSA2
Reserved.
CSA3
Reserved.
CSA4
Reserved.
CSBO
Reserved.
CSB1
Reserved.
CSB2
Reserved.
CSB3 Reserved.
CSB4 Reserved.
CSB5 Reserved.
CSB6
Reserved.
CSB7 Reserved.
CSRS
Reserved.
CSWS
Reserved.
DATAO
Reserved.
DATAl
Reserved.
DATA2 Reserved.
DATA3 Reserved.
DATA4 Reserved.
DATA5 Reserved.
DATA6
Reserved.
DATA7
Reserved.
DGND
Dirty ground return.
ORIN Reserved.
DROUT Reserved.
DSIN
Reserved.
DSOUT
Reserved.
GND
Ground plane of 110 backplane.
INTO
Reserved.
INTI Reserved.
NARQ
HP-IO card requests attention (negative true).
NBR
110 bus burst mode DMA request (negative true).
NDBYT
110 bus ready for data (negative true).
NDEND I/O bus device end (negative true).
NDPA
Internal select code available (negative true).