HP 9020 Service Manual page 238

E-6
110 Backplane Data
Signal
Definition
NFLG
lIO bus ready for data (negative true).
NICI
lIO bus interface control bit 1 (negative true).
NIC2
lIO bus interface control bit 2 (negative true).
NIC3
lIO bus interface control bit 3 (negative true).
NIC4
lIO bus interface control bit 4 (negative true).
NIDO
lIO cage door open (negative true).
NIFC lIO bus interface clear (negative true).
NIODO
lIO bus input/output data bit 0 (negative true).
NIODI lIO bus input/output data bit 1 (negative true).
NIOD2
lIO bus input/output data bit 2 (negative true).
NlOD3
lIO bus input/output data bit 3 (negative true).
NlOD4
lIO bus input/output data bit 4 (negative true).
NlOD5
lIO bus input/output data bit 5 (negative true).
NlOD6
lIO bus input/output data bit 6 (negative true).
NlOD7
lIO bus input/output data bit 7 (negative true).
NlOD8
lIO bus input/output data bit 8 (negative true).
NlOD9
lIO bus input/output data bit 9 (negative true).
NlODI0
lIO bus input/output data bit 10 (negative true).
NlODll
lIO bus input/output data bit 11 (negative true).
NlOD12
lIO bus input/output data bit 12 (negative true).
NlOD13
lIO bus input/output data bit 13 (negative true).
NlOD14
lIO bus input/output data bit 14 (negative true).
NlOD15
lIO bus input/output data bit 15 (negative true).
NlOSB
lIO bus data transfer strobe (negative true).
NMYPA HP-lO card recognized its address has been asserted (negative true).
NNMl
Non-maskable interrupt (negative true).
NPAO
lIO bus peripheral address bit 0 (negative true).
NPAI
lIO bus peripheral address bit 1 (negative true).
NPA2
lIO bus peripheral address bit 2 (negative true).
NPA3
lIO bus peripheral address bit 3 (negative true).
NPFW Power fail warning (negative true).
NPOLL
lIO bus interface poll (negative true).
NSTS lIO bus status (negative true).
NSWO
Select code switch 0 (negative true).
NSWI
Select code switch 1 (negative true).
NSW2 Select code switch 2 (negative true).
NUAD Reserved.
NWAIT
lIO bus lengthen 10SB (negative true).
PA3
lIO bus peripheral address bit 3.
PPON
Primary power on; all outputs in spec.
READ
lIO bus data direction (positive true; high indicates data to lOP).
RESET Reserved.
SELO Reserved.
SGND Safety ground.
SYNC Synchronize.