HP 9020 - Page 231

Motherboard Pinout Data D-5
Signal
Definition
NICI I/O bus interface control bit 1 (negative true).
NIC2
I/O bus interface control bit 2 (negative true).
NIC3
I/O bus interface control bit 3 (negative true).
NIC4
I/O bus interface control bit 4 (negative true).
NIDO
110 cage door open (negative true). OR'd with NFDO.
NIFC
110 bus interface clear (negative true).
NIODO
110 bus input/output data bit 0 (negative true).
NIODI 110 bus input/output data bit 1 (negative true).
NIOD2 110 bus input/output data bit 2 (negative true).
NIOD3
110 bus input/output data bit 3 (negative true).
NIOD4
110 bus input/output data bit 4 (negative true).
NIOD5
I/O
bus input/output data bit 5 (negative true).
NIOD6
110 bus input/output data bit 6 (negative true).
NIOD7
I/O
bus input/output data bit 7 (negative true).
NIOD8 110 bus input/output data bit 8 (negative true).
NIOD9
110 bus input/output data bit 9 (negative true).
NIODI0
I/O bus input/output data bit 10 (negative true).
NIODll I/O bus input/output data bit 11 (negative true).
NIOD12
110 bus input/output data bit 12 (negative true).
NIOD13
110 bus input/output data bit 13 (negative true).
NIOD14
I/O
bus input/output data bit 14 (negative true).
NIOD15
I/O
bus input/output data bit 15 (negative true).
NIOSB
I/O
bus data transfer strobe (negative true).
NMI Non-maskable interrupt.
NPAO I/O bus peripheral address bit 0 (negative true).
NPAI I/O bus peripheral address bit 1 (negative true).
NPA2
I/O
bus peripheral address bit 2 (negative true).
NPFW
Power
fail warning (negative true).
NPI Not pop in (negative true). Resets the stack.
NPKPWR
Shut down command indicator due to peak power (negative true).
NPOLL
I/O
bus interface poll (negative true).
NPSTLED
Power
supply overtemperature (negative true).
NPV Not power valid; all outputs in spec (negative true).
NSELFTEST
Leading
edge causes power supply to send stack into self-test via NSYSPU and NPI
(negative true). Originates on keyboard.
NSTLED Stack overtemperature (negative true).
NSTS
I/O
bus status (negative true). Driven by keyboard.
NSYSPU Not system pop unsynchronized (negative true). Used with NPI to cause stack to
perform a self-test.
NWAIT
110 bus lengthen IOSB (negative true).
PFLG Printer's flag line; driven by keyboard.
PPON
Primary power on; all outputs in spec.
PSDGND Power supply ground for 25 KHz and fan circuitry.
PST
Power supply temperature indicator; connected to FANCTL.
PSTS Printer's status line.
PWMEN
Pulse
width modulator enable.
READ
110 bus data direction (positive true; high indicates data to lOP).