HP Net Vectra Technical Reference Manual page 22

RTC
Serial EEPROM
ACPI Support
General Purpose I/O
2 System Board
Chip-Set
The real-time clock (RTC) is 146818A-compatible. With an accuracy of
20 ppm (parts per million). The configuration RAM is implemented as 256
bytes of CMOS memory.
This is the non-volatile memory which holds the values for the Setup
program (they are no longer stored in the CMOS memory).
The Advanced Configuration and Power Interface (ACPI) provides a
system-wide approach to system and device power management that allows
the PC to be turned off, and yet remain sufficiently active to respond
immediately to user and network requests.
There are several general purpose I/O pins. Some of these are used on the
HP Net Vectra to sense the current settings of system board switches (as
described on page 24 and page 31).
Cache-sleep
Screen blank
Error light
MA12
MA13
not connected
Low power mode
Clear product ID (connected to SW-10, open=1, closed=0)
USB fuse
IOCHK#
Thermal input (OVERTEMP)
Fan control (not used)
Remote wake up (RWO)
Keyboard and mouse lock (keyboard OR mouse IRQ)
Pause light
Remote power on (RPO)
Start key (connected to SW-9, open=1, closed=0)
22
Description GPIO number
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
GPIO8
GPIO9
GPIO10
GPIO11
GPIO12
GPIO13
GPIO14
GPIO15
GPIO16