Little Ben - HP Vectra VE5 3 Series Technical Reference Manual

General Purpose I/O

Little Ben

Little Ben is an HP application specific integrated circuit (ASIC), designed
to be a companion to the Super I/O chip. It connects between the chip-set
and the processor. It contains the following:
• BIOS timer
hardware wired 50 ms long 880 Hz beep module.
automatic blinker that feeds the LEDs module with a 1 Hz oscillator
signal.
• security protection (access, flash and anti-virus protection)
For 128, 256 or 512 KB Flash EEPROMs.
For the Ultra I/O space: the Serial EEPROM, serial ports, parallel port
and mass storage drives (disable write on Flexible Disk Drive, disable
boot on any drive, disable use of any embedded drive)
• hard and soft control for the power supply
• Advanced power management (APM) version 1.1
• glue logic (such as programmable chip selects)
Little Ben can be powered by battery, so its consumption has been kept as
low as possible. When VccState and PowerGood pins are both low, all output
pins are in tri-state mode, except for RemoteOnBen which continues to be
driven. This allows the computer to be restarted even after a power loss has
occurred.
When the user requests a ShutDown from the operating system, the
environment is first cleared. Any request to turn off the computer, from the
status panel, or from the operating system, can only be granted if the
computer is not locked by Little Ben's lock bit (otherwise the power remains
on, a red light is illuminated, and the buzzer is sounded).
Enable remote ON
This signal is used to control a status panel light on HP Vectra 500
Jumper J15. (GPIO2=0 if the jumper is removed, to clear the product ID field)
Screen blanking enabled (GPIO3=0)
Not used. (Depends on an unused setting of jumper J15).
Description
2 System Board
Devices on the ISA Bus
GPIO number
GPIO0
GPIO1
GPIO2
GPIO3
VPP_ON2
25