HP Vectra XA 5/xxx HP Vectra xA 5/XXX Series 5 /vl 5/xxx series 5 pc Technical - Page 37

Devices on the ISA Bus

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2 System Board Devices on the ISA Bus Devices on the ISA Bus ISA Device Super I/O Little Ben (HP ASIC) Index Data 15Ch 15Dh 496h 497h Super I/O Controller The Super I/O chip (37C932) is part of the chip set, and is described on page 26. The computer is supplied with a Logitech 2-button mouse, and a C3758A keyboard with the following features: Ì Space bar power on, to start the computer from the Off state (if power on from keyboard is enabled in the Setup program). Ì Windows key (next to the keys), which has the same effect as clicking the "Start" button on the Windows 95 task bar. Ì Pull-down key (next to the right key), which has the same effect as clicking the right mouse button. Serial EEPROM The computer uses 4 Kbit of Serial EEPROM implemented within a single 512 K ! 8-bit ROM chip. Serial EEPROM is ROM in which one byte at a time can be returned to its unprogrammed state by the application of appropriate electrical signals. In effect, it can be made to behave like very slow, nonvolatile RAM. It is used for storing the contents of the CMOS memory (the tatoo string, the serial number, and the parameter settings for the Setup program), even during long periods of the computer being unplugged from the mains supply. When installing a new system board, the Serial EEPROM will have a blank serial number field. This will be detected automatically by the BIOS, which will then prompt the user to enter the serial number which is printed on the identification label on the back of the computer. 37

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37
2
System Board
Devices on the ISA Bus
Devices on the ISA Bus
Super I/O Controller
The
Super I/O
chip (37C932) is part of the chip set, and is described on
page 26.
The computer is supplied with a Logitech 2-button mouse, and a C3758A
keyboard with the following features:
Space bar power on, to start the computer from the
Off
state (if
power on
from keyboard
is enabled in the
Setup
program).
Windows key (next to the
keys), which has the same effect as
clicking the “Start” button on the Windows 95 task bar.
Pull-down key (next to the right
key), which has the same effect as
clicking the right mouse button.
Serial EEPROM
The computer uses 4 Kbit of Serial EEPROM implemented within a single
512 K
8-bit ROM chip. Serial EEPROM is ROM in which one byte at a time
can be returned to its unprogrammed state by the application of appropriate
electrical signals. In effect, it can be made to behave like very slow, non-
volatile RAM. It is used for storing the contents of the CMOS memory (the
tatoo string, the serial number, and the parameter settings for the
Setup
program), even during long periods of the computer being unplugged from
the mains supply.
When installing a new system board, the Serial EEPROM will have a blank
serial number field. This will be detected automatically by the BIOS, which
will then prompt the user to enter the serial number which is printed on the
identification label on the back of the computer.
ISA Device
Index
Data
Super I/O
15Ch
15Dh
Little Ben (HP ASIC)
496h
497h