Chapter 2
63
System Board
Devices on the ISA Bus
The headphones jack and the stereo-out (audio) jack can be used interchangeably.
Flash EEPROM
The PC Workstation uses 512 KB of Flash EEPROM implemented using two 8-bit ROM
chips. Flash EEPROM is ROM in which the whole memory can be returned to its
unprogrammed state by the application of appropriate electrical signals to its pins. It can
then be reprogrammed with the latest upgrade firmware.
The System ROM contains the LAN boot firmware and the system BIOS (including the
boot code, the ISA and PCI initialization, the Setup program and the Power-On Self-Test
routines, video BIOS, plus their error messages). These are summarized the chapter “HP
BIOS” and the chapter “Tests and Error Messages.”
The Flash EEPROMs on HP V
ISUALIZE
Personal Workstations implement a bootblock
feature which allows recovery from a failed attempt at updating the System BIOS. The
bootblock contains the minimum system BIOS information necessary to reprogram the
Flash EEPROM.
Updating the system ROM
The System ROM can be updated with the latest BIOS firmware. This can be downloaded
from HP’s World Wide Web site:
http://www.hp.com/go/visualizesupport
To download a BIOS upgrade, connect to the HP Web site and follow the on-screen
instructions to download the flash utility programs.
Before updating the System ROM, it is necessary to disable the “PSWRD” switch on the
system switches (SW-7), and to type in the System Administrator’s Password when
starting up the computer. The PCI and PnP information is erased in the process.
Do not switch off the computer until the system BIOS update procedure has completed,
successfully or not, otherwise irrecoverable damage to the ROM may be caused. While
updating the flash ROM, the power supply switch and the reset button are disabled to
prevent accidental interruption of the flash programming process.
Audio Front Panel
• Microphone input jack
• Stereo output jack
Microphone Input
• 20 dB gain preamplifier. The boost can be muted with
software
• 32-level programmable volume control
• Input impedance: 600 W
• Sensitivity: 30 mVpp to 283 mVpp
Stereo Out Jack
• Impedance: 32 W
Table 2-11. Audio Chip Specifications
Feature
Description
Содержание X Class 500/550MHz
Страница 6: ...6 Contents ...
Страница 8: ...8 Figures ...
Страница 15: ...15 1 System Overview ...
Страница 66: ...66 Chapter2 System Board Devices on the ISA Bus ...
Страница 96: ...96 Chapter3 Interface Boards and Mass Storage Drivers Connectors and Sockets ...
Страница 134: ...134 Chapter5 Tests and Error Messages Beep Codes ...
Страница 135: ...135 A Regulatory Information and Warranty ...
Страница 146: ...146 AppendixA Regulatory Information and Warranty HP Hardware Warranty ...