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2 System Board
Devices on the ISA Bus
The headphones jack and the stereo-out (audio) jack can be used
interchangeably. The Windows 95 and Windows NT operating systems each
have integrated drivers (Directions III).
Flash EEPROM
The PC Workstation uses 256 KB of Flash EEPROM implemented using one
8-bit ROM chip. 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 in Chapters 4 and 5.
The Flash EEPROMs on the HP Kayak XA PC Workstation 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.
Microphone Input • 20 dB gain preamplifier. The boost can be muted with
software
• 16-level programmable volume control
• Input impedance: 600 ohms
• Sensitivity: 30 mVpp to 200 mVpp
Stereo Out Jack • Impedance: 32 ohms
Feature: Description: