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2 System Board
Devices on the ISA Bus
Audio Controller
Audio Chip The HP Kayak XU PC Workstation has an audio chip (AD1816) integrated
on the system board. It is driven from the ISA bus, and has the following
specification:
❒ 8-bit and 16-bit stereo sampling from 4 kHz to 55.2 kHz.
❒ Support for Hardware and Software Wave-table synthesizer.
❒ 5 inputs (1 mono input (microphone), 1 mic-in, 1 stereo line-in, 1 CD-ROM
and one auxiliary audio input).
❒ 3 outputs (1 internal speaker, 1 headphone jack and 1 stereo line-out).
❒ Connector for MIDI /single joystick interface (MPU-401 UART
compatible).
❒ Microphone input (600 ohms, 20dB gain preamplifier, 30 mV to 200 mV
peak-to-peak).
❒ Line-out (stereo) jack has 32 ohm impedance.
❒ Headphone jack can supply 5 mW per channel with headphone speakers.
The headphone jack and the stereo-out (audio) jack can be used
interchangeably.
Audio Drivers The Windows 95 and Windows NT operating systems each have integrated
drivers (DirectSound III). The DOS and Windows 3.x operating systems
require the installation of ADi drivers.
Flash EEPROM
The PC Workstation uses 512 KB of Flash EEPROM implemented using two
256 K ✕ 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 SCSISelect
program, the Setup program and the Power-On Self-Test routines, plus their
error messages). These are summarized in Chapters 4 and 5.
The Flash EEPROMs on the HP Kayak XU 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.
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