NEC POWERMATE 8100 Series, Service And Reference Manual

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System Board 4-21
The sound system is standard and has the following features:
„
Crystal CS4235 chip integrated on system board
„
digital audio and analog mixing functions, including stereo analog-to-
digital and digital-to-analog converters, analog mixing, anti-aliasing and
reconstruction filters, line and microphone level inputs, digital audio
compression, and full digital control of mixer and volume control
functions
„
Adlib
™
, Sound Blaster Pro 2.0, Windows Sound System, and MPU-401
compatibility.
The Crystal audio chip includes a full Plug and Play interface. Each logical
device is configured into the host environment using the Plug and Play
configuration methodologies. The audio subsystem requires two DMA channels
and one interrupt.
Pin Assignments
The following paragraphs list the pin assignments for the various connectors on
the system board.
Keyboard and Mouse Connectors
The keyboard and mouse are PS/2-style connectors and can be plugged into
either connector on the system board. The system unit detects their presence at
power on. Pin assignments are given in the following table.
Keyboard and Mouse Pin Assignments
Pin Signal Name
1 Data
2 No connection
3 Ground
4 +5 V (fused)
5 Clock
6 No connection