NEC POWERMATE ES Series, Service And Reference Manual

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4-12 System Boards
MPEG is a compression/decompression standard developed by a professional video group called
the Motion Picture Experts Group. MPEG produces full-screen, 30-frames-per-second (fps),
broadcast-quality digital video.
Integrated Audio
To support multimedia applications, an AC97 Codec audio chip is integrated on the system
board. The chip provides 16-bit stereo, Sound Blaster Pro

-compatible audio.
The sound system provides all the digital and analog mixing functions required for playing and
recording audio on personal computers. Features include 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 all mixer and volume control
functions.
System Board Resources
The system memory map, I/O addresses, and DMA settings are given in the following sections.
System interrupt settings, parallel interrupt settings, and serial interrupt settings are included in
Section 2, “System Configuration.”
Memory Map
The system memory map is shown in the following table.
System Memory Map
Memory Space Size Function
100000-18000000 383 MB Extended memory
FC000-FFFFF 16 KB Boot block
FA000-FBFFF 8 KB ESCD (Plug and Play Configuration and DMI)
F9000-F9FFF 4 KB Reserved for BIOS
F8000-F8FFF 4 KB OEM logo or Scan User Flash
E8000-E7FFF 64 KB POST BIOS
E0000-E7FFF 32 KB POST BIOS (currently available as UMB)
C8000-D7FFF 96 KB Available HI DOS memory (open to ISA and PCI bus)
A0000-C7FFF 160 KB Video memory and BIOS
9FC00-9FFFF 1 KB Extended BIOS data (movable by memory manager software)
80000-9FBFF 127 KB Extended conventional memory
00000-7FFFF 512 KB Conventional memory
I/O Addresses
The processor communicates with I/O devices by I/O mapping. The hexadecimal (hex)
addresses of I/O devices are listed in the following table.
Note
In Plug and Play systems, these addresses are typical but may vary by configuration.