System Board 4-13
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 Function
000A0000 - 000AFFFF Winfast 3D S320 II (TNT2-PRO)
000B0000 - 000BFFFF Winfast 3D S320 II (TNT2-PRO)
000C8000 - 000D7FFF Winfast 3D S320 II (TNT2-PRO)
08000000 - 09FFFFFF Intel® 82820 Processor to AGP Controller
08000000 - 09FFFFFF Winfast 3D S320 II (TNT2-PRO)
0A000000 - 0AFFFFFF Winfast 3D S320 II (TNT2-PRO)
0A000000 - 0B0FFFFF Intel® 82820 Processor to AGP Controller
0B000000 - 0B00FFFF Winfast 3D S320 II (TNT2-PRO)
F8000000 - FBFFFFFF Intel® 82820 Processor to I/O Controller
FF800000 - FFFFFFFF Motherboard Resources

I/O Addresses

The processor communicates with 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.

I/O Address Map

Address (Hex) I/O Device Name
0000-000F DMA controller 1
0020-0021 Programmable interrupt controller
0040-0043 System Timer
0060 Standard 101/102-key or MS Natural keyboard
0061 System speaker
0064 Standard 101/102-key or MS Natural keyboard
0070-0071 System CMOS/real time clock
0081-008F DMA controller
00A0-00A1 Programmable interrupt controller