User`s manual

SBC81203 LGA775 SBC User’s Manual
Hardware Description
24
4.4 I/O Port Address Map
The Intel
®
Core
TM
2 Duo, Pentium
®
D, Pentium
®
4 and Celeron
®
D
CPUs can communicate via I/O ports. There are total 1KB port
addresses available for assignment to other devices via I/O expansion
cards.
Address Devices
000-01F DMA controller #1
020-03F Interrupt controller #1
040-05F Timer
060-06F Keyboard controller
070-07F Real time clock, NMI
080-09F DMA page register
0A0-0BF Interrupt controller #2
0F0 Clear math coprocessor busy signal
0C0-0DF DMA controller #2
0F1 Reset math coprocessor
0F8-0FF Math processor
120 Disable watchdog timer operation (read)
121 Enable watchdog timer operation (read)
122 Watchdog
1F0-1F8 Fixed disk controller
200-207 Game port
300-31F Prototype card
360-36F Reserved
378-37F Parallel port #1
3B0-3BF MDA video card (including LPT1)
3C0-3CF EGA card
3D0-3DF CGA card
3F0-3F7 Floppy disk controller
3F8-3FF Serial port #1 (COM1)
2F8-2FF Serial port #2 (COM2)