48Appendix B. I/O Address MapB.1 System I/O Address MapI/O Address Map Description000-00F DMA controller #1020-021 Interrupt controller # 1, master022-023 Chipset address040-043 System timer060-060 Standard 101/102 keyboard controller061-061 System speaker064-064 Standard 101/102 keyboard controller070-07F Real time clock, NMI controller080-0BF DMA page register0A0-0BF Interrupt Controller # 20C0-0DF DMA Controller # 20F0-0F0 Clear math coprocessor busy0F1-0F1 Reset math coprocessor0F8-OFF Math coprocessor1F0-1F7 BUS master PCI IDE controller278-27F Reserved2F8-2FF Serial Port 2378-37F Parallel Printer Port 13B0-3DF Cyrix Graphic Adapter3F0-3F7 Floppy Disk Controller3F8-3FF Serial Port 1443 Watch dog timer enable043/843 Watch dog timer disable
