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Appendix B. System address maps 49
0280–02E7 102 bytes Available
02E8–02EF 8 bytes Serial port 3 or 4
02F8–02FF 8 bytes COM2
0338–033F 8 bytes Serial port 3 or 4
0340–036F 48 bytes Available
0370–0371 2 bytes SIO planar Plug and Play index/data registers
0372–0375 4 bytes Available
0376–0377 2 bytes IDE channel 1 command
0378–037F 8 bytes LPT2
0380–03B3 52 bytes Available
03B4–03B7 4 bytes Video
03BA 1 byte Video
03BC–03BE 16 bytes LPT1
03C0–03CF 16 bytes Video
0334–03D7 4 bytes Video
03DA 1 byte Video
03D0–03DF 11 bytes Available
03E0–03E7 8 bytes Available
03E8–03EF 8 bytes COM3 or COM4
03F0–03F5 6 bytes Diskette channel 1
03F6 1 byte Primary IDE channel command port
03F7 (Write) 1 byte Diskette channel command
03F7, bit 7 1 bit Diskette disk change channel
03F7, bits 6:0 7 bits Primary IDE channel status port
03F8–03FF 8 bytes COM1
0400–047F 128 bytes Available
0480–048F 16 bytes DMA channel high page registers
0490–0CF7 1912 bytes Available
0CF8–0CFB 4 bytes PCI configuration address register
0CFC–0CFF 4 bytes PCI configuration date register
OPTn–400h 8 bytes ECP port, LPTn base address + hex 400
0CF9 1 byte Turbo and reset control register
0D00–FFFF 62207 bytes Available
Table 33. I/O address map
Address (hex) Size Description