UPGRADING REPAIRING PCs

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Chapter 2—System Components and Configuration
Table 2.23 Bus-Based Device Port Addresses Continued
Address (Hex) Size Description
0340–034F 16 bytes SMC Ethernet adapter (alternate)
0360–036F 16 bytes SMC Ethernet adapter (alternate)
0366 1 byte Fourth IDE command port
0367, bits 6:0 7 bits Fourth IDE status port
0370–0375 6 bytes Secondary floppy controller
0376 1 byte Secondary IDE command port
0377, bit 7 1 bit Secondary floppy controller disk change
0377, bits 6:0 7 bits Secondary IDE status port
0378–037F 8 bytes Parallel Port 1 (LPT1)
0380–038F 16 bytes SMC Ethernet adapter (alternate)
0388–038B 4 bytes Audio - FM synthesizer
03B0–03BB 12 bytes Video, Mono/EGA/VGA standard ports
03BC–03BF 4 bytes Parallel Port 1 (LPT1) in some systems
03BC–03BF 4 bytes Parallel Port 3 (LPT3)
03C0–03CF 16 bytes Video, EGA/VGA standard ports
03D0–03DF 16 bytes Video, CGA/EGA/VGA standard ports
03E6 1 byte Third IDE command port
03E7, bits 6:0 7 bits Third IDE status port
03E8–03EF 8 bytes Serial Port 3 (COM 3)
03F0–03F5 6 bytes Primary floppy controller
03F6 1 byte Primary IDE command port
03F7, bit 7 1 bit Primary floppy controller disk change
03F7, bits 6:0 7 bits Primary IDE status port
03F8–03FF 8 bytes Serial Port 1 (COM 1)
04D0–04D1 2 bytes Edge/level triggered PCI interrupt controller
0530–0537 8 bytes Windows sound system (default)
0604–060B 8 bytes Windows sound system (alternate)
0678–067F 8 bytes LPT2 in ECP mode
0778–077F 8 bytes LPT1 in ECP mode
0A20–0A23 4 bytes IBM Token-Ring adapter (default)
0A24–0A27 4 bytes IBM Token-Ring adapter (alternate)
0CF8–0CFB 4 bytes PCI configuration address registers
0CF9 1 byte Turbo and reset control register
0CFC–0CFF 4 bytes PCI configuration data registers
FF00–FF07 8 bytes IDE bus master registers
FF80–FF9F 32 bytes Universal Serial Bus (USB)
FFA0–FFA7 8 bytes Primary bus master IDE registers
FFA8–FFAF 8 bytes Secondary bus master IDE registers