
Table 
| I/O Address (Hex) | System Function (Shipping Configuration) | |
| 201 | 
 | Joystick (decoded in ESS1688) | 
| 202 | - 21F | Unused | 
| 220 | - 22F | Entertainment audio | 
| 230 | - 26D | Unused | 
| 26E - 26 | National 87334 "Super IO" controller in expansion | |
| 
 | 
 | base/convenience base | 
| 278 | - 27F | Unused | 
| 280 | - 2AB | Unused | 
| 2A0 - 2A7 | Expansion base/convenience base PC Card DMA | |
| 
 | 
 | selection, hard drive reset, IDE select, MultiBay | 
| 
 | 
 | device identification | 
| 2A8 - 2E7 | Unused | |
| 2E8 - 2EF | Reserved serial port | |
| 2F0 - 2F7 | Unused | |
| 2F8 - 2FF | Infrared port | |
| 300 | - 31F | Network interface in expansion base/convenience | 
| 
 | 
 | base (default; alternate is 320, 340, or 360h) | 
| 320 | - 36F | Unused | 
| 370 | - 377 | Secondary diskette controller (in expansion | 
| 
 | 
 | base/convenience base when a diskette drive is | 
| 
 | 
 | installed in the CPU) | 
| 378 | - 37F | Parallel port (LPT1/default) | 
| 380 | - 387 | Unused | 
| 388 | - 38B | FM synthesizer - OPL3 | 
| 38C - 3AF | Unused | |
| 3B0 - 3BB | VGA | |
| 3BC - 3BF | Reserved (parallel port/no EPP support) | |
| 3C0 - 3DF | VGA | |
| 3E0 - 3E1 | PC Card controller in CPU | |
| 3E2 - 3E3 | PC Card controller in expansion base/convenience | |
| 
 | 
 | base | 
| 3E8 - 3EF | Internal modem | |
| 3F0 - 3F7 | "A" diskette controller | |
| 3F8 - 3FF | Serial port (COM1/default) | |
| CF8 - CFB | PCI configuration index register  | |
| CFC - CFF | PCI configuration data register  | |
Specifications 
