Specifications
System interrupt specifications
Hardware IRQ | System function |
|
|
IRQ0 | System timer |
|
|
IRQ1 | Standard |
|
|
IRQ2 | Cascaded |
|
|
IRQ4 | COM1 |
|
|
IRQ6 | Diskette drive |
|
|
IRQ7* | Parallel port |
|
|
IRQ8 | System |
|
|
IRQ9* | Microsoft |
|
|
IRQ12 | Synaptics PS/2 TouchPad |
|
|
IRQ13 | Numeric data processor |
|
|
IRQ14 | Primary IDE channel |
|
|
IRQ15 | Secondary IDE channel |
*Default configuration; audio possible configurations are IRQ5, IRQ7, IRQ9, IRQ10, or none.
✎PC Cards may assert IRQ3, IRQ4, IRQ5, IRQ7, IRQ9, IRQ10, IRQ11, or IRQ15. Either the infrared or the serial port may assert IRQ3 or IRQ4.
System I/O address specifications
I/O address (hex) | System function (shipping configuration) | |
|
| |
000 - 00F | DMA controller no. 1 | |
|
|
|
010 | - 01F | Unused |
|
| |
020 - 021 | Interrupt controller no. 1 | |
|
|
|
022 | - 024 | Opti chipset configuration registers |
|
|
|
025 | - 03F | Unused |
|
| |
02E - 02F | 87334 “Super I/O” configuration for CPU | |
|
| |
040 - 05F | Counter/timer registers | |
|
|
|
044 | - 05F | Unused |
|
|
|
060 |
| Keyboard controller |
|
|
|
061 |
| Port B |
|
| |
062 - 063 | Unused | |
|
|
|
064 |
| Keyboard controller |
|
|
|
065 | - 06F | Unused |
|
| |
070 - 071 | NMI enable/RTC | |
|
|
|
072 | - 07F | Unused |
|
| |
080 - 08F | DMA page registers | |
|
| |
090 - 091 | Unused | |
(Continued)
Maintenance and Service Guide |
