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"Compaq.com - Compaq Presario Series Maintenance and Service Guide - Models : 1270, 1670, and 1675
IRQ3 Compaq Prosignia 56K-DF
IRQ4 Communications Port (COM1)
IRQ5 ES1869 Plug and Play Audio Drive
IRQ6 Standard Floppy Disk Controller
IRQ7 Printer Port (LPT1)
IRQ8 System CMOS / real-time clock
IRQ9 (free)
IRQ10 OPTi 82C861 PCI to USB Open Host Controller
IRQ10 IRQ Holder for PCI Steering
IRQ11 IRQ Holder for PCI Steering
IRQ11 IRQ Holder for PCI Steering
IRQ11 NeoMagic MagicGraph 128XD
IRQ11 Texas Instruments PCI-1131 CardBus Controller
IRQ11 Texas Instruments PCI-1131 CardBus Controller
IRQ12 Synaptics PS/2 TouchPad
IRQ13 Numeric data processor
IRQ14 Primary IDE controller (dual fifo)
IRQ14 Opti Viper Max Dual PCI IDE Controller
IRQ15 Secondary IDE controller (dual fifo)
IRQ15 Opti Viper Max Dual PCI IDE Controller
System DMA
System DMA
Hardware DMA System Function
0
ES1869 Plug and Play AudioDrive
1
ES1869 Plug and Play AudioDrive
2
Standard Floppy Disk Controller
3
(free)
4
Direct memory access controller
5
(free)
6
(free)
7
(free)
System I/O Address
System I/O Address
I/O Address (Hex) System Function (Shipping Configuration)
x0000 - x000F Direct memory access controller
x0020 - x0021 Programmable interrupt controller
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