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IRQ Iinterrupt Requests

Helps the processor switch between multiple tasks sharing its time

Typical IRQ Settings

0 System Timer
1 Keyboard
2 Cascade to IRQ 9
3 Com2, Com4
4 Com1, Com3
5 Normally sound card or LPT2
6 Floppy Disk Controller
7 Parallel Port (LPT1)
8 Clock
9 Cascaded IRQ2
10 Available
11 Available
12 PS/2 Mouse
13 Coprocessor
14 Hard Disk Controller (HDC)
15 Available

DMA Direct Memory Access

Typical DMA channels

0 8 bits
1 8 bits
2 8 bits Floppy Disk
3 8 bits
4 16 bits DMA controller
5 16 bits
6 16 bits