X-Hacker.org- Programmers Reference 0.02b - <b>020h - 021h interupt controller 8259</b>

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020h - 021h       Interupt controller 8259

        20h     Command register

        21h     IRQ-Register

              Bit 7 6 5 4 3 2 1 0
                x . . . . . . .  IRQ-7 LPT 1
                . x . . . . . .  IRQ-6 Diskette
                . . x . . . . .  IRQ-5 Fixed Disk (XT)/LPT 2 (AT)
                . . . x . . . .  IRQ-4 COM 1
                . . . . x . . .  IRQ-3 COM 2
                . . . . . x . .  IRQ-2 Misc.
                . . . . . . x .  IRQ-1 Keyboard
                . . . . . . . x  IRQ-0 System Timer

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