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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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