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8170 N/B MAINTENANCE
@ DMA
---ECP/FIR also use DMA but they are programmable
@ PIC
---IRQ0 is used by the system timer
---IRQ1 is used by KBC (Key Board Controller)
---IRQ2 is used by slave PIC
---IRQ3 is used by IR
---IRQ5 is used by Audio
---IRQ7 is used by LPT port
---IRQ8 is used by RTC (Real Time Clock)
---IRQ9 is shared by SCI
---IRQ10 is used by LAN
---IRQ10 is used by PCMCIA
---IRQ10 is used by IEEE 1394
---IRQ10 is also shared by VGA
---IRQ12 is used by mouse
---IRQ13 is used internally by CPU to recognize FPU interrupts
---IRQ14 is used by IDE channel 1
---IRQ15 is used by IDE channel 2
---Preserve two IRQs (4, 6, 11) for other devices to use.