Interface pinouts and interrupts
Interrupt Request Levels and DMA channels
Interrupt Request Levels and DMA channels are listed below.
Interrupt Request Levels
IRQ0 = timer 0
IRQ1 = keyboard
IRQ2 = interrupt cascading
IRQ3 = serial interface 2 (COM2/COM4)
IRQ4 = serial interface 1 (COM1/COM3)
IRQ5 = free or parallel interface (LPT2)
IRQ6 = floppy disk controller
IRQ7 = parallel interface (LPT1/LPT3)
IRQ8 = real-time clock interrupt
IRQ9 = free or VGA controller
IRQ10 = free
IRQ11 = free
IRQ12 = mouse
IRQ13 = math coprocessor
IRQ14 = IDE disk controller (connector 1)
IRQ15 = IDE disk controller (connector 2)
DMA channels
DMA0 = free
DMA1 = free
DMA2 = floppy disk controller
DMA3 = free/ECP mode
DMA4 = DMA channel cascading
DMA5 = free
DMA6 = free
DMA7 = free
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