BC 4000
Appendix C - Interrupt and DMA Channels

Table of Contents

Interrupt Channels
DMA Channels

Interrupt Channels

Interrupt Level         Use

        NMI                     Parity/VGA

         0                              Timer
         1                              Keyboard
         2                              Cascaded Input for
         PIC 2
         3                              COM 2
         4                              COM 1
         5                              Not Used
         6                              Floppy
         7                              LPT 1
         8                              Real Time Clock
         9                              Not Used, redirected
         to IRQ2
        10                              May be used by AC
        Power Fail from Power Supply JP1
        11                              Not Used
        12                              May be used by PS/2
        Mouse, JP5
        13                              Numeric Co-Processor
        14                              IDE Hard Drive
        15                              May be used by AC
        Power Fail from Power Supply JP1

DMA Channels

The only DMA channel used by the BC 4000 board is channel 2 for the floppy disk controller. This controller cannot be disabled.

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