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Can I change IRQ of COM3 and COM4 ?

2007-10-22 Application Document No.1-0000381

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Solution:

  • Can I change IRQ of COM3 and COM4 ?

    The definition of the IRQ and Address for COM ports are fixed on PCM-5862.
    COM1 3F8-3FF IRQ4
    COM2 2F8-2FF IRQ3
    COM3 3E8-3EF IRQ10
    COM4 2E8-2EF IRQ5

    The CMOS configuration provides a phycal swap function for two pares:
    Port 1,2 swap COM1,2 and Port 3,4 swap COM 3,4.
    As you swap ports, the IRQ follows is address. For example if I swap COM3 and
    COM4 then my configuration becomes:
    Port 4 = COM3 3E8-3EF IRQ10
    Port 3 = COM4 2E8-2EF IRQ5


    *** If you need to swap the IRQ definition only of COM3 and COM4 (Address
    remain unchanged), Please swap hardware jumper of J8 and J9. Now this jumper
    is only with 2 pins so rework these two jumper is necessary. After your
    change J8 to 2-3 and J8 to 1-2, your hard ware configuration will be:

    COM1 3F8-3FF IRQ4
    COM2 2F8-2FF IRQ3
    COM3 3E8-3EF IRQ5
    COM4 2E8-2EF IRQ10
    But note that CMOS will still show that 3E8 is still IRQ10 and 2E8 is still IRQ
    5. In fact the IRQ is already swaped.

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