Quick Link II Fax  (250-3027B)    DOS IRQ Settings     Faxback Doc. # 3243

Since various add in cards like scanners, bus mice, network cards, and
sound boards use IRQ's (interrupts), it is possible that the default IRQ
settings for your modem will not work.  If you suspect there is an IRQ
conflict, Quick Link II Fax can work around the problem if you do the
following:

1.  Change the IRQ jumper or DIP switch on the modem itself (your modem
    manual will show you how, if possible).

2.  If using the DOS version of Quick Link II Fax, go into modem SETUP,
    click OPTION, and manually reset the IRQ of Quick Link II Fax to what
    you set it for on your fax/modem.  If using Windows, refer to the next
    page covering Windows and IRQ's.

As an example, suppose that your modem in COM2 (which normally uses IRQ3)
cannot function because IRQ3 is used by your scanner card, and that IRQ 5
is available.  Open your PC and set the appropriate jumpers to COM2,
IRQ 5.  Run Quick Link II Fax, get into the MODEM SETUP dialog box, and
set the on screen COM port setting to COM 2, IRQ 5.

Standard COM port settings

    PORT    IRQ    Address

    COM1    4      3F8

    COM2    3      2F8

    COM3    4      3E8

    COM4    3      2E8

Common IRQ Usage

The following IRQ table holds true for most PC AT/386-486 computers:

    IRQ    USE

    0      Timer Interrupt

    1      Keyboard Interrupt

    2      Programmable Interrupt Controller Cascade (to IRQ 9)

    3      COM2 and COM4

    4      Com1 and COM3

    5      LPT2 (Parallel Printer PORT 2 - Probably Open)

    6      Floppy Disk

    7      LPT1 (Parallel Printer Port 1)

    8      Real Time Clock

    9      Cascade to IRQ 2

    10     Reserved for future expansion (Open)

    11     Reserved for future expansion (Open)

    12     Reserved for future expansion (Open)

           Mouse Port on PS/2 - PS/2 mouse interface

    13     80 x 87 Math Coprocessor (486DX chip)

    14     Hard Disk

    15     Reserved for future expansion (Open)

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