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Prb with COM ports

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  • Tom Hanlin
    Drivers may not be needed but, the PC was only designed for a maximum
    of four serial ports. The comm support built into PowerBASIC will let
    you specify IRQs and shows how to modify the internal port addresses
    for those four ports. I don't think there is any chance of using more
    than four ports at a time with OPEN "COMx".

    You might check out some of the comm libraries available here:

    There used to be FOSSIL drivers available for all kinds of machine
    configurations. It might be worth looking into.

    It seems like the manufacturer of the comm board ought to be able
    to offer some suggestions.

    Tom Hanlin, PowerBASIC Staff
    Opinions expressed may not be those of my employer or myself

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  • Mel Bishop
    First, I would check with the manufacturer to see if the card
    is supported by a DOS program.

    Assuming it is, make sure any drivers supplied are installed

    Check any hardware/software jumpers and make sure your program
    is trying to access the correct port with the correct IRQ.

    Just a couple of thoughts.


    Leave a comment:

  • Georges GUILBERT
    started a topic Prb with COM ports

    Prb with COM ports

    Under Dos 6 & PB35
    With a nova 300 board + PC 104 multiport board
    --> 8 COM ports

    I've just add the multiport board and I can't address
    the COM 5,6,7 & 8

    1. Is it possible
    2. How to ?

    Thanks a lot, i'm desperate

    Code I use :
    OPEN "COM4: 9600,N,8,1,IR3,CS0,DS0,CD0,RS" For Random as #2
    Code that create a "ERROR 53: File not found" :
    OPEN "COM5: 9600,N,8,1,IR3,CS0,DS0,CD0,RS" For Random as #2
    OPEN "COM5: 9600,N,8,1,IR7,CS0,DS0,CD0,RS" For Random as #4

    Georges MM13

    [This message has been edited by Georges GUILBERT (edited November 04, 2004).]