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Prb with COM ports

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  • 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).]
    Georges MM13

  • #2
    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.

    There are no atheists in a fox hole or the morning of a math test.
    If my flag offends you, I'll help you pack.


    • #3
      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