non plug and play device on com port?

Discussion in 'A+ Certification' started by David K, Jul 17, 2003.

  1. David K

    David K Guest


    Charles Brooks' A+ book says the following in chapter 8:

    "To install a non PnP device on a specific COM port (that is, COM2),
    you must first disable that port in the system's CMOS settings in
    order to avoid a device conflict. If not, the system might try to
    allocate that resource to some other device because it has no way of
    knwing that the non PnP device requires it."

    If the BIOS won't know to automatically allocate resources to a device
    unless it's PnP, how does the device ever get recognized? I don't
    understand why disabling a comport is gonna help you get the system to
    allocate resources to a non-PnP device. And are we talking about the
    BIOS or the OS?

    Is he implying that I should disable the port in the CMOS, plug in the
    device, install the Windows drivers, then re-enable the port in CMOS?
    If so, why would that help?

    David K, Jul 17, 2003
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  2. David K

    Geoff Guest

    never heard so much rubbish....
    the only thing i can think of it is that it means if you wanted it install
    another device useing the same resources as com2 (an ISA internal modem
    where disabling the com port in the bios settings would be the way to go

    it's just badly worded i think
    also, some older bios's don't properly disable com ports, all the do is
    don't allocate resourses to it, which would work in the days before pnp os's
    for example, i disable a com port, bios doesn't give it resources, windows
    loads of see's a pnp device with no resources and does something about it
    Geoff, Jul 18, 2003
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