Ralf Christian Strandell wrote:
>
> I would like to use both the serial port com2
> at the rear of my computer and a modem. My mouse
> is on cua0/com1.
>
> Now I have configured the modem to irq 3 (2F8),
> and _disabled_ com2 from cmos setup. (as otherwise
> com2 is using addr. 2F8 and the modem doesn't work)
>
> /dev/modem points to cua1. Com2 has however been
> disabled. Still the modem works... Why? Does this
> have something to do with the fact that com2 is always
> at 2F8?
>
> Where's my com2 port really? On the modem? If com2 is now
> the modem, then how do I use the original com2 connector
> at the rear panel of my PC?
>
> I feel slightly confused...
>
Serial port com2 and com4 use the same interrupt (irq2).
Serial ports com1 and 3 use irq 4. This means that you cannot
use com1 and com3 at the same time (or com 3 and com 4).
I suggest that you put your modem on com 4 so that you can use
your mouse and modem at the same time.
You must be using an internal modem. It will be possible
to set it to com 4. On my modem there are jumper settings to do
this. You might have to disable PnP, also by jumper settings.
Com2 refers to a hardware which uses irg3 and port 0x2F8. If you
have cards using this port and irq simultaniously then then the
PC is likely to misbehave. Maybe freeze, or maybe the keyboard will
lock.
>
> PS. Can I have two pysical monitors in use
> if I have two different graphics cards?
>
You can use a colour card and a monochrome card. You cannot use two
colour
cards.
