Installed a single RS232 serial port PCI card in a Windows XP SP1 system.
Sometimes it works. Sometimes it doesn't install at boot.
It comes up as COM5 when it works.
There is a soft modem on the main board that comes up COM4.
The main board RS232 port comes up COM1.
So, all COM ports seem to be accounted for.
Previous experiences with this computer and its peripherals:
There is a weather station connected / powered via USB. Just to provide for sure power, I installed a PCI / USB card. That seems to work OK - and did initially.
There is a Foruno GPS that connects via the needed RS232 serial port. There seem to be at least two wiring arrangements that work - but I suspect this is all OK.
Had been using the main board RS232 serial port but this causes the following trouble:
With the Foruno turned off, everything works fine.
With the Foruno turned on, the mouse only goes in the bottom quarter of the screen. Anything higher and it hops to the bottom. It appears that there's confusion over serial port inputs and the mouse. It doesn't matter if the mouse is PS/2 witj adapter or USB (same mouse).
At one point, when the mouse was USB, I saw a brief message that the computer had found a "serial mouse"????
Only saw this once.
I did try to install another serial port board but I assume that I was not able to find the correct driver for it. Nothing I tried seemed to work. These are NetMOS-based cards.
Oh yes, I also tried to install a USB / Serial adapter cable but it would NOT install properly - not once, not ever. I have the driver disk that came with it so it *should* work.
All this is very strange and I need to get it fixed.