This is concerning my inability to connect through either of the 2 X COM PORT Daughterboard ports on a mini-ITX system I recently purchased. I am running XP service pack 3. The motherboard is a Jetway J7F2WE-2G with 1 GB memory.

Here is info that may be of help. COM1, the original I believe, works fine. I attached a gps to all ports and only COM1 was RECEIVING NMEA data from the gps. The mapping software has the ability to show the raw input from the gps. I deselected FIFO buffers on COM2 but no change. I hooked up a modem to COM 1 and it works fine but will not work with COM2.

I checked the BIOS and got the following addresses and IRQ:

Serial 1 3F8 IRQ4
Serial 2 2F8 IRQ3
Parallel 378 IRQ7

I USED MSD.EXE and got the following info:

IRQAddressDesc.Detected
30396:0054COM2, COM4COM2, COM4
40396:006ECOM1, COM3COM1, COM3
50396:0088LPT2LPT2
7020C:03FFLPT1LPT1

From the device manager I got the following resource data:

COM1 03F8-03FF
COM202F8-02FF
LPT10378-037F
No LPT2

Any hint? Thanks.

Is there a options propertiy for the GPS interface software to tell it which port to use for communications...Could the port be set to Com 1 in this software as the listening port and you have device plugged into Com 2? ALSO guessing that you have baud rate and serial partity bit etc set the same between both com 1 and com 2.

Is this modem an external or internal modem and are you trying to use both devices at same time? ( One device Com 1 and other Com 2 ?) Or is modem used just to troubleshoot com 2 port.Thanks Dave for the reply. The modem is a Pactor II external for doing email via HF radio. Both it and the GPS have the option of changing COM ports and I have thoroughly checked out that route. The baud rate and parity are the same on both. It is possible that I would want to use both at the same time but have not attempted that yet as I only have the original COM AVAILABLE. Any ideas are appreciated.More info. It turns out the daughter board wasn't well connected. Once I reinstalled, the system saw the additional ports. Unfortunately they still don't work. They are properly enabled in BIOS and set up with the following addresses:

Serial 1 3F8 IRQ4
Serial 2 2F8 IRQ3
Add-on Serial 3 3E8 IRQ4
Add-on Serial 4 2E8 IRQ3

I have TRIED a GPS and a Pactor II modem on each adjusting the software according to which port is to be used and nothing comes through except on the original COM1 where both the GPS and modem communicate with their respective software applications. Any ideas would be appreciated as I am in Turkey and getting a replacement is going to be difficult.