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Installing
With the computer off, insert the adapter in an available ISA slot and power on. Once in NT, check Ports in the Control Panel. You should see the additional serial port(s) listed here now. This port(s) will now function at the UART specified by the card’s jumper and can be used now. Keep in mind that, under the Port properties, the baud rates will be the same regardless of the UART. When operating in high speed mode, make sure to multiply the baud rate by 4. So a 9600 in normal mode would be 38400 in high speed mode (9600 x 4 = 38400).
Troubleshooting
If the port fails to work, make sure that it showed up under Ports after installing the card. If you do not see any additional ports listed after installing the card, then your BIOS is not recognizing it. Also make sure that in Control Panel> Services, that the Plug and Play Service is started and set to “automatic”. This service is not the same as having the PNPISA utility on the NT CD installed. Otherwise, make sure your BIOS is set to a