If the ports don't work after installation, check if another device is trying to use the same IRQ or I/O address in the BIOS or Device Manager.
Device Manager ├── Ports (COM & LPT) │ ├── PCI ECP Parallel Port (LPT1 or LPT2) │ ├── PCI Serial Port (COM3) │ └── PCI Serial Port (COM4)
Choose (do not select the automated internet search option).
The strongest match across driver archives is: .
Linux kernels include open-source reverse-engineered drivers for thousands of legacy PCI devices. For Windows, you need the exact signed INF file, which may not exist for Win10.
Newer Windows versions restrict unsigned drivers. To bypass this restriction:
Copy the string (e.g., PCI\VEN_9710&DEV_9835... ) and search for it online to find the specific manufacturer's driver. 2. Direct Download Sources
Once you have VEN and DEV , search pcidatabase.com for exact driver match.
Your current (e.g., Windows 10 64-bit, Windows 7 32-bit)