Asmedia Asm1083 Serial - Port Driver Windows 10

Windows 10 has a vast built-in driver library, but support for legacy bridge chips is not always perfect. Specifically:

The most common error codes you will see in Device Manager include:

Without a properly functioning driver, your legacy PCI cards will not be detected by the OS, or the system may experience random freezes when accessing the PCI bus.

You will see "Windows cannot verify the digital signature of this driver" on 64-bit Windows 10.

Permanent Fix (Not recommended for security): asmedia asm1083 serial port driver windows 10

Better Fix (Use test mode permanently): Run Command Prompt as Admin:

bcdedit /set testsigning on

Reboot. You will see "Test Mode" in the corner – now install the driver. After success, run bcdedit /set testsigning off and reboot.

Cause: Windows Update or driver automatic maintenance rolls back to a generic Microsoft driver.

Solution:

Alternatively, use Group Policy (Pro/Enterprise only): Computer Config → Administrative Templates → System → Device Installation → "Prevent installation of devices not described by other policy settings".

| Scenario | Action | | :--- | :--- | | ASM1083 appears in Device Manager with no error | Do nothing. It is working correctly. | | ASM1083 has a yellow exclamation | Update BIOS, reset CMOS, or reinstall chipset drivers. The device itself does not need a driver. | | A COM port (Serial Port) is not working | Identify the actual serial controller's VEN/DEV ID and download its specific Windows 10 driver. | | You are installing a PCIe-to-PCI serial card | Let Windows 10 install the serial driver automatically via Windows Update (often required). |

If the above fails, you can try manually assigning the Windows inbox serial.sys driver:

Some older software (especially industrial automation or legacy GIS software) only looks for COM ports numbered 1 through 4. If Windows assigns the card COM5 or higher, the software won't see it. Windows 10 has a vast built-in driver library,

Since ASMedia (now ASMedia Technology Inc., part of ASRock) does not directly sell consumer serial port cards, drivers are typically provided by the add-in card manufacturer (e.g., Startech, Syba, IO Crest, Delock, or generic Chinese brands).

Cause: Windows insists on using its own generic PCI-to-PCI bridge driver.

Solution: Force driver assignment using the "Have Disk" method with the official ASMedia .inf. You may need to uninstall the current driver first: Right-click → Uninstall → Check "Delete driver software" → Reboot.