Serial bus controllers are what the BIOS calls USB (universal serial bus). I think typically pairs of ports off the USB controllers show up on there. The motherboard probably has 2 pairs and the PCI card might have 3 pairs (or 2 pairs and a single lone port).
Pilote Pci Universal Serial Bus Windows 98
The device does not have a device driver: When a device driver for a device is not available, Device Manager displays the device as Unknown Device and puts it in the Other devices branch. This is very common with universal serial bus (USB) and Institute of Electrical and Electronics Engineering (IEEE) 1394 composite devices. Also, a status of Error Code 1 or Error Code 10 may be displayed when you view the properties of the device in Device Manager.Note Most USB and IEEE 1394 devices function correctly without additional device drivers because they are configured by the drivers that are included with Windows for these bus types. However, an additional device driver is needed if the device does not fit the defined and supplied Windows class drivers. If the bus cannot identify the device, it interprets the device as a composite device and then reports it as such in Device Manager. 2ff7e9595c
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