The controller card, or simply "controller," is a piece of hardware that acts as the interface between the motherboard and the other components of the computer. For example, hard drives, optical drives, printers, keyboards, and mice all require controllers to work. Most computers have all the necessary controllers built in the motherboard as chips, not full-sized cards. However, if you add additional components such as a SCSI hard drive, you may need to add a controller card as well. Controller cards are typically installed in one of the computer's PCI slots.

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• DBi-Directional IEE Parallel
• DUSB to Parallel Cable
• USB Card with 2 ports
• Mercury PCI Parallel Cable
• CMulimedia Access Panel
• USB Bay mount 4 port Hub
• USB to Serial Cable
• Lava PCI Serial 1-Parallel PCI
• Mercury 2-Serial 1-Parallel PCI
• Mercury USB 2.0 Card 4-Ports
• Lava Dual Parallel Port PCI
• Lava Dual Serial Port PCI
• Mercury USB 2.0 Kit Front Rear
• Mercury Firewire 3 Port PCI