Abstract: Devices for reducing and determining the skew between colour video signals transmitted over at least two different video cables are described. A KVM extender including such devices is also described. The skew reduction device includes a plurality of video signal transmission tracks selectably connectable to each of the video cables to increase the video signal transmission path length so as to more closely matching the total video signal path length for each of the colour video signals. The skew determination device comprises a processing device, a signal generator for applying measuring signals to each of the video signal cables and signal detection circuitry to receive measuring signals transmitted over the video signal cables. Detection signals are output to the processing device which is programmed to determine an indication of the transmission path length difference between the video signal cables.

Abstract: A device for interfacing an input device and a computer includes a microprocessor in communication with a memory, the memory storing download instructions and having a re-writable memory area for storing input device driver data downloadable by the microprocessor using the download instructions. The microprocessor is programmed to use the input device driver data to enable data transmission between the computer and the input device. In an alternative device, the microprocessor is programmed to extract input device driver data from data transmitted to the device in a standard input device protocol and to save the input device driver data in the memory. An upgradeable KVMA and KVM switch and extender including such devices are described.

Abstract: A device for interfacing an input device and a computer includes a microprocessor in communication with a memory, the memory storing download instructions and having a re-writable memory area for storing input device driver data downloadable by the microprocessor using the download instructions. The microprocessor is programmed to use the input device driver data to enable data transmission between the computer and the input device. In an alternative device, the microprocessor is programmed to extract input device driver data from data transmitted to the device in a standard input device protocol and to save the input device driver data in the memory. An upgradeable KVMA and KVM switch and extender including such devices are described.

Abstract: A system for transmitting electrical signals between a computer and peripherals along a twisted pair cable. The system includes a computer interface, a peripheral interface and a twisted pair cable in communication between the computer interface and the peripheral interface. Video and audio signals from the computer are transmitted via the twisted pair cable to the peripherals. Peripheral signals can also be communicated between the computer and peripherals via the twisted pair cable.