Abstract: A fiscal control unit system may include a central processor unit that includes a first processing unit and a second processing unit that operates independently of the first processing unit, and isolated from the first processing unit. A buffer module may operate within the first processing unit to provide communication with a fiscal control server and an electronic transaction register and wherein the buffer module may receive transaction registrations from the electronic transaction register. A signing module may operate within the second processing unit, to communicate with the buffer module, and to provide a cryptographic record of transaction registrations received by the buffer module.

Abstract: A video compensation system for analog video transmission is described. The compensation system is employed in an analog video switching circuit such that each time a conductive path is switched, the system automatically tests the new switch path for a new compensation value. The compensation value is determined by measuring the response of the new path to a set of tones that are applied to the conductive path, the response to which is measured against a table of responses previously recorded. The measured responses are compared to the recorded responses to determine an appropriate compensation control voltage, which is applied to an equalizer system. In an alternative embodiment, the skew compensations also provided between red, green, and blue twisted pair lines in the cables by performing comparative analysis between corresponding pairs of the red, green, and blue signals.