Abstract: A system and method of transferring characters from a first device through a buffer memory to a second device. A descriptor is read and a buffer address and a buffer length are extracted from the descriptor, wherein the buffer address and buffer length define a buffer of data stored in the first device. The data stored in the buffer is transferred from the buffer to the buffer memory, and from there to the second device. A check is made to determine if the descriptor should be closed and, if the descriptor should be closed, an indication is made that the descriptor is closed.

Abstract: A server has one or more communication ports. A host computer has a driver communicatively coupling the host computer to the server via a secure encrypted network connection. The driver emulates the one or more communication ports of the server by defining a corresponding local communication port for each of the communication ports of the server, and further includes an application programming interface (API) by which an application program executing on the host computer is granted full control of one of the communication ports of the server, including hardware and software flow control, as if the communication ports of the server were local to the host computer.

Abstract: A method and apparatus for unambiguous, precise and self-calibrating detection of unreliable semiconductor operation is provided. The apparatus includes an optically coupled sensor positioned over a semiconductor device and an electrical feedback control loop for adjusting the operating range of the semiconductor device. The method includes the steps of measuring optical emissions from a semiconductor device and adjusting compensation circuitry connected to the semiconductor device in response to the measured emissions.