This manual describes the CALM TV graphics interface, a low-cost means of producing quality graphics on an ordinary TV. The system permits the output of data in graphic as well as alphanumeric form and the input of data from the face of the TV using a light pen. The integrated circuits required in the interface can be obtained from standard suppliers for under $200. Provided in this document is all the information needed to construct this interface and interface it to standard output ports on any computer. One particular hardware configuration is illustrated with the TV interface and is connected to an S-100 based Z-80 system. (BB)