A first data processing system sends a message to a second data processing system via a modem. A processor of the first data processing system executes the instructions of an encoding algorithm stored in a memory of the first data processing system thereby encoding the characters of the message as the...http://www.google.com/patents/US4752765?utm_source=gb-gplus-sharePatent US4752765 - Apparatus, method and algorithm for encoding and decoding characters in a message to be transmitted between a first system and a second system
