Abstract: An expanding apparatus for expanding functions of a personal computer includes a support assembly for supporting a connector of the expanding apparatus to be movable in a predetermined direction between a stand-by position and a pushed-in position for engaging and disengaging a connector of the expanding apparatus from the personal computer. The support assembly includes a support member to which the connector of the expanding apparatus is attached. The support assembly has a plurality of guide holes. A plurality of guide members extend from a main body of the expanding apparatus, in the predetermined direction, through respective guide holes. Each of the guide members has an extended end, with a stopper provided on the extended end for abutting the support member when the support assembly is in the stand-by position. The stopper thus limits the movement of the connector.

Abstract: Data transmitted from a local terminal to a remote terminal is converted into such a diphase data signal that a data bit of binary "0" is represented by a signal with two transitions, and a data bit of binary "1" is represented by a signal with one transition. Data transmitted from the remote terminal to the local terminal is modulated by the diphase data signal of the local terminal, and delivered to the local terminal in the form of a diphase data signal. In the local terminal, the coded diphase data signal from the remote terminal is demodulated by the diphase data signal of the local terminal, and regenerated into the transmission data of the remote terminal.