Abstract: A serial data direct memory access system including a control circuit that shares control with a master computer of an interface bus of a DMA storage system. Serial data is supply to the control circuit via a fiber optic cable. The control circuit employs means responsive to status code bits of the message words for gaining control from the master computer of the interface bus and for directly accessing the computer controlled bus memory storage system. This system is capable of handling data streams of infinite lengths. Also, means are provided for preventing bit errors from interfering with critical message words.

Abstract: An optics fiber multiplexed data acquisition system includes an analog modular for collecting data and then transmitting the data by fiber optics cable to a memory module located at a remote location. The memory module employs means for directly accessing a computer controlled bus memory storage system.

Abstract: A digital readout test probe comprises: a dual in-line pin, clip-on-type connector for connection to a dual in-line pin integrated circuit; a housing containing a single digit decimal readout display; and a converter circuit whose output drives the readout and whose input is coupled with the clip-on connector by means of color coded lead wires. The display and converter circuit are energized from a separate power supply. When the connector is operatively connected with an integrated circuit, signals from selected terminal pins of the integrated circuit are supplied through the lead wires to the converter circuit. The selected terminal pins provide a binary coded decimal signal and the display shows the decimal value of the binary coded decimal signal so that the user of the probe does not have to decode the binary coded decimal signal into decimal form. The clip-type connector comprises a plurality of conductors each of which conducts a signal from a corresponding terminal pin of the integrated circuit.