Abstract: In circuit modifications of dual in line packaged (DIP) devices are realized by a circuit modification device that interfaces the DIP and its companion device. A first pair of single in line packaged (DIP) header pins are mounted on a printed circuit (PC) board such that they form a socket for the DIP device. A second pair of SIP header pins are mounted adjacent to the first pair and extend through the PC board to form a plug for the companion device. Header pins are interconnected by the printed circuit to effect the desired DIP device circuit reconfiguration. Packaging is accomplished with commercially available components and does not impact system size, weight or power constraints.

Abstract: A maintenance training system capable of precisely simulating both the inner and the outward functions of original electronic equipment is realized by utilizing a programmable waveform generator, a microcomputer and interfacing input/output circuits in a modular design that can be adapted to use with virtually any desired electronic system maintenance trainer. The system provides genuine waveform generation and display in a real time maintenance trainer with positive input/output control through line replacable unit read/write modules. The programmable waveform generator develops analog waveforms from digital control and picture data received from the micro-computer. The analog outputs of the programmable waveform generator drive the maintenance trainer's external meters, displays and oscilloscope and can be programmed to simulate point by point circuit tracing of the original electronic equipment.