A cable-swivel device for delivering shock to tail or harness electrodes

An inexpensive cable-swivel device for delivering shock to tail or harness electrodes is described.     

A solid-state device for eliminating electrical noise and biopotentials in electromyographic (EMG) recordings

A small, low-cost, integrated circuit device is described. This circuit reduces electrical noise, such as that produced from a poor electrode-skin interface and power-line interference (60 Hz). Advantages of this device, with regard to use in electrically noisy environments and with long cables, are discussed.     

The TMS 9918A VDP: A new device for generating moving displays on a microcomputer

A procedure for creating smooth and continuous moving displays on a microcomputer using the TMS 9918A video display processor (VDP) is discussed. This processor shares all of the features of other VDPs and, in addition, enables the user to directly program smooth motion of specified graphics shapes (sprites) with multilevel pattern overlaying. The general principles for programming this video chip are described, and a machine language driver is presented. Three illustrative applications from the event perception literature—wheel-generated motion, kinetic disruption of optical texture, and biomechanical motions—are presented as demonstrations of how the unique features of this video chip can be implemented in the creation of dynamic displays.