Abstract: A programmable system for testing relays and controlling systems is provided. In one embodiment the present disclosure provides a programmable device capable of, for example, testing relays. The device includes a signal generator for generating signals to test relays. The device includes a memory location, and a first program stored in the memory location. The first program supports relay testing. The device includes a versioned program to support relay testing, and a processor in communication with the signal generator and the memory location. The device also includes a routine that is operable by the processor to install a versioned program in the memory location replacing the first program.

Abstract: A system for testing a relay is provided. The system includes a plurality of signal generators to generate signals to test relays. The system includes a controller to provide at least some inputs for use by at least one of the signal generators to generate the signals. The system also includes a hand-held controller in communication with the controller. The hand-held controller is operable to receive and display relay test information for a user. The hand-held controller is operable to transmit one or more control inputs for testing the relay.

Abstract: An interface for coupling a computer to a plurality of magnetic tape transports, including dual-density transports and combinations of high and low density transports. The interface includes an automatic density selector for detecting the density of data stored on a tape prior to reading and for storing this information for as long as the tape is being used. A read-only memory and other logic circuitry translate computer operating commands into commands readable by a transport formatter. The interface also couples digital data between the computer and the formatter and converts formatter status information into language readable by the computer.

Abstract: This disclosure describes a decoding system for decoding and formatting digital data recorded on magnetic tape in the STR ("speed-tolerant recording") format. The digital words are stored in cells of about equal width except that the leading cell of each word, called a "sync" cell, is of double width. Each cell starts with a positive pulse, and a cell detector provides a signal each time this occurs. The apparatus includes a data detector, which analyzes the width of this positive pulse relative to the cell width to determine whether the cell is a 1 bit or a 0 bit. Since the measurement is relative, cell length, i.e., total cell time, is not important. The bit determination is loaded into a shift register. Other apparatus determines the width of the cell, so that a sync cell detector can determine whether a sync cell is present or not. When a sync cell is detected, a pulse is generated which actuates the output buffer register to load the bits from the shift register. Data flows from buffer to a computer.