Abstract: A system for inputting any one of a plurality of inputs to a computer includes a latch circuit which provides an input to the computer in response to the input. The latch circuit also provides a start signal to the computer when the parity is correct. The start signal is delayed so that the system is independent of the amount of time that a switch is held closed by the operator.

Abstract: A switch arrangement for providing access commands to a computer includes a plurality of switches categorized into three groups. The first group is exclusive or whereby only one of the switches within the group can access the computer at a given time. The second group is prioritized whereby the switches within the group access the computer in accordance with an assigned priority. The third group is random whereby any or all of the switches can access the computer at a given time.

Abstract: A system for providing a security code to a computer includes security bit input logic for each bit of the security code. The input logic includes a plurality of output lines whereby the security bit can be provided on any combination of the output lines selected. Output line selection logic selects the output line over which the bit is provided. The input logic is sequentially scanned whereby the security bits are sequentially provided to the computer.

Abstract: A system for inputting a multi-bit input to a computer in response to the closing of a single switch includes a multi-line to a single line encoder. A plurality of input switches individually set different input position numbers into the encoder. When the input from a binary counter equals the number, the number is output to the computer.

Abstract: A system for converting the frequency of a pulse train to a binary number includes an output counter which converts the pulse train to the binary number. Sampling time periods are applied as pulses to a comparator through another counter. The number of desired sampling periods is set into the comparator. The comparator enables the counter during the sampling time periods and inhibits the output counter on the termination of the total sampling time periods. The output of the output counter, therefore, is a binary representation of the frequency of the incoming pulse train during the total sampling time period.

Abstract: A detector for detecting bare metal on a moving strip of insulatively coated conductive metal includes a plurality of sensors arranged along the edges of both sides of the strip. Each sensor includes a plurality of voltage biased contacts and a grounded contact. The inventive control system provides an actuate pulse when two voltage biased contacts on one sensor are electrically connected to the grounded contact of another sensor in accordance with the Boolean Function:[(AB+BC+CA).multidot.(DE+EF+FD)]+[(GH+HJ+JG).multidot.(KL+LM+MK)]+[(AB+BC+C A).multidot.(GH+HJ+JG)]+[(DE+EF+FD).multidot.(KL+LM+MK)]where the letter designations alphabetically identify the voltage biased contacts of each sensor.