Abstract: A data recovery system for deriving digital data from a bi phase encoded stream wherein signal transition occurs at mid-bit or bit boundary having an edge detector for detecting the occurrence of each fallen edge of a data stream, an edge decoder connected to the detector for determining the time between successive falling edges, a falling edge identifier connected to the edge decoder for determining whether a detected fallen edge occurs on a bit boundary or at a mid-bit, a falling edge memory connected to the falling edge identifier for remembering whether the previous falling edge occurred at a bit boundary or at mid-bit, a data decoder connected to receive input from the falling edge memory and the edge decoder, and having logic for determining the recovered data according to a table in which the data is identified in response to the occurrence at a bit boundary or at mid-bit and a selected spacing between falling edges.

Abstract: In a token ring network wiring concentrator providing a low current/low voltage DC control signal to control insertion and removal of a work station, an improved concentrator lobe having a latching relay with a closed position in which communication is provided between a token ring network and a work station and an open position in which such communication is severed, an insertion relay driver circuit responsive to the DC control signal to close the latching relay when the DC control signal reaches a preselected minimum level, a removal relay driver circuit responsive to the DC control signal for opening the latching relay when the DC control signal falls below a preselected level and an insertion indicator LED for indicating when the work station is connected to the token ring network.

Abstract: Compositions for magnetic recording media comprising a nonmagnetic support and a magnetic layer adhered to the nonmagnetic support, wherein the magnetic layer comprises a ferromagnetic substance and a binder system, preferably the binder system comprises primarily a polyester polyurethane polymer and small percentage amounts of a low molecular weight polyol crosslinked with a multifunctional isocyanate. Methods of formation of the compositions are also described. Presence of the low molecular weight polyol is particularly important in attaining desired performance characteristics in wound pile stability, layer-to-layer adhesion, and durability.

Abstract: A novel resinous binder composition is disclosed for a magnetic recording tape. Magnetic particles are dispersed within a resinous matrix having both a hard and soft component. The hard component is fabricated by exposing a resin capable of being cured by electron beam irradiation to set the radiation forming a semi-interpenetrating network with "soft" material.