Abstract: A fairness protocol circuit for a token ring local area network adaptor having a data-in line for serially carrying tokens/frames and a shift register delay of at least 18 bauds with an input coupled to the data-in line. A TTT stack is coupled to the shift register delay for serially storing values of old token indicators. An III stack is provided for serially storing values of new token priority indicators. TTT means is coupled to the TTT stack for temporarily storing a last old token placed on the TTT stack and serially outputting its bits. The stacks shift up or down bit by bit in response to UNSTACK or STACK control signals and are cleared in response to a clear signal.

Abstract: The specification discloses a method and system wherein an operator interacts with an automatic data processing and display system to classify and sort subsurface reflective surfaces or segments in a multidimensional context. The technique utilizes a properly programmed general purpose digital computer in combination with a plurality of storage tube display screens. Seismic reflection data in the form of computer picked reflection segments, hereinafter referred to as seismic segment data, produced from previous computer processing steps is entered into the computer. Displays of the velocity, amplitude, dip and length of the segments in a space gate are then provided on the display screens. A data responsive surface having a network of conductive wires and a detecting stylus are utilized by the operator to operate upon the displayed segment data to classify primary segments and to define boundaries relative to each of the parameter displays.