Sperry Rand Corporation

Glen Roy Kregness

Jerry Hudson Pertl

This invention relates to a right justified mask transfer apparatus which may be effectively utilized in a digital data computer. A right justified mask transfer register is provided which holds the result of a logical bit-by-bit ANDing of a multi-bit data word with a multi-bit mask work such that only those bit positions for which the mask word are of a predetermined binary significance are collected contiguously in the mask transfer register, all other bit positions being ignored. Further operations on intermediate digital data computations may be more easily performed by utilizing the right justified mask transfer function to select certain data bits or fields.

Right justified mask transfer apparatus

A self-test monitor and diagnostic apparatus which includes a test step counter, an error comparator apparatus, which may be a memory device loaded so as to predict the proper state of each of the lines to be monitored at each test step and which functions to detect any difference between what should be occurring at that test step and what is, in fact, occurring on the monitored line, and an error localization network which translates the detected errors into a displayable code for maintenance isolation.

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Hopkins, MN, United States of America

Glen Roy Kregness