Abstract: This invention relates to an apparatus and method for preventing a digital computer from erroneously outputting data contained in an output word to another digital computer or peripheral device. A portion of the output word is allocated as a key field which must be matched with a predetermined lock value before the digital computer will allow an output of the data field of the output word to occur. That is, a key value specified as part of the output word must match a predetermined lock value before an output transfer of the data field of the output word is allowed to take place. If the lock value and key value do not match, the central processor section of the digital computer is interrupted. This apparatus and method not only verifies the correct operation of the digital computer output data transfer hardware by preventing an erroneous transfer of the data field of the output word but also alerts the central processor section in the event of a mismatch by means of an interrupt.

Abstract: This invention relates to a clock sequencing apparatus which allows for clock stoppage at the end of a particular clock sequence without a false decoding of clock pulses at the beginning of what would have been the next clock sequence. This result is accomplished by providing a multi-state sequential apparatus having more states than clock phases. The apparatus will detect a stop condition on the last clock phase of a clock sequence and instead of changing to the state associated with the first clock phase of the next clock sequence, it will instead change state to one or more additional "dead time" states which will allow other logic circuitry to discontinue gating of the clock phases before the apparatus returns to the state associated with the first phase of the next clock sequence. The apparatus will then remain at the state associated with the first phase of the next clock sequence until the clock is restarted and the process is repeated.

Abstract: 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.

Abstract: This invention relates to an apparatus for shock mounting in a frame a cathode ray tube of the type having a rear neck portion containing an electron gun integrally formed with a frustum which terminates in a planar or spherical surface on which information is displayed. Compared to the frustum portion, a relatively narrow first annular member constructed of a substantially rigid material is positioned along the cathode ray tube near the convergence of the frustum portion with the neck. This first ring is affixed solidly to the cathode ray tube and has an outer surface which is formed by two surfaces which form an angle with the cathode ray tube's major axis. As such, a surface is provided for opposing a force directed substantially parallel to major axis.

Abstract: 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.

Abstract: A digital data communication system having a plurality of digital nodal communication devices interconnected by a digital data bus in a fixed physical manner in which the data bus structure may be electrically reconfigured without physical modification of the digital data bus. The ability to reconfigure the digital data bus is accomplished by the insertion of a digital reconfigurable data bus module into the position on the digital data bus previously held by one of the digital nodal communication devices and the connection of the replaced digital nodal communication device to the digital reconfigurable data bus module.

Abstract: This invention relates to an apparatus facilitating the mechanized manufacture of intermediately tapped electrical transformers. The apparatus winds coils on open ferromagnetic bobbin-type cores automatically by winding wire around the bobbin cores, pulling the tap, if any, and securing the wires so that they will not unwind. The bobbins are manually loaded into a rotatable turret wheel which sequentially positions them in a work station. A motor driven bail engages the wire and causes the wire to be wrapped around the bobbin located at the work station a predetermined number of times. When the number is reached, a solenoid operated hook grasps the wire, pulls the wire away from the bobbin, forming a loop, and is rotated so as to twist the wire as the bail continues to cause a second predetermined number of turns to be wound on the bobbin. The twisting ultimately causes the wire loop between the first and second sets of windings to snap at the hook creating a winding tap.