摘要:
A high precision linear positioning system for the positioning of signal heads in magnetic disc data storage systems or the like employing an actuator having an axially movable magnet rod mechanically linked to the head and a pair of fixed electromagnet coils respectively disposed about the ends of the magnet rod. The coils are suitably energized by an electronic control circuit to impart motive force to the magnet rod. The actuator includes a phototransducer assembly adapted to produce binary coded electrical signals corresponding to the specific track address at which the head is instantly located. The electronic control circuit is adapted for two modes of operation. In the first mode, the electronic control circuit functions to continuously subtract the desired binary track address entered into the system from the instant binary track address produced by the phototransducer assembly, and to velocity servo the actuator in response thereto. In the second mode of operation, employed after the head has reached the desired track, suitable switching circuitry interconnects the electronic control circuit in a position servo mode, employing as input, signals from additional photosensors in the phototransducer assembly, disposed in quadrature, to precisely position and detent the head above the desired track.
摘要:
A signal storage apparatus which includes at least one storage drum rotatable about its axis and having a cylindrical signalstoring surface provided with circumferentially extending tracks, and a plurality of magnetic read-write heads disposed in a row parallel to the drum axis and located opposite the signal-storing surface so as to respectively cooperate with the tracks during rotation of the drum. The heads are together movable in direction of the drum axis between a plurality of positions so as to cooperate with selected different tracks and electric switch means are connected to the heads for controlling the storage of signals in the tracks and the reading out of stored signals from the tracks.
摘要:
Record units, each addressable by a record unit address, have keyfields with keyfield bits arranged to be presented in descending order of significance. The record unit addresses are separated into first and second address groups, comprising all addresses corresponding, respectively, to record units having a most significant keyfield bit of 0 and 1. The first and second address groups are each similarly subdivided into two successive address sub-groups in dependence on the next most significant keyfield bit of each record unit. The separating process of each successive sub-groups of addresses is continued under control of equally weighted bits from each record unit until all keyfield bits have been utilized. A system of indicator numbers are assigned to each record unit address and are modified during each successive sub-grouping to reflect from which of the immediately preceding sub-groups the address is derived.
摘要:
Information units are stored in a first sequence in a first cyclic storage unit and are transferred to a processing storage operating in synchronism with said first cyclic storage (i.e., at either the same or an integral multiple rate) under control of a control and processing unit. A key field associated with each information unit is fed to the control and processing unit which then controls transfer from the processing storage to second cyclic storage in such a manner that the information units are arranged in a predetermined sequence in accordance with the key fields of the units. The second cyclic storage unit operates at the same rate as the first cyclic storage unit. Merging may be accomplished by similar transfer from a first and second storage unit to a third and fourth cyclic storage unit.
摘要:
A storage device to serve as a temporary or buffer storage includes a plurality of different memory locations, data entering and data sensing devices and associated equipment permitting the individual and independent addressing of each storage location. A first set of switching circuits interrelate certain data entering and data reading devices with the storage device and a further set of switching circuits interrelate other groups of data entering and reading devices to the storage device, all of which switching circuits are individually controllable such that the associated entering and reading devices can be individually and independently placed in an active state at different or the same times. Individual terminals or ports are also provided interconnecting the various switching circuits with peripheral equipment, e.g., CRT displays, magnetic tape, and data processing equipment.
摘要:
A keyboard has keys arranged in denominations and digits within a denomination, each key connecting a digit and denomination selection line, thus storing a digit. A disc has groups of storage locations corresponding to denominations and dynamic storage positions in each group corresponding to the digits, the disc moving relative to reading and writing heads, associated respectively with input and output storage positions on the disc. Each digit selection line is connected to a writing head. A distributor applies signals from the reading heads in a predetermined sequence to the denomination lines in synchronism with the movement of the disc past the read and write head. Signals are thus transferred from the input storage positions on the disc to the output storage positions, the positioning in the output storage positions depending both upon the numbers stored in the input storage positions on the disc and the numbers stored in the keyboard, as well as an arithmetic operation connecting the two numbers.
摘要:
Record unit addresses, providing access to corresponding record units having keyfields, are stored in a first storage, each under control of the corresponding least significant keyfield bit. Zero keyfield bits cause storage of record unit addresses in sequential locations following a ''''0'''' assigned storage location; ''''1'''' keyfield bits cause storage of record unit addresses in sequential locations following a ''''1'''' assigned storage location. Record unit addresses in the ''''0'''' assigned storage locations of the first storage are then transferred to a second storage in the same manner under control of the next significant keyfield bit. Next, the record unit addresses in the ''''1'''' assigned storage locations of the first storage are so transferred to the second storage. The transfers are repeated under control of all keyfield bits, read-out from ''''0'''' assigned storage locations always preceding read-out from ''''1'''' assigned storage locations.