Abstract:
A method and apparatus performs detection of an edge and detection of holes or other data patterns on a tape or other magnetic or optical medium. An array of photodetectors in an integrated circuit chip senses the intensity of light illuminating the chip with the tape running between a light source and the photodetectors. The holes or the other data patterns are sensed on the tape based on a comparison between detected light intensities with a programmable reference level. In addition, areas which may normally be sensed as a hole are discarded if these areas fall within a specified tolerance.
Abstract:
A system detects a pattern of holes in a magnetic medium for determining a characteristic of the tape, such as the type of data contained on the tape. A memory device, such as a FLASH memory, is automatically updated when a predetermined pattern is detected. The updating is performed using a read operation without the need for a host system.
Abstract:
In a tape cartridge of the type used to store data on a magnetic tape in a high-speed data storage and retrieval system, the tape must be maintained at a proper tension within the cartridge so as to maintain the tape taut against the write/read head. Slackness in the tape occurs after a repeated number of changes in the tape transport direction or start/stop events, because the tension experienced by the tape is not the same in both transport directions. A method and apparatus for maintaining tape tension are disclosed wherein a selected tape characteristic is monitored, the characteristic changing as the tape tension changes. If the monitored characteristic exceeds a predetermined value, or after the passage of a selected amount of time, when the next reversal of tape transport direction occurs, the tape is moved a selected distance longer than necessary to effect the reversal so that when a desired data location on the tape reaches the location of the write/read head, the tape will again be at the proper tension.
Abstract:
Ein Verfahren zum Kompensieren des elektrischen Wechselfeldes an der Frontfläche von Kathodenstrahl-Bildröhren (1), welchen von einem Hochspannungsgenerator (2) eine Hochspannung mit einem Anteil an Wechselspannung über einen EHT-Hochspannungsanschluß (10) zugeführt wird, ist dadurch gekennzeichnet, daß die Wechselspannung auf der Verbindungsleitung (5) zwischen Hochspannungsgenerator (2) und EHT-Hochspannungsanschluß (10) abgetastet wird, die Wechselspannung verstärkt und invertiert wird (siehe 3) und die invertierte Wechselspannung auf wenigstens eine in unmittelbarer Umgebung der Bildröhre vorgesehene externe Elektrode (12) aufgegeben wird. Eine Vorrichtung, insbesondere zum Durchführen des Verfahrens weist einen Invertierverstärker (3) für Wechselspannung mit einem Eingang für die auf der Verbindungsleitung (5) zwischen Hochspannungsgenerator (2) und EHT-Hochspannungsanschluß (10) abgenommenene Wechselspannung auf, wobei in unmittelbarer Umgebung der Bildröhre (1) wenigstens eine externe Elektrode (12) vorgesehen ist.
Abstract:
A computer keyboard mouse system wherein a mouse assembly is integrated into a front or side wall of a keyboard of the computer. A control ball of the mouse assembly protrudes from the front or side wall for control by the operator. To protect against forces directed against the ball of the mouse assembly which could damage it, a ball retaining member is spring loaded such that excessive forces to be protected against will cause the ball to be pushed into the front or side wall. Mouse control keys may be provided adjacent to the mouse assembly on the front or side wall. Also, the control keys can be one or more designated keys of the keyboard itself.
Abstract:
A data storage device is disclosed having associated therewith a removable storage medium. The data storage device has a main control unit with a microprocessor. The system is designed such that an internal control program for control of the media is stored directly on the media itself. By use of a boot program which can be stored in the microprocessor or separately from the microprocessor, the control program is read off of the media by the microprocessor and is stored in a main control program storage within the data storage device. The main control program storage is an erasible storage like an EEPROM, RAM, or flash memory.