Abstract: An analog video interface for a digital video display, comprising an analog video input for receiving at least one analog video signal with composite or separate horizontal and vertical deflection signals; digitizing apparatus for digitizing the analog video signal; apparatus for generating a basic clock signal having a frequency at least n times a desired video frequency, where n.gtoreq.1 and for generating control signals for the digital display and a sampling clock signal for the digitizing means in synchronization with the basic clock signal. The video interface further includes determining the actual video frequency of the analog video signal from the actual received video signals and a programmable frequency synthesizer responsive to the actual video frequency for synthesizing the basic clock signal having a frequency at least n times the determined actual video frequency where n.gtoreq.1.

Abstract: The invention relates to a method for interfacing a transmission control protocol/internet protocol (TCP/IP) area network (LAN) to a wide are network via a MAC manager. The TCP/IP software uses a lower-level address resolution protocol (ARP) protocol to find physical network addresses corresponding to logical internet protocol (IP) addresses, and a lower-level IP protocol to transfer useful traffic in IP data packets. In the invention, the media access control (MAC) manager of the wide area network (3) simulates operation complying with the ARP protocol towards the TCP/IP software, and transmits and receives only IP data packets over the wide area network (3) in a manner specific to the wide area network.

Abstract: The invention relates to a video display unit (10) comprising a built-in power supply (5) and at least one electrically controlled power switch (4) for connecting mains voltage to the power supply. The power switch comprises at least one electrically controlled switch (4). In addition, the display unit comprises a control circuit (6) which closes and opens said at least one switch (4) for switching on and off the display unit in response to the state of at least one video or deflection signal received by the display unit or a command received via a communication channel (9) utilizing the signals of the video interface.

Abstract: The invention relates to a device for protecting a memory or microcircuit unit, such as a PCMCIA card. The device comprises a mounting place receiving the memory or microcircuit unit and a protective lid. The lid pivotably attached to a locking mechanism of the protective device, operated by a removable key, is turned to protect the memory or microcircuit unit positioned in its place, when the key is turned to an ON position in the protective device.

Abstract: The invention relates to a method of and an arrangement for controlling the cursor movement on a computer display by means of a pointing device such as a mouse. The mouse driver, which is installed in the computer, converts the manually caused movement of the ball of the mouse to a corresponding scaled movement of the cursor on the display.

Abstract: A printer including a print head; a paper path for a document to be printed; and a document transfer device. The document transfer device is arranged in connection with the paper path and provided with parallel drive pulleys (6) gripping the underside of the document and positioned on at least two sequential shafts (5) and with spring-actuated pressure rollers (9) pressing the document from above against the drive pulleys, at least a part of the pressure rollers being provided with drive and the rollers being arranged in parallel, like the drive pulleys, and disposed sequentially above the drive pulleys to form pairs of drive pulleys and pressure rollers. The printer also includes a stop device positioned on the paper path for straightening the document.

Abstract: A printer, comprising a print head; a paper path for a document to be printed; and a document transfer device arranged in connection with the paper path. The document transfer device is provided with parallel drive pulleys (5) gripping the underside of the document (3) and positioned on at least two sequential shafts and with spring-actuated pressure rollers (8) pressing the document from above against the drive pulleys, at least a part of the pressure rollers being possibly provided with drive and the rollers being arranged in parallel, like the drive pulleys, and sequentially above the drive pulleys to form pairs of drive pulleys and pressure rollers. The document transfer device further includes a plate-shaped stop means (9) to be guided to the paper path for straigthening the document. The stop member is positioned between the middle line through the axes of the rollers (8) positioned in the first row of the pairs of drive pulleys and pressure rollers and the rear line of said rollers.