SU401991A1 - DEVICE FOR DISPLAYING OF DIGITAL-LETTER INFORMATION - Google Patents

Description

one

The invention relates to the field of automation and computer technology and can be used as an external digital computer device for outputting alphanumeric information to the screen of an electron-beam tube.

Devices for displaying alphanumeric information are known, comprising a serially connected keyboard, an interface unit, a buffer memory, a symbol generator, a modulation unit and an electron beam tube, as well as a control unit associated with the interface unit and a horizontal sweep counter. One horizontal output of the scan counter is through a digital-to-analog horizontal scan converter connected to the horizontal deflection system of a cathode ray tube, and the other via serially connected vertical scan counters and a digital-to-analog converter of a vertical scan is connected to the vertical deflection system of a cathode ray tube.

The proposed device is characterized in that it additionally includes a horizontal reversing beam moving counter, a vertical moving reversing counter, two three-position beam moving switches, respectively, horizontally and vertically, a reversible electronic counter control unit, and an information reset unit. Moreover, the outputs of the reversible counter control unit are connected to two three-position switches, the outputs of which are connected to the addition and subtraction buses of the corresponding reversible counters connected to the digital-to-analog converters of horizontal and vertical scanning, and also connected to the reset unit connected to the block mates, a buffer storage device and a control unit.

This allows control of the movement of the image of the alphanumeric text on the screen of the cathode ray tube.

The drawing shows the block diagram of the described device.

The device contains an interface unit 1, a buffer memory device 2, a symbol generator 3, a modulation unit 4, an electron beam tube (CRT) 5, a control unit 6, a horizontal sweep counter 7, a digital-to-analog horizontal converter converter 8, a vertical sweep counter 9, digital-to-analog vertical converter 10, keyboard 11, information reset unit 12, reversing counter for moving vertically 13, reversing counter

horizontal movement 14, a three-position beam moving switch vertically 15, a three-position horizontal beam switching switch 16 and a control unit for reversing counters 17.

The device works the following way.

Information, for example, from a digital computer through interface block 1 is stored in a buffer memory device 2, is converted by the symbol generator 3 into the corresponding control signals and through a modulation unit 4 is fed to the screen of a CRT tube 5.

The horizontal and vertical scanning counters 7 under the influence of the signals of the control unit 6 together with the converters 8 and. 10 form an image of alphanumeric text on the screen of a CRT tube.

Keyboard 11 allows for the correction of text on a CRT screen. Using the switches 15 and 16, you can move the alphanumeric text around the screen.

Depending on the position of the switches, the following modes of operation of the device are possible.

Mode I. Switches 15 and 16 are in the "Stop.

In this mode, the sweep occurs in the usual way. Reversible counters 13 and 14 are in a state equal to half their maximum values. The image on the screen is still.

Mode II. Switch 15 is in the "+" position, switch 16 is in the "Stop.

Horizontal sweep occurs in the usual way, and an additional sweep is added to the main vertical sweep. The latter is carried out as follows: a vertical 13 13 scanner is counted by a switch 15 from the control unit of the reverse counters 7 to receive pulses with a vertical scan frequency. The number of incoming pulses is determined by the influence of switch status 15. As a result of the joint operation of counters 3 and 9, the lines are moved vertically up the screen by an amount equal to the distance between the lines.

The up / down counter 13 operates in the subtraction mode until its state is 0. At this point, the information reset unit 12 generates a signal to erase the first line in the buffer memory 2 and to request a new information from the digital computer. At the beginning of the next sweep period, a new line is recorded in the buffer memory instead of the first line of the image, which should be displayed on the screen after the last line of the original image is displayed. The image sweep begins with the information in the buffer storage device, which corresponds to the second row of the image. Thus, continuous movement of the image upwards on the screen is provided.

Mode III. Switch 15 is in the “-” position, switch 16 is in the “Ston.

The reversible counter of movement along the vertical 13 operates in the addition mode until the moment of overflow. The last line is output from the buffer storage device, and the first place is entered with new information. The control unit 6 provides a scan of the newly deployed line in place of the first line, and the second line begins to scan the rest of the information. Thus, the image is moved down the screen.

Mode IV. Switch 15 is in the "Stop" position, switch 16 is in the "+" position.

A vertical sweep occurs in the usual way, and an additional one is added to the horizontal horizontal sweep, the state of which is determined by a reversible horizontal displacement counter 14. To the input of the counter 14, through the switch 16, pulses are received with a horizontal sweep frequency. The counter 14 operates in a subtraction mode until its state becomes 0.

As a result of the joint operation of the counters 7 and 14, the image along the horizontal is moved to the left across the screen by an amount equal to one familiarity. At this moment, the information reset circuit 12 generates a signal about the output from the buffer storage device 2 of the line, the image of which has gone beyond the limits of the screen, and new information is being written. This information is entered in place of the output. The control unit 6 provides a scan of the newly received information in the place of the first column of the text image. The rest of the information unfolds on the screen, starting with the second column.

Mode V. Switch 1.5 is in the position of "Ston, switch 16 is in the position of" -.

In this case, the reversible counter 14 operates in the addition mode until the moment of non-replenishing. As a result of the movement, the left column of the image is out of the screen. The information corresponding to this column is output from the buffer memory device and new information is entered in its place.

The control unit 6 provides a sweep of information starting from the first column, and the newly received information is displayed after the last row. Thus, this mode moves the image to the right across the screen.

Subject invention

A device for displaying alphanumeric information comprising a serially connected keyboard, an interface unit, a buffer memory, a symbol generator, a modulation unit, and an electron-beam tube, as well as a control unit associated with the interface unit and a horizontal sweep counter, one the output of which is connected to a horizontal deflection system of a cathode-ray tube via a digital-to-analogue horizontal scanning converter, and another one through a serially connected counter Vertical bores and a digital-to-analog vertical scan converter are connected to a vertical deflection system of a cathode ray tube, characterized in that, in order to obtain controlled image movement on the screen of a cathode ray tube, reversible

horizontal and vertical displacement meters, three-horizontal horizontal and vertical beam movement switches, a reversible counter control unit and

information reset unit; the outputs of the control unit of the reversible counters are connected to three-position switches, the outputs of which are connected to the folding and subtracting buses of the corresponding reversible counters connected to the digital-to-analog converters of horizontal and vertical scanning and the information reset unit, which is connected to the interface block buffer memory by device

and control unit.