SU1291955A1 - Device for displaying information on screen of cathode-ray tube - Google Patents

Abstract

The invention relates to the field of automation and computer technology and can be used in devices for outputting alphanumeric information to the screen of a cathode ray tube. The purpose of the invention is to expand the field of application due to the possibility of changing the background of the image at an arbitrary point in time. The goal is achieved by introducing into a device containing two memory blocks, two registers, three groups of elements AND, a group of elements OR, a symbol generator consisting of a ROM and a raster line generator, a video signal forming unit, a control unit — two elements OR, a third register modulo two block. Inverting codes with these elements allows you to change the background of the image and increase its informational content. 2 Il. , § (L

Description

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The invention relates to automation and computing technology and can be used in devices outputting alphanumeric information and a cathode ray tube (CRT) screen,

The purpose of the invention is to expand the range of application due to the possibility of changing the background of the image at an arbitrary point in time.

FIG. 1 shows a block diagram of the device; in fig. 2 is a block diagram of the control unit.

The device contains the first 1 and second 2 memory blocks, the first register 3, a 4-character generator consisting of a block of permanent memory 5 and a raster line former 6, a video signal generation unit 7, a CRT 8, a control unit 9, And 10 elements groups, elements AND 11 of the second group, elements AND 12 of the third group, elements OR 13 of the group, second register 14, block 15 modulo-two adders, third register 16, first 17 and second 18 OR elements, informational inputs 19-21 of the device, control unit outputs 22-33, control unit input 34, informational inputs 35-36 devices.

The control unit includes a synchronization pulse generator 37, a counter 38 of the number of elements of the decomposition of characters along the X coordinate, a counter 39 of the number of characters in the lines of the displayed symbolic information, a counter 40 of the number of elements of decomposition of the symbols along the Y coordinate, a counter 41 of the number of lines of the displayed symbolic information, a decoder 42, permanently memorized, its device (ROM) 43 control microinstructions, outputs 44-78.

During the operation of the control unit 9, the generator of the synchronization pulses generates pulses that synchronize the operation of the entire device. From its output, the pulses arrive at the inputs of the modulation unit 7 (output 72) and the counter 38. The transfer pulses from the second output of the counter 38 arrive at the first input of the counter 39. The transfer pulses from the second output of the counter 40 arrive at the first input of the counter 41.

The status codes of the device from the first outputs of the counters 38 and 40 (you

52

moves 73 and 76), the second outputs of counters 39 and 41 (outputs 75 and 78) and the output of register 14 (input 34) are fed to the inputs of the decoder 42 connected to ROM 43.

Using the ROM 43, in which the microinstructor codes are written, the signals Record, Read, and Reset (outputs 44 - 58, 63, 70 and 71) of all

the main units of the device, lower case (exit 60) and personnel (exit 59) synchronizing pulses, signals for returning the beam in rows (output 61) and frames (output 62),

Pulses Ready to receive a code (output 64), carry pulses arriving at counter 40 from the counter

39 (output 65), and the reset pulses of the counters of block 9 (output 66).

Counters 39 and 41 form the addresses of the first memory block 1 (character memories) - outputs 74 and 77, counters

40 and 41 form the addresses of the second memory block 2 (raster memory) - outputs 76 and 77. Additionally, the addresses formed by the counters 39 and 40 are used to control blocks 5 and 6 of the 4-character generator (the codes

76 and 74),

From the outputs of the ROM 43, additional control pulses of the first 10, second 11 and third 12 groups of elements I are output (outputs 67 - 69).

The control unit 9 implements four basic modes of operation of the device.

The mode number that is currently being implemented is recorded from the information input 35 of the device to the register 14 at its first input. The reset of register 14 is effected by a signal from the information input 36 of the device each time when switching to a new mode of operation.

The device works as follows.

Through register 3, character codes in the exchange mode with the information system (input 19) are fed to the input of the first memory block 1. Here they are recorded in successive cells in the order of arrival at its input. According to the signals from the outputs of the control unit 9 in the mode of formation of the raster, they are selected from unit 1 and pass alternately through register 3 into the generator of 4 symbols.

3

From the code of the block 5 of the permanent memory, the codes corresponding to the lines of the raster of the television decomposition of characters are fed to the raster line shaper 6 and through it, the third group of elements 12 and the register 3, the module 15 modulo two - to the second block 2 of memory . At this moment, the third register 16 is reset, and the information from the output of register 3 to block 2 passes unchanged.

In the raster regeneration mode, information words of length K X m bits through register 3, the first group of elements AND 10 and the group of elements OR 13 come from block 2 to block 7 (K is the number of characters per line, m is the length of the line video code of one character).

At this time, the second group of elements And 11 signal from the output of block 9 is closed.

In block 7, the image is reproduced on a CRT screen.

With the help of groups of elements And 11 and 12 and the group of elements OR 13 the device implements the fourth mode of operation.

In this mode, using the third group of elements And 12, the connection between the output of the 4-character generator with register 3 and then with memory block 2 is broken.

With the help of the second group of elements AND 11 and the element OR 13, a direct link of the 4-character generator with block 7 is established to display the variable component of the images

Due to this, when simultaneously implementing the third and fourth modes, it is possible to combine the constant and variable components of the image. In block 1, information may change many times with the same content of block 2.

If necessary, change the background of the image with a pulse from the information input 21 of the device via WTO. The element OR 18 is cocked by the third register 16 according to its first platoon.

The signal from the output of the register 16 is fed to the second input of the block 15 modulo two adders.

As a result of the action of this signal, the signals coming from the fourth output of block 3 to block 2 are inverted. Inverting pr919554

It replaces zeros with ones, and ones with zeros.

The operation of block 15 continues until the register 16 is cleared. 5 The register 16 is reset by a pulse from the information input 20 of the device through the first element OR 17.

The W 16 register can be turned on and off at any time when this becomes necessary during the implementation of the raster shaping mode after v (to the next signals, the beginning of the line (output 60), the beginning of the frame (exit 59) and Ready to receive code (output 64).

A second variant of starting 20 of block 15 is possible through block 9 of control.

In this case, the mode code is modified in register 14, for example, at the expense of an extra bit, in which, in the case of a modification, one is written.

The modified raster shaping mode code translates the addresses of the ROM 43 into the cell area where microcommands with units in bits of 30 codes, which correspond to the outputs of ROM 70 and 71 and the second inputs of the first 17 and second 18 OR elements, are stored to register 16.

This allows, at the right moment 35, to load register 16 and to start block 15 or reset register 16 and to terminate block 15.

By changing the sign of modifying the mode code, for example, by repeated 40 entries in the flushed code register with the modifier sign equal to zero, you can proceed to performing the normal operating modes of the device.

Inverting codes allows 45 to change the background of the image and increase its informational content.

Background changes are made automatically by commands from the outputs of the information system. A part of the image on a CRT screen can be displayed with black symbols on a white background, the rest with white symbols on a black background.

Claims (1)

55 The invention A device for displaying information on a screen of a cathode ray tube (CRT), containing the first and second memory blocks, the first register. uh a symbol generator consisting of serially connected constant memory block and raster line imager, video signal shaping unit, control unit, three groups of AND elements, a group of OR elements, the second register whose inputs are information inputs of the device, the output is connected to the block input control, the first output of which is connected to the first input of the first memory block, the output of which is connected to the first input of the first register, the second input of which is one of the information inputs of the device, v The output of the control unit is connected to the first input of the second memory unit, the output of which is connected to the third input of the first register, the first output of which is connected to the first input of the permanent memory unit, the second input of which is connected to the third input of the control unit, the second input of the raster former lines connected to the fourth output of the control unit; output to the first inputs of the AND elements of the third group and the first inputs of the AND elements of the second group, the outputs of which are connected to the first inputs of the OR elements of the group, the outputs of the elements And the third group is connected to the fourth input of the first register, the second inputs - to the fifth output of the control unit, the sixth output of which is connected to the second inputs of the element) 0 919556 And the second group, the seventh output - with the first inputs of elements AND of the first group, the second inputs of which are connected to the second output of the first 5 register, the outputs - with the second inputs of the elements OR of the group, the outputs of which are connected to the first input of the video signal forming unit, the second input of which is connected with the eighth output of the control unit, the output with a CRT modulator, the ninth output of the control unit is connected to the fifth input of the first register, the third output of which is connected to the second input of the first memory unit, the tenth output of the control unit The output of the device, characterized in that, in order to expand the scope of application due to 20 changes in the background of the image at an arbitrary moment of time, a modulo-two adder block, a third register, the first and second elements OR, the first inputs of which are informational inputs of the device, the second inputs are connected respectively to the eleventh and twelfth outputs of the control unit, the outputs are respectively c. the first and second inputs of the third register, the output of which is connected to the first inputs of the block of modulo-adders, the outputs of which are connected to the second input of the second memory block, the second inputs to the fourth output of the first register. ..one 2ft 24 Compiled by G. Grinev Editor V. Danko Tehred V. Kadar Correction L. Patay Order 265/47 Circulation 673 Subscription VNIIPI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Design, And 2829 2