SU1288750A1 - Device for displaying information on screen of cathode-ray tube (crt) - Google Patents

Abstract

The invention relates to the field of computer technology and can be used for dialogue of an operator with a computer and displaying symbol-graphic information. The purpose of the invention is to expand the field of application of the device due to the possibility of displaying both symbolic and graphical information, which is achieved by introducing control triggers and mode, second AND element, mode switch, row decoder, shift register, buffer memory block, multiplexer, block comparing NRL and a counter and corresponding functional relationships. The device, with its considerably simple design, allows displaying character and graphic information on a CRT screen. 1 il. b (L'e 00 sd

Description

112

The invention relates to computing and can be used for dialogue of an operator with a computer and displaying character-graphic information.

The purpose of the invention is to expand the field of application of the device by increasing the resolution when displaying a one-dimensional function.

The drawing shows the functional diagram of the device.

The device contains a trigger 1 re

press, second element AND 2, 3 line decoder, control trigger 4, mode switch 5, character generator 6, code converter 7, memory block 8, buffer memory block 9, multiplexer 10, comparison block 11, address switch 12, counter 13 - addresses, the first element And 14, the shift register 15, the first 16 and the second 17 pulse counters, the master oscillator 18, the counter 19 characters per line, the counter 20 television lines, the counter 21 significant lines, the generator 22 horizontal scanning, generator 23 frame scan and electron beam tube (CRT) 24.

The device works as follows.

When turned on, the device is reset and operates in the display mode of symbolic information. When a signal arrives from the computer, the trigger schedule 1 of the mode is translated into one state and prepares the control trigger 4 for switching on, which is translated into one state (the corresponding graph display) through the AND 2 element by a zero line sign signal from the 3 line decoder. The decoder 3 decrypts the information received from the counter 21 characters of the lines, which is controlled by the counter 20 TV lines. Trigger 4 is the main control of the modes of the graphic-symbol from the zero-character line up to (p-1) -th inclusively. I affect the mode switch 5, allows the signals of the comparison block I1 to pass to the modulator (video input) of the CRT 24. Trigger 4 the mode is turned off by the signal of the nth sign line from the decoder 3 and switches the device to the character display mode from the nth sign line to the end of the frame, allowing passage to the CRT 24 video input

five

0

five

0

signals from character generator 6 through the converter 7 codes and switch 5.

The codes of the displayed curves and the signatures jceA to them are stored in memory block B, previously recorded from a computer. In order to coordinate the sampling time of information from the memory block 8, with a forward scan of the horizontal scan rfy4a (when two or more graphs are displayed), a buffer memory block 9 is inserted, containing w 8c times. regular registers. The information is recorded in block 9 of memory block .8 during the return run of the horizontal raevortka ray of each television line. Controls the write in block 9 of the M-bit shift register 15, synchronously changing, through the AND 14 element, the state of the address 13 counter, which through the address switch 12. selects information from the memory block 8, i

Shift register 15 is controlled by a counter overflow signal of 19 characters per line.

During the return path of the beam of each TV line counters

16 and 17 pulses are zeroed by the overflow signal of counter 19. Synchronously with the beginning of each television line 1 at the input of counter 17 pulses (the position of the beam on the screen)

pulses are generated from driver generator 18, which are counted by a counter. The comparison unit 11 receives the current value of the counter 17 and through the multiplexer 10, controlled by the pulse counter 16 (selection of the graph number), information from the first register of block 9. When equality of the compared codes of the counter L7 and the first register of block 9 is reached, the comparison block 11 generates a pulse that is fed through the switch 5 to the video input of the CRT 24, and the first point of the first graph is displayed on the screen.

B current sweep each TV line to the input of the counter

17, clock pulses from master oscillator 18 are continuously supplied, and when counter 17 overflows, pulses are output, counted by counter 16 (selection of the graph number). The counter 16, controlled by the multiplexer 10, connects to the comparison unit 11 the second register of the block 9, and the display cycle of the first point of the second graph

0

five

0

five

3, 1288750

mc, etc. until the end of the TV line, after which the block 9 of the new information of the memory block 8 on the second displayed graphs occurs.

The display line displayed points grat .d. to P-1-st sign scribal.

The sign string is translated to the end of the device by decryption3, having dropped trigger 4 pk, to the character mode, and on CRT 24 signatures are highlighted.

fO

15

n in x with t p p d d t y i u h a hell not you kore u p m s u r u m u m o u m o u m o m o u m i n i s i v m ne s b t i n t u w o d o d s m me ve

Thus, the number of points in each graph is equal to the number of television lines from the zero-digit line to n-1 inclusive, the abscissa axis is arranged vertically, and the ordinate axis is horizontal and the n output points of the graphs are displayed on it. The accuracy of the reproduced graphs depends on the width of the registers of block 9, the number of their dimensions of the television line (tube),

Claims (1)

Invention Formula A device for displaying information on a cathode-ray tube (CRT) screen containing a serially connected master oscillator, a character counter in a line, and a horizontal scanning generator, serially connected TV-line counters, a sign counter for character lines and a frame sweep generator, the first And element, the first input of which is connected to the output of the master oscillator, an address switch connected in series, a memory block, a character generator. and a code converter, the first pulse counter, the first input of which is connected to the output of the master oscillator, and the second input - to the output of the character counter in the line, is connected to the O 15 0 five 0 5 0 5 Connected to the first input of the address switch, the second input of which is connected to the output of the character row counter, the outputs of the horizontal and vertical scan generators are connected to a deflecting CRT system, characterized in that, in order to expand the application area of the device by increasing the resolution when displaying a one-dimensional function it is so holds the sequentially connected trigger, whose inputs are the Graph and Reset inputs, the second AND element, the control trigger and the mode switch, the second input of which is connected to the output of the code converter, and the output to the CRT modulator, the address counter, the first input of which connected to the output of the first element I, and the outputs to the third and fourth inputs of the address switch, the fifth input of which and the second input of the address counter are connected to the output of the control trigger, the shift register, the second counter pulse , a row decoder and serially connected register, the first input of which is connected to the output of the memory unit, the second input - to the output of the shift register associated with the second input of the first And element, the multiplexer, the second input of which is connected to the output of the second pulse counter, and the comparison unit whose second input is connected to the output of the first pulse counter, and the output to the third input of the mode switch, the first input of the shift register is connected to the output of the master oscillator, and the second input is connected to the output of the character counter in the row, connected the first input of the second pulse counter, whose second input is connected to the output of the first pulse counter, the input row decoder connected to the output of the counter iconic lines, and its outputs - to the second inputs of the second AND gate and a control flip-flop, respectively.  1 l 1 (i  I I / Gd EVM pt Mr j I  9 / g // L. f crJ / r 77 I I L "i   / V G 1  76 f E  crin NO / 7 I- f 15 -, - I r G 1  76 f E  crin and / 7 i- / Editor V.Petrash Compiled by S. Grishin Tehred V.Kadar Proofreader T.Kolb Order 7814/50 TiipaK 453. Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4