SU1524044A2 - Device for displaying information on crt screen - Google Patents

Abstract

This invention relates to automation and computing. The purpose of the invention is to expand the scope of use due to the possibility of erasing the image at a given point in time. This is achieved by introducing into the main device the fourth group 79 of elements AND, the binary counter 80, the comparator unit 81, the fourth 82 and the fifth 83 registers and the corresponding functional links. The invention allows erasing information at a predetermined time. 2 Il.

Description

The invention relates to automation and computing, can be used in devices for outputting alphanumeric and graphic information to a screen of a cathode ray tube (CRT) and is an improvement of the invention according to the author. W 1291956.

The purpose of the invention is to expand the scope of application due to the possibility of image rubbing at a given 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, the generator A of characters, block 5 of the permanent memory, shaper 6 raster line, block 7 of forming the video signal, CRT 8, block 9 of control, the first group of 10 elements And, the second a group of 11 elements And, a third group of 12 elements And, a group of 13 elements OR, a second register 14, a first group of 15 prohibition elements, a second group of 16 prohibition elements, a third register 17. The positions IS and 19 designate the information input and information output of the device, position mi 20-30 - outputs of control block 9, and position 31 - exit

block 9.

The control unit 9 contains a generator 32 and a synchronization file, a counter 33 of the number of elements of decomposition of characters in the X coordinate of 34 characters in lines of the displayed symbolic information, a counter 35 of the number of elements of decomposition of characters in the Y coordinate, a counter 36 of the number of lines of the displayed symbolic information, a decoder 37, permanently This memory (ROM) is 38 control words (microcommands).

The drawing also shows the outputs of 39-67 ROM of micro-commands, the output 68 of the generator of synchronization pulses, the outputs 69-74 of the counters of the control unit 9, the information inputs 75 and 76 of the device, the outputs 77 and 78 of the control unit 9.

The device contains the fourth line of the 79 elements And, the binary counter 80, the block 81 of the comparison, the fourth 82 and the fifth 83 registers. Reference numerals 84 and 85 designate the information input and output of the device.

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During operation of control unit 9, generator 32 generates pulses that synchronize the operation of the entire device,

From its output, pulses arrive at the inputs of block 7 (output 68) and counter 33. A pulse of transfers from the second output of counter 33 is fed to the first input of counter 34. The pulses of carries from the second output of counter 35 are fed to the first input of counter 36. Pulses of transfers from the third output counter 36 is fed to the input of the counter 80 (exit 77).

The status codes of the device from the outputs of counters 33-36 are received (output 78) at the second input of the comparator unit 81 as the lower bits of the current time codes, the second input of the unit 81 supplements its first input.

The status codes of the device from the first steps of the counters 33 and 35 (outputs 69 and 72), the second outputs of the counters 34 and 36 (inputs 71 and 74) and the output of register 14 (input 31) are fed to the inputs of the decoder 37 connected to the ROM 38 .

Using the ROM 38 in which the microinstructor codes are written, the Write, Read and Reset signals (outputs 39-53, 58, 65) are generated. of all the main units of the device, lower case (outputs 55) and personnel (outputs 54) are synchronized in the head. pulses, signals for returning the beam paths in rows (outputs 56) and frames (output 57), pulses Ready to receive code output 59, transfer pulses supplied to counter 35 from counter 34 (output 60), and reset pulses of counters of block 9 ( exit 61).

Counters 34 and 36 form the addresses of the first memory block I (outputs 70 and 73), counters 35 and 36 form the addresses of the second memory block 2 (outputs 72 and 73). In addition, the addresses generated by the FOR and 35 counters are used to control blocks 5 and 6 of the 4-character generator (outputs 70 and 72).

Control block 9 implements four basic modes of operation of the device and additional modes — erasing the image with a predetermined time delay.

The mode number that is currently being implemented is recorded from the output of the information system into register 14 (input 75) at its first input. Register 14 is reset by a signal from the information system via its second / input (input 76) every time it switches to a new mode of operation.

The device works as follows.

Through register 3 and the second group of 16 prohibition elements, the character codes in the exchange mode with the information system (input 18) 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 block 9 in the mode of forming the raster, they are selected from block 1 and pass alternately through register 3 into the generator of η symbols.

From the output of block 5 of the permanent memory, codes corresponding to the rows of the television arrangement of characters enter the raster line generator 6 and through it, the third group of 12 elements I and the register 3, the first group of 15 elements are prohibited in the second memory block 2.

At this moment, register 17 is cleared and the information through the prohibition circuit groups into the memory blocks passes unchanged, since at their prohibiting inputs the signals coming from the outputs of register 17 are equal to zero.

In the raster regeneration mode, information words with the length kV m of bits through the register 3, the first group of 10 elements AND, the group 13 of the EL or OR arrive in the signal formation unit 7. Here k is the number of characters in the crpoch outputs of the ROM 66 and 67, connected ke, m is the length of the lowercase code for one to the second input of the register 17. Reset

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Due to this, with the simultaneous implementation of 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 it is necessary to erase the image on the CRT screen, the device is transferred to an additional erasing mode, which is realized by commands from the information system output, arriving at the first input of the registry 14 through input 75 in the form of signs of modifying the codes of the main modes - additional units to the codes and recording information system in the register 82 values of the time interval, during which the image will remain on the screen without changes (erase delay values).

The basic parts of the mode codes re5 are given from the first output of block 14 to the input of the block, 9 unchanged (input 31). Signs of modification are received from the second output of block 4 of the first input of block 79, the second input of which is controlled by the output of register 83. The signs of modification to the input of the decoder of status codes of device 37 through block 79 are passed only after the output of the fifth register 83 unit is set .. After this, block 79 will open and the addresses of the ROM 38 will switch to the cell area, where the hragg mc is a micro-command with units in the code bits that correspond to 5

symbol. At this time, the second group of 1I elements And the signal from the output of block 9 is closed.

In block 8, the image is reproduced on a CRT screen. With the help of groups II and 12 elements AND, and group 13 elements OR, the device implements the fourth mode of register 17 is automatically completed by erasing the signal from the output 65 of the 3S ROM connected 5 to its first input.

When erasing, zeros from the outputs of the first or second groups of prohibition elements are automatically recorded in the memory cells without a beta. In this mode, with the help of the third information system1 1. During group ST-12 elements and tears up the wounds, the system can perform another

work

The start of the erase is determined by the processes occurring in the counter 80 and the comparison unit 81.

Counter 80 is a component

connection of the output of the generator of 4 symbols with the register 3 and further with the memory block 2.

Using the second group 11 of the elements AND and the group 13 of the elements of the history, the direct connection of the 4-character generator to the block 7 is established to display the variable component of the image.

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the electronic clock of the current time, the circuit of which includes a chain made up of the generator 32, the register 17 is automatically completed by erasing the signal from the output 65 of the ROM 3S connected 5 to its first input.

When erasing, zeros are automatically recorded from the outputs of the first or second groups of elements.

an electronic clock of the current time, the circuit of which includes a chain made up of generator 32, counters 33 and 34, decoder 37, ROM 38, counters 35 and 36 of control unit 9 and counter 80, which takes into account the number of transfers from counter 36, i.e. in fact, the number of frames.

Codes from the output of the counter 80 arrive at the first input 81 as compared to the older part of the current time codes. The low bits of the current time codes from the fourteenth output of block 9 (output 78) to the second input of the comparison circuit. The value of the time interval, the postulate in register 82 and the information system (input 84), goes to the third input of block 81. The result of the comparison from the output of block 81 is entered into block 83, after which the actions leading to erasure begin erasing information in blocks 1 or 2 individually or together, depending on the need).

The recording of the displacement s block 82 is synchronized in the information system with the pulses of Totov, the beginning of the frame and the 11th line on the beginning of erasing the information a. the system judges by comparison at output 85. According to the process control, it produces a reset: 82 and 83 pulses from the output of the information system at input 76,

Claims (1)

Invention Formula A device for displaying information on the screen of a cathode ray tube (CRT) according to the author. St. No. 1291956, which is related to the fact that, in order to expand the field of application of the device due to the possibility of changing the displayed information at a given point in time, the fourth group of elements AND, the fourth and fifth registers, the comparison unit and the binary counter are entered into it. whose clock input is connected to the thirteenth output of the control unit, and the output to the first information output of the comparison unit, the second information input of which is connected to the fourteenth output of the control unit, and the output connected to the information input of the Istra, the third information input of the comparison unit is connected to the output of the fourth register, the information input of which is the fourth information input of the device, and the control (the input is connected to the second control with 1 UI input of the second register and, p. 1 avl to 1 input n of the register, the output of which is the income of the device and connected to the first inputs of the elements of the fourth group, whose second inputs are connected to the second output of the second register, and the output to the input of the control unit. 2Q g; 21 23 24 25 26 27 28 29 30