SU1291956A1 - 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 and graphic information on a screen of a cathode ray tube. The purpose of the invention is to increase the speed of the device. The device contains two memory blocks, three registers, a symbol generator consisting of a block of permanent memory and a raster line former, a video signal shaping unit, a control unit, three groups of AND elements, a group of OR elements, two groups of prohibition elements. The introduction of a third register and two groups of prohibition elements leads to an increase in the speed of the device due to the possibility of erasing the image automatically with a single command to the information input of the device. 2 Il. with S (L tc has co

Description

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The invention relates to automation and computer technology and can be used in devices for outputting alphanumeric and graphic information to the screen of a cathode ray tube.

The purpose of the invention is to increase the speed of the device.

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 blocks of memory, the first register 3, the generator of 4 characters consisting of block 5 of the permanent memory and the former 6 of the raster line, block 7 of forming the video signal, CRT 8, block 9 of control, elements (And 10 the first group, and 11 of the second group, and 12 of the third group, the elements of OR 13 group, the second register 14. The prohibition elements 15 of the first group, the prohibition elements 16 of the second group, the third register 17, the information input 18 of the device, the outputs 19-30 of the control unit, control unit input 31.

The control unit contains a generator of 32 synchronization pulses, a counter 33 of the number of decomposition elements with a symbol along the X coordinate, a counter 34 of the number of characters in the rows of displayed symbolic information, a counter 35 of the number of decomposition elements of symbols along the Y coordinate, a counter 36 of the number of rows of the displayed symbolic information, decoder 37, constant This storage device (ROM) of 38 control microinstructions, outputs 39–74.

During operation of the control unit 9, the generator of the synchronization pulses 32 produces pulses that synchronize the operation of the entire device. From its output, the pulses are fed to the inputs of block 7 (output 68) and counters 33. The pulses from the second output of counter 33 arrive at the first input of counter 34. The pulses from the second output of counter 35 arrive at the first input of counter 36

The status codes of the device from the first outputs of counters 33 and 35 (outputs 69 and 72), the second outputs of counters 34 and 36 (outputs 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.

five

956. 2

Using the ROM 38, in which the microinstructor codes are written, the Record, Read and Reset signals (outputs 39-53, 58, 65) of all the main units of the device, lower-case (outputs 55) and frame (outputs 54) clock pulses, reverse signals beam paths in rows (outputs 56) and frames (output 57), pulses Ready to receive a code (exit 59), carry pulses arriving at counter 35 from counter 34 (exit 60), and reset pulses of block counters 9 (exit 61) .

Counters 34 and 36 form addresses. . the first memory block 1 (symbol memory) —ends 70 and 73, counters 35 and 36 form the addresses of the second memory block 2 (raster memory) —outsides 72 and 73. Additionally, the addresses generated by counters 34 and 35 are used to control blocks 5 and 6 of the generator 4 characters (outputs 5 Dy 70 and 72).

From the outputs of the ROM 38, additional control pulses of the first 10, second 11 and third 12 groups of elements AND (outputs 62–64) and Q pulse are output. They control the third register (outputs 66 and 67).

The control unit 9 implements four basic modes of operation of the device and an additional mode of erasing images.

The mode number that is currently being implemented is recorded from the information input 75 of the device to the register 14 at its first Q input. The reset of register 14 is effected by a signal from the information input 76 of the device at its second input each time it switches to a new mode of operation.

The device works as follows.

35

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in a way.

Through registers 3, 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 written into successive cells in the order of arrival at its input. According to the signals from the outputs of the control block 9 in the raster generation mode, they are selected from block 1 and pass alternately through register 3 into the generator 4 of the 4 drives.

3

From the output of block 5 of the permanent memory, codes corresponding to the raster lines of the television decomposition of symbols are sent to the raster line shaper 6 and through it, the third group of elements 12 and the register 3, the first group of prohibition elements 75 to the second memory block 2 At this moment the register 17 is cleared, and the information through the groups of prohibition circuits in the memory blocks passes unchanged, since at their second prohibiting inputs the signals from the outputs of register 17 are zero.

In the raster regeneration mode, informational words K x m bi in length through register 3, the first group of elements AND 10 and the group of elements OR 13 enter block 7 (K is the number of characters in a line, m is the length of the outside 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 8, the image is displayed on the screen. CRT.

With the help of groups of elements And 11, 12 and groups of elements OR 13 mouth

The fourth mode of operation is implemented.

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 OR elements 13, the direct connection of the 4-character generator with block 7 is established. to display the variable component of the images. 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 the additional mode of erasing the image, which is realized by commands from the information input 75 of the device, which enters the input of the register 14 in the form of signs of modification of the main mode numbers (additional code bits).

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0

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The modified codes of the main mode numbers translate the addresses of the ROM 38 into the area of the cells where microcommands with units in the code bits are stored, which correspond to the ROM outputs connected via outputs 66 and 67 to the second register input 17. The register 17 is reset from the ROM output connected to its first input via output 65.

This allows one or both register 1 7 triggers at the right moment and prohibits signals from their output from passing codes through the first or second groups of prohibition elements or both at once, depending on what is erased — the contents of the first memory block, the contents the second memory block or both blocks simultaneously. Erasing of images is performed by erasing the contained memory blocks. In this case, the zeroes from the outputs of the first and second groups of prohibition elements are automatically recorded into memory cells (in the first mode in block 1, in the second in block 2, or in blocks 1 and 2 at the same time). In order to perform an erase, one command from the information system is enough. During erasure, the information system may perform other work that is not related to ensuring erasing of the image in the information display device using the time obtained from reducing the information exchange time.

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Formula inventions

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A device for displaying information on the screen of a cathode-ray tube (CRT), containing the first and second memory blocks, the first register, a symbol generator consisting of serially connected fixed memory blocks and a raster line former, a video signal shaping unit, a control unit, three groups of elements AND, a group of elements OR, the second register whose inputs are the information inputs of the device, the output is connected to the input of the control unit, the first output of which is connected to the first input of the first memory block and.

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, the second output of the control unit is connected to the first input of the second memory block, 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 block a fixed memory, the second input of which is connected to the third output of the control unit, the second input of the raster line generator is connected to the fourth output of the control unit, the output to the first inputs of the elements, And the third the first group and the first inputs of AND gates of the second group, the outputs of which are connected to first inputs of the OR elements of the group of elements and outputs of the third group are connected to a fourth input of the first register, the second input - to. the fifth output of the control unit, the sixth output of which is connected to the second inputs of the elements of the second group and the seventh output to the first inputs of the elements of the first group, the second inputs of which are connected to the second output of the first register, the outputs

the second inputs; OR elements whose outputs are connected to the first input of the video signal conditioning unit, the second input of which is connected to the eighth output of the control unit, the output to the CRT modulator, the ninth output of the control unit is connected to the fifth input of the first register, first block memory tenth

The output of the control unit is the output of the device, characterized in that, in order to increase the speed of the device, the first and second groups of prohibition elements are entered into it, the third register, the outputs of which are connected to the eleventh and twelfth stages of the control unit, the first output with the first input . The prohibition elements of the second group, the second inputs of which are connected to the third output of the first register, the outputs to the second input of the first memory block, the fourth output of the first register connected to the first inputs of the prohibition elements of the first group, the second inputs of which are connected to the second output of the third register, and outputs - with the second input of the second unit

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figure 1

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FIG. 2

Claims (1)

Claim A device for displaying information on the screen of a cathode ray tube (CRT) containing the first and second memory blocks, a first register, a symbol generator consisting of a series-connected read-only memory block and a raster line generator, a video signal generation unit, a control unit, three groups of AND elements , a group of OR elements, a second register, the inputs of which are information inputs of the device, the output is connected to the input of the control unit, the first output of which is connected to the first input of the first memory unit, 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, the second 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 constant block memory, the second input of which is connected to the third output of the control unit, the second input of the raster line generator is connected to the fourth output of the control unit, the output - to the first inputs of elements And the third UPPA 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 AND elements of the third group are 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 AND elements groups, the seventh output - with the first inputs of AND elements of the first group, the second inputs of which are connected to the second output of the first register, the outputs with the second inputs of the elements OR groups, the outputs of which are connected to the first input of the ph video signal, the second input of which is connected to the eighth output of the control unit, the output to the CRT modulator, the ninth output of the control unit is connected to the fifth input of the first register, the first memory unit, the tenth output of the control unit is the device output, characterized in that, for the purpose of To increase the speed of the device, the first and second groups of prohibition elements are entered into it, the third register, the outputs of which are connected to the eleventh and twelfth outputs of the control unit, the first output - with the first inputs. the second group of inputs, the second inputs of which are connected to the third output of the first register, the outputs to the second input of the first memory block, the fourth output of the first register is connected to the first inputs of the 5 inhibit elements of the first group, the second inputs of which are connected to the second output of the third register , and outputs - with the second input of the second memory block. 30 | *