SU1372351A1 - Device for displaying information on cathode-ray tube screen - Google Patents

Abstract

The invention relates to the field of computer technology and can be used to output alphanumeric data from a computer. The purpose of the invention is to increase the speed of the device. The device contains a pulse generator 1, a counter 2, an address shaping unit 3, multiplexers 4, 12, a random-access memory block 5, blocks of permanent memory 6, 7, registers 11, 14, a signal generator 9, a video signal conditioner 13, a television receiver 10, a synchronization unit 8 with the appropriate links. Improving the speed is provided by the ability to change the sequence of output lines, for which the second register 14 is entered control code that determines the operation of the second block of permanent memory 7, which, controlled by the addresses of reading words from the memory block 5, changes the sequence of output lines by screen television receiver 10. 1 Il. § SL

Description

The invention relates to computer technology and can be used to output alphanumeric data from a computer.

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

The drawing shows a block diagram of a device.

The device comprises a pulse generator 1, a counter 2, an address generation unit 3, a first multiplexer 4, a random access memory unit 5, a first 6 and a second 7 read-only memory blocks, a synchronization unit 8, a blanking signal generator 15 9, a television receiver 10, a first register 11, the second multiplexer 12, the shaper 13 of the video signal, the second register 14 and bus 15-20. 20

The device operates as follows.

To form an image on the screen of the television receiver 10 that displays information stored in the RAM unit 5, it is necessary to control the brightness of the kinescope electron beam in strict accordance with its position on the raster and the reproduced information.

The position of the beam on the raster is completely determined by the state of the counter 2. The counting input of the counter 2 receives pulses from the pulse generator 1. The pulse frequency of the pulse generator 1 is selected based on the required dimensions of the decomposition element.

For the backward stroke of the electron beam of the kinescope along the line in each character string, there is a certain number of non-displayed characters, and for the backward movement of the electron beam over the frame in each there is a certain number of non-displayed character strings.

‘The blanking signal generator 9 generates signals providing blanking of the corresponding symbol positions, i.e. places the displayed information array on the screen of the television receiver 10. The blanking signal generator 9 stores the codes of the position numbers of the symbols in a strobe sync pulse, which provide tight raster synchronization and stillness of the image on the screen of the television receiver 10.

Consider the operation of the device in the information display mode.

For the symbolic output of information from the RAM unit 5 to the 10 screen of the television receiver 10, the address generation unit 3 cyclically generates a sequence of address codes of the displayed characters, which through the first multiplexer 4 go to the address inputs of the RAM unit 5, which is in the Read mode. From the output of the random access memory block, the code of the displayed symbol goes to the second input of the first block 6 of read-only memory. At the first input of the first block 6 of permanent memory from the first output of the counter 2 receives the code number of the displayed line in familiarity.

Under the influence of the incoming signals, the first block of read-only memory generates pulse code components corresponding to the displayed character string in the parallel code output

ZS binaries of backlight words that are received at the first input of the second multiplexer 12. The second multiplexer 12, by signals from the output of counter 2, converts the received 35 pulse code combination from parallel form to serial (video signal) synchronously with the raster scan.

The received video signal is supplied 40 to the third input of the video signal shaper 13, the first and second inputs of which respectively receive frame and horizontal sync pulses from the outputs of block 8 synchronization. The video signal generator 13 generates a complete video signal input to the video input of the television * receiver 10 to control the intensity of the kinescope electron beam and provide raster synchronization.

Consider the process of generating the address code of the displayed character.

Typically, the address code of the displayed character is determined by the state of the counter in which the beam is extinguished, and the codes of the non-displayed character strings.

Block 8 synchronization on the leading edge of the quenching pulses generates a horizontal sync pulse and frame chic 2 as the position of the character in the line and the line number of characters. In this case, all lines of characters (from zero to kth) are output sequentially. J5 of the proposed device, the address code of the displayed symbol is determined not only by the position in the line and line number, but also depends on the information stored in the second block 7 of constant memory and the code recorded in the second register 14. All versions of the sequences of output lines of characters are encoded in the second block 7 of constant memory. The current version of the string output sequence is determined by the code written in the second register 14.

To shift lines instead of overwriting the contents of the entire block 5 of RAM, it is enough to just change the contents of the second register 14.

Download of the second register 14 is carried out by supplying data to the input bus 16, and on the bus 19 - the load signal of the second register 14, by which the data is recorded in the second register 14. After the download of the second register 14 is completed, the download signal from the bus 19 and the data from the input bus 16 are removed.

Download block 5 RAM codes displayed characters is as follows. On the address bus 15, the code of the address of the memory cell is set, on which the code of the displayed symbol is to be written, and on the bus 17 a boot signal is issued, on which the first multiplexer 4 is switched, the address inputs of the RAM block 5 are connected to the address tin 15, and information from the input data bus 16 is written into memory.

After the download is complete, the download signal is removed from the bus and the device enters the display mode of the information.

To control the information displayed, you can read the contents of block 5 of RAM. To do this, the address of the readable memory cell is set on the address bus 15 and a read signal is inserted on the read bus I8, through which the first multiplexer 4 connects the address bus 15 to the address inputs of the RAM block 5, the first register 11 is activated, and the character code appears on the output data bus 20 . After removing the signal from the read bus, the device enters the information display mode.

In the proposed device increases the speed of the device in the bias mode of information, i.e. it is possible to change the sequence of outputting character strings to the television screen without changing the contents of the buffer memory.

Claims (1)

Claim A device for displaying information on the screen of a television receiver containing a pulse generator, the output of which is connected to the counter input of the counter, the first output of which is connected to the first address input of the first block of read-only memory, the second output of the counter is connected to the first information input of the blanking signal generator and the first information input of the block the formation of the address, the output of which is connected to the first information input of the first multiplexer, the output of which is connected to the address input of the opera block memory, the output of which is connected to the information input of the first register and the second address input of the first block of permanent memory, the third output of the counter is connected to the first control input of the second multiplexer, the information input of which is connected to the output of the first block of permanent memory, the second control input of the second multiplexer is connected to the first the output of the blanking signal driver, the second and third outputs of which are connected to the control inputs of the synchronization unit, the outputs of which are connected to the first and oromu the clock shaper video information whose input is connected to the output of the second multiplexer, the output video signal shaper is connected to the video input of a television receiver, a fourth counter output Cpd nen with the second information input of the blanking signal generator, the second information input of the first multiplexer is the first address input of the device, the second information input of which is the information input of the random access memory block, the control input of which and the first control input of the first multiplexer are the third control input of the device, fourth unitary enterprise) 372351 the equalizing input of which is the second control input of the first multiplexer, connected to the control input of the first register, which is the output of the device, characterized in that, in order to increase the speed of the device, it contains a second permanent memory unit and a second register, 10 the information input of which is connected to the second information input of the device, the control input of the second register is the fifth control input of the device, the output of the second register is connected to the first address input of the second block of read-only memory, the second address input of which is connected to the fourth output of the counter, and the output of the second block of read-only memory from of the connections to the second data input unit for generating addresses.