SU1529212A1 - Device for displaying information on tv receiver screen - Google Patents

Abstract

The invention relates to automation and computing and can be used to display information from a computer. The purpose of the invention is to expand the functionality of the device by increasing the set of displayed symbols and their color or halftone display — by introducing a second CRT controller, a digital-to-analog converter, a RAM, a signal switch, and corresponding functional connections. The invention makes it possible to increase the set of displayed symbols, as well as to highlight them in color while maintaining the flicker modes, underlining the negative image, etc. and high reliability of the device. 2 Il.

Description

The invention relates to automation and computing technology. It can also be used to display information from a computer.

The purpose of the invention is to expand the functionality of the device by increasing the set of displayed symbols and their color (1K) th or halftone display.

FIG. 1 shows a block diagram of the device; in fig. 2 is a block diagram of a signal switch.

The device contains a generator of 1 clock pulses, a divider 2 frequencies, a first controller of a CRT 3, a block 4 of a constant parameter, a shift register 5, a video signal generator 6, a second controller EL T 7. a digital-to-analog converter 8, a block of 9 memory, a switch 10, output 11 for connecting to a video input of a television indicator, controlling output 12, output 13 of a blocking signal for operational parameters, bus 14 dapng, bus 15 addresses, bus 16 control, shadows, control inputs 17, 18 of the switch, output 19 switch signals.

Switch 10 contains decator 20, element OR 21, trigger 22. first 23 and second 24 elements AND, address input 25, control input 26.

The device works as follows.

Nerve 3 and second 7 CRT controllers can be executed on K580VG 75 integrated circuits. After power is turned on, clock generator 1 synchronizes shift register 5 and, through frequency divider 2, first and second CRT controllers and shift register 5. A general reset of the blocks follows, in which the T-flip-flop 22 is reset, at output 13 (Fig. 2), "O, at output 19" 1 is set, which allows blocking the operational memory 9. When reset, the first and second CRT controllers are also set to the initial state of readiness for mode programming. Programming the counter, 1 teller of oscillation, is eight

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commands, each of which consists of a command code byte and zero to four bytes of parameters. Moreover, the first controller of the CRT 3 receives commands from the data bus, and the second controller of the CRT 7 from the RAM block 9, where the corresponding commands are preloaded.

To prepare for the display of information, it is necessary to record the first hours of character codes (record 1) in the screen area of the RAM of the microprocessor system and the second parts of the character codes (record 2), expanding the character set and their color (semitone) display, in block 9 memory The "Record 1 and" Record 2 processes are performed sequentially and always in pairs. After the "Record 1" process is completed, the T-flip-flop 22 tilts at the front of the signal at input 17. At its output, "1" appears, which provides a signal at output 13 that blocks the microprocessor system's working memory and simultaneously sets "O at the output 19, enabling operation of the RAM block 9. Thus, the device is prepared to perform the "Record 2" process, and after its execution, the T-flip-flop 22 tilts. At its output, the signal "O" appears. The write cycle is over, and the device is again ready for | a new code.

During the display, parallel reading of codes occurs from the “screen area of the RAM of the microprocessor system and from block 9 of the memory of the nerve and the second CRT controllers, respectively. The first controller of the CRT 3 forms the lower bits of the address of the block 4 of the permanent memory, from the output of which the character code is fed to the information inputs of the register 5 of the module. Last pre

forms the character code in a sequence of pulses, which, mixing in the video signal generator 6; 1a with the sync signals from the first CRT controller 3; enters output 11. The controller of the CRT 7 synchronously with the first acts on the higher inputs of block 4, expands the set of signals and controls the digital-to-analog converter 8, which generates the corresponding signals at output 12 (R, V, G, or ).

Thus, the device allows the character set to be expanded. In addition, the possibility of a color or black and white halftone display of symbols appears. At the same time, the capabilities of the CRT controller for programming character attributes and gender (flicker, underline, negative image, etc.) are preserved. The device has high reliability.

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Since the exit from line 9 of the RAM, the digital-to-analog converter 8, the second CRT controller will entail only the absence of; 1; e color mony-tone) symbol images.

Claims (1)

Invention Formula A device for displaying a) and - form: .and on the screen of a television set containing a first counter, a 1-beam cathode ray tube (CRT), a block of permanent memory, a shift register, a video driver, a frequency divider, a clock generator, the output of which is connected to the clock input of the shift register and the information input of the divider often, the output of which is connected to the first control input of the first CRT controller and to the control input d) of its shift input, the information input from which is single with output b; 10k post memory, the input of which is connected to the first first input of the first controller) and the CRT, the second output of which is connected to the digital video input signal controller input port, u1-: forma |; the input input D of which is connected to the output of the output register, the output of the video signal generator is the output of the device for connecting the television input to the video input of the television receiver, the second control and information inputs of the first CRT controller I. 1 are correspondingly controlled and the bus of this device, in order to have functional possibilities The device is enhanced by the increased I set of displayed characters and their color tone — a grayscale | - () display; it contains a second CRT controller. memory unit, switch. A digital converter, the output of which is the control output of the device sigal color, un) the inputs of the switch are connected to the control bus of the device, the address of the 1st input of the x-M-mutator is the address arranged., The first output; the switch is the output of the signal blocking block of the 1-th one of the device's onepaTiiB memory, the second output of the switch is connected to the RAM memory access address Bxo.aorvi, the write control input 1, the address and information inputs of which are connected respectively to the control bus, buses The e-addresses, the data input of the device, the output of the RAM unit are connected to the informational output of the second controller; the output counter of the CRT, the output of which is connected to the address input of the block of constant type and the information input of the analog-to-digital converter, the second and second CRT controller are connected respectively with the output of the divider part (, 1 and control-; 1, the device. Compiled by A. Korobov Editor About SureyTehred I. VeresKorrektor O. Tsiple Order 7642/44 Circulation 668 Subscription  State Committee on Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Raushsk nab., 45 Production and publishing combine “Patent, Uzhgorod, ul. Gagarin, 101 FIG. g