RU1824633C - Device for displaying information from personal computer on tv screen - Google Patents

Abstract

Usage: the field of computer technology, in devices for the formation of computer images on color and monochromatic (black and white) displays, can be used in industrially produced household computers. Summary of the invention: the device comprises a display controller, a character generator 2, a shift register 3, an adder 4, AND elements 6, 7, 8, 9, an operating mode switch 10. 2 ill.

Description

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The invention relates to the field of computer engineering, in particular to computer image forming devices on color and monochromatic (black and white) displays, and can be used in commercially available household computers.

The purpose of the invention is to expand the operational capabilities of the device.

In FIG. 1 shows a structural diagram of the proposed device; Fig. 2 is an exemplary embodiment of a mode switch.

The device comprises a display controller 1 with a bus input a, an output of clock pulses n, attribute inputs b, d, c and a bus output for generating a video signal f, a character generator 2. shift register 3, adder 4, with output 5.

The device also contains elements And 6-9 and a switch 10 modes of operation.

The switch 10 contains transistors 11 and 12, resistors 13 and 14, a capacitor 15 and diodes 16. 17 and 18.

Transistor 11 opens if there is at least one color signal on R-. G-, B-outs. and therefore, the voltage across capacitor 15. In this case, the voltage at the collector of transistor 11 drops, and the black-and-white video signal is disconnected from output 5. The emitter follower on transistor 12 serves to increase the input resistance of the switch.

The device operates as follows.

When the black-and-white program is operating from the side of the bus input a, no attributive commands are received, therefore, at the outputs b, d, c no high-level signals are generated, which means that the signals R, G, B are at the outputs of elements And 6-9. At the same time, regardless of the type of program, a clock pulse is generated at the sync input n of controller 1, which passes through an adder 4 to output 5, which is supplied to the sync-speed input of a color TV (not shown in the drawing). At the bus output f of the controller 1, commands are generated for the formation of symbols recorded in the character generator 2. The resulting symbols are laid out on television lines in the shift register 3 and are fed by video signals to the inputs of elements And 6-9. Since there are no R, G, B-signals, a high level voltage is generated at the output of the switch 10, and the video signal fed to the second input of the 9 And element passes to its output and to the second input of the adder 4, where it is mixed with clock pulses and fed to the color channel of the color TV, image in black and white.

During the operation of the color program, the formation of clock pulses at the output and video signals at the output of register 3 will not change. However, when sequentially or simultaneously receives attributive commands used as color commands, high-level signals are produced at outputs b, d, c, which color the black-and-white video signal, since the outputs R, G, B are supplied respectively to red, green and the blue rays of a CRT color TV. At

5, the presence of signals at the input of the switch 10 leads to the fact that a low-level signal is generated at its output, which disconnects the black-and-white video signal from the adder 4 (it does not pass to the output of element 9)

0 thanks to this, the black and white video signal does not distort the color purity of the color image, and the clock pulses arrive at the TV synchronizer channel.

Enable or disable process

5, the black-and-white video signal from the input of the adder 4 occurs automatically depending on the presence in the program of the color commands received at the input of controller 1. That is, the color or black-and-white program runs on the computer. To reproduce the color image, a program is used in which instructions are additionally entered for generating color signals.

Claims (1)

5 The proposed device will make it possible to create a new type of home computer combining color and black and white images, which will provide the ability to view both black and white programs previously created for black and white home computers and new, color ones designed for digital computers with the inventive device, it is possible to view color programs on black and white home computers in a black and white image. SUMMARY OF THE INVENTION A device for outputting information from a personal computer to a television receiver screen, comprising a display controller, the input of which is the input of the device, and the group outputs are connected to the inputs of the character generator, the outputs of which are connected to the inputs of the shift register, and 5 an adder, the first input of which is connected to the first output of the display controller, characterized in that, in order to expand the operational capabilities of the device, it contains four AND elements and a mode switch. the inputs of which are connected to the outputs from the first to third elements AND, which are the outputs of the color components of the video signal of the device, the output of the mode switch is connected to the first input of the fourth element I. the output of which is connected to the second input of the adder. first inputs from the first to the third element And are connected respectively to the second, third and fourth outputs of the display controller, the second inputs of which and the second input of the fourth AND element are connected to the output of the shift register, the output of the adder is the output of the black-and-white video signal and clock pulses of the device. tog I16 V / x & V-11  8shV 718 Come out fifteen - FIG 2