SU438032A1 - Device for displaying information - Google Patents

Description

(54) DEVICE FOR DISPLAYING INFORMATION

The invention relates to the field of automation and computer technology and can be used as a display device for information coming from a computer and for entering information into a computer.

Information display devices are known that contain a serially connected memory unit, a synchronization unit, a cathode ray tube, a light pen, a control unit connected to the synchronization unit, and an address unit connected to the memory unit.

However, the known devices are complex, have high clock frequencies and a large amount of memory.

The purpose of the invention is to simplify the device.

This is achieved by the fact that the proposed device contains successively connected buffer registers, one of which is connected to a memory unit and a control unit, and an OR circuit connected to a cathode ray tube.

The drawing shows a block diagram of the proposed device.

In the proposed device, the information recorded in the operative recording device (RAM) 1 is rewritten into the external memory (RAM) 2. RAM 1 and RAM 2 form a memory block. Gateway 2 is connected to the modulation unit 3 and the addressing unit 4, as well as to the synchronization unit 5. The CRT 6 is controlled by the synchronization unit 5, and the trigger pulses are sent to the control unit 7 connected to the addressing unit 4 by the modulation unit 3, with a light pen 8. The modulation unit is also connected to the CRT 6. The modulation unit 3 consists of a buffer register 9 divided into tetrads, a buffer register 10, the “OR 11, output

which controls the modulation of the beam on the screen.

Address unit 4 consists of an address register 12 and an address counter 13 connected to a comparison circuit 14. An address register 12 is connected to an OVC 2, an address counter 13 to an output of a control unit 7, and a comparison circuit 14 to its input.

The device has independent modes “Input and“ | Output.

In the Output mode, the device operates as follows.

At the beginning of the quench impulse from the synchronization unit 5, a pulse arrives at the control unit 7, which is sent by the first

request to OVC 2 for the first word containing the address of this word on the screen of the CRT 6 and the information part. This word is entered into modulation 3 and address 4 blocks to control the beam modulation when the addresses first match. Simultaneously carried out

Request the next (second) word. At the end of the frame blanking pulse, the word counting begins (the position of the beam on the CRT 6 screen), and when the addresses first match, the address unit 4 outputs a signal to the control unit 7, which in turn enables beam modulation. At the same time, a command is sent to select the next word. The control unit 7, which provides the above-mentioned sequence and launch of the circuit for modulation, with the beginning of the frame forces the selection, and during the return stroke after the end of the frame returns the circuit to its initial state (reset of registers, counters).

In the “Input” mode, the pulse of the light pen 8 comes from the control unit 7 to the address block 4 at the moment of the beam passing under the light pen and stops word counting. The address block 4 determines the address of the input word, and the position of the information point is determined by the modulation block 3. At the end of the frame, the old address stored in the address block 4 is compared with the new one, and if they differ, it is entered in the OVC 2. in the case of equality of addresses, information is accumulated in the modulation unit 3. The device uses a system of registers to expand the frequency range. Modulation occurs not by shifting information, but by reading the contents of register 10 with a sequence of gating pulses. To transfer information to the buffer register 10 from the buffer register 9, tetrad transfer is used, in fact, the first half of the buffer register 10 is a continuation of a row of even tetrads of the buffer register 9, and the second is a row of odd tetrads; The transfer of the tetrads, as well as the entry of information into the register 10 and its reading to modulate the beam, alternate, i.e., when reading the odd tetrads, the even numbers are transferred, and one of them is entered into the register 10, and vice versa. After entering into the register 10 of the last two tetrads, the buffer register 9 is free, and a new information word is entered into it from the OVC 2. This ensures uninterrupted reading of information.

The device also has a second mode of operation, which allows the report to be changed horizontally and vertically. Often, due to the geometry of the screen and the significant cycle of accessing the machine’s RAM, the horizontal resolution is much worse than the vertical resolution. This resolution can be changed using the synchronization block 5. The second line frequency is rebuilt by 30,000 HZ, and its dividers are by 6x4x5x5. As a result of such a sweep, the two half-frames have exactly the same appearance. In addition, the "internal image in memory is also defined in the definition) But in order: first, all the words that have even addresses are recorded, and then the words that have odd addresses. As a result, the circulation pulses in the OVC 2 are sent twice as less as the word unfolds on the screen. Highlighting a word in the first half frame takes half the interval between circulation pulses, the second half remains hollow, and in the next half frame, on the contrary, the first half of the interval remains empty, and for the second half the words having an even address are highlighted. This makes it possible for the device to compare the vertical and horizontal slots.

The word in the OVC 2 contains the address part, which determines its place on the screen of the handset, and the information part that goes to the CCTPI modulation. Only those words that have information at least in one category are remembered.

i.e., if there is one dot on the screen, only one word is remembered.

When sampling from OVC (Output mode), the address is entered into address register 12, which is connected by comparison circuit 14 with address counter 13,

which is actually a tube tracking system. The modulation of the beam is allowed only if the addresses of the address register 12 and the address 13 counter, i.e., at the time the beam is located at a given location, coincide.

screen.

When operating in the "Enter the address 13" mode, it starts with the end of the frame blanking pulse. The communication of the control unit 7 and the address unit 4 allows only memory

words with different addresses. Sequential input of points that are within one word is carried out by accumulating information in separate bits of the same word, which simplifies further processing of the information array.

Switching from the “Output” To the “Input” mode by pressing the button of the light pen 8, then one input frame goes, and then the automatic switching occurs

back to “Conclusion. This makes it possible to almost instantly observe the entered point.

Subject invention

A device for displaying information comprising a memory unit connected in series, a synchronization unit, a cathode ray tube, a light pen, a control unit connected to the synchronization unit, and

An address unit connected to a memory unit, characterized in that, in order to simplify the device, it contains serially connected buffer registers, one of which is connected to the memory unit and the control unit, and an OR circuit connected to a cathode ray tube.