SU605224A1 - Device for editing alphanumeric information on crt screen - Google Patents

Description

the main address register and the label register.

The purpose of the invention is to increase the reliability and simplification of the device.

This is achieved by entering a character register into the device, connected to the third input of the memory block, the output of which is connected to the input of the character register and the fourth input of the memory block.

The drawing shows a block diagram of the device.

The device contains an input / output register 1 for inputting and outputting information, a control unit 2 serving to control all the units of the device, a memory unit 3 with a capacity of one information frame (L bits), a 4 character register provided for storing information in one character, register 5 of information line 5 for storing and recycling characters in the amount of one information line.

The operation of the device is considered with a recirculation type memory in which information circulates with the frequency of information displayed on the screen of a cathode ray tube.

The information is entered into memory block 3 and is output from it via register 1 in the same way as these operations are performed in such information display devices.

The main operations when editing text on a cathode-ray tube screen are: "Sliding text by one character to insert a character and" Sliding text by one character to eliminate an unnecessary character or extra space.

Spreading of the text occurs on the screen of the cathode ray tube in the place indicated by the marker. In order to do this, when circulating information in memory block 3, by the command that is generated in control block 2, at the moment of the appearance of the marker, circulation circuits in memory block 3 are switched. If the usual information circulates through the circuit, including L information bits (the output of the memory unit is connected to one of the inputs of this device directly), then with the arrival of the specified command, the circulation begins to occur along the circuit through a 4 character register (the output of the memory unit is connected to the input of the register of the symbol, and the output of the specified register - to the second input of the memory block), which includes () information bits, i.e. the memory block is L bits, and the character register is 1 bit.

The 4 character register also operates in recycle mode. This causes the character indicated by the marker to be delayed by one position in memory block 3, freeing up the position for inserting another character. Subsequent characters are also delayed by one position each, since they also pass through the character register. When the last character of the information frame falls into the character register and prepares

the next cycle of information circulation, control unit 2 forms a command that switches memory unit 3 to normal circulation in an L-bit circuit (the output of the memory unit is connected directly to the input of this unit).

As a result of this operation, all characters, starting from the sign indicated by the marker, to the penultimate character, are delayed by one position in memory block 3. On the cathode-ray tube screen, these symbols are moved one position to the right. The last character disappears. This operation may extend to a group of characters.

any other length, for which, from the control unit 2, a command for switching the memory unit 3 to the normal bit circulation should be formed after the last character of the shifted group of the register 4 passes

character.

Nov. Switching circuits of circulation in subsequent cycles in the indicated order, it is possible to disassociate the text by any number of characters.

When shifting the text before the start of the circulation cycle in which the operation will take place, the control unit 2 issues a command that switches the circulation circuit from the usual L-bit circulation to (L / + 1) -bit,

i.e. with a case of 4 characters.

The circulation mode continues until the character to be eliminated and indicated by the marker is stored in register 4, after which the command from the control unit 2 reverses the circulation circuits to the normal bit value.

As a result of this operation, at the end of the specified circulation cycle, the group of characters from the first character to the character preceding the character indicated by the marker is delayed by one position in the memory block. The character indicated by the marker is eliminated because its place is taken by the preceding character. In this case, the first one is released.

position in block 3 of memory.

For the purpose of initial placement in the memory unit and on the screen of the cathode ray tube of a shifted group of symbols, i.e., have the first symbol occupy the first

familiarity, the second - the second, the command from the control unit carries out a general movement of all information in the memory unit by one position (for example, for memory made on shift registers, this is achieved by generating one additional clock of the total shift).

This command is formed in the interval from the completion of the shift operation to the beginning of the next circulation cycle. Novtor in the subsequent cycles indicated actions, you can ensure that the text is shifted by any number of characters.

Claims (2)

The operations of replacing the character and erasing are performed through the input / output register by writing to the memory block at the place indicated by the marker of the new required character or space, respectively. The memory unit in the proposed device can serve not only the memory of recirculation type. When using the address memory, the number register chain is included in the register of the symbol that is connected to the chain with the number register or excluded from it but to the commands coming from the control unit, in the same way as described for the memory of the recycling memory. Introduction to the device for editing alphanumeric information on the screen of a cathode ray tube register by one character creates a positive effect, which is that due to the minimal addition, i.e. the register by one character, it is possible in principle to implement editorial operations CRT devices. This leads to an increase in the reliability of the device and its simplification. A formula was invented and a device for editing alphanumeric information on the screen of a cathode ray tube, containing a control unit, the outputs of which are connected to the first inputs of the I / O register, the memory block and the information line register, the second input of which is connected to the output of the us block, the second input which is connected to the output of the register I / o, the second input of which is the input of the device, characterized in that, in order to increase the reliability and simplify the device, it contains the character register, turn is connected to the third input of the memory unit, whose output is connected to the input character register and the fourth input of the memory unit. Sources of information taken into account in the examination 1.US Patent N ° 3706075, cl. 340-172.5, 12.12.1972. 2. Authors' certificate of the USSR LR 452022, G 06K 15/20, 1972. (3 computers in sign nerator