SU452022A1 - Device for editing alphanumeric information on the screen of a cathode ray tube - Google Patents

Description

one

The invention relates to the field of automation and computing and can be used in the development of modern displays.

Devices for editing alphanumeric information on the screen of a cathode ray tube are known, comprising an input / output register and a buffer memory associated with a number register, a control unit connected directly and through the main address register with an address decoder connected to the buffer memory device.

The proposed device is characterized in that a label register, a comparison circuit and an additional address register are entered into it, the label register being connected to the control unit associated with the comparison circuit, the main address register and the comparison circuit connected to each other, and connected with deshi (} address ator.

This makes it possible to increase the reliability of the device, to expand the possibilities of editing alphanumeric text on a CRT screen.

The drawing shows a block diagram of the described device.

The device contains a buffer memory device 1, a register number 2, a address decoder 3, a main address register 4, an additional address register 5, a label register 6, a comparison circuit 7, an input / output register 8, and a control block 9. The device works as follows. In alpha qi4 output mode

information on the screen of a CRT is performed by sequential processing of the cells of the buffer storage device 1 according to the 4 address register, operating in the

HZ bills from control block 9. -Insertion may be performed from the beginning of the buffer device or from a marked character. from the light pencil marks the symbol on the screen, starting with which it is necessary to insert, and presses the Insert key on the remote control. In this case, the address of the selected character is transferred from the address register 4 to the register 6 of the label.

On the Input signal, the character is entered into the I / O register 8. According to the same signal, the address of the last unit cell of device 1 is entered into register 5 of the additional address, and the register of the last but one cell is entered into register 4 of the address. After this, registers 4 and 5 are enabled in the counting mode on, during which the reading of the device cells is carried out on the register of 4 addresses, and the contents of these cells are recorded on the register 5 of the additional address. Thus, there is a separation of alphanumeric information in the device 1 by one character. In the counting mode of registers 4 and 5, register 4 and register 6 of the tags are connected to comparison circuit 7. According to the comparison signal, the circuit outputs the end-of-spread signal, in which the counting mode for -1 registers 4 and 5 is stopped, and the address register changes to normal operation mode, +1, and the circuit automatically switches to replacement mode. The address is transferred from the register 6 of the label to the register 5 of the additional address and after the next character is scanned on the screen, the character stored in register 8 of the I / O is written to device 1 at the address stored in the register of the additional address. After that, the contents of the subaddress register are incremented and the address is transferred back from the subaddress register to the label register, which is required to store the substitution address for the period of separation when the next character is inserted. This completes the Insert character on screen and the device is ready to insert the next character. The Zaman operation, as well as the Insert, can be carried out from the initial zone of the buffer device or from the character marked on the screen with a light pencil. The operator marks the light with a pencil symbol, starting with which it is necessary to replace the text. By pressing yutavishi Replacement, the address of the address marked from register 4 is moved to register 6 of the label. On the Input signal, the character is assigned to the register in the I / O register. Upon completion of the sweep on the screen of the next character, the signal from the control device 9 is transferred from the register of the label to the register of the additional address. The subaddress register is switched to the address decider, and this address is written to device 1 from the I / O register, after which the address in the subaddress register is incremented by +1 and the address is transferred back from the subaddress register to the label register. This completes the Replace Character on Screen and the device is ready to replace the next character. In the Erase process, the operator marks two symbols on the screen using a light pencil, between which it is necessary to erase the array, then presses the Erase key, and the address of the second marked symbol is sent to register 6 of the label. The address register operates in the counting mode on fl, and when the address of the first marked character is reached in it, the Erasin mode begins. At the same time, the address register and the label register are connected to the comparison circuit. At the comparison signal, the erase mode is terminated. During Compression, the operator marks on the screen with a light pencil two symbols of the compressible array, and then presses the Compression key. The address of the first marked character is written to the subaddress register, the address of the second marked character is written into the label register. Immediately after the census of the second address, registers 4 and 5 are allowed to operate in parallel in +1 mode, during which cells of the buffer memory are read by the address register, and the content of these cells is recorded in the additional address register (the record occurs in the additional cycle of addressing a buffer storage device organized by the signal from the control unit). At the overflow signal of the address register peJKHM, the compression is stopped and the circuit automatically switches to the Erase mode. Operation The zone is displayed as follows. The operator marks two characters on the screen, limiting the output array, and then presses the Zone output key. In this case, the address of the first marked character is written to the register of the additional address, and the address of the second is written to the label register. At the request of the external device to which the next character is output to the screen after scanning, the buffer device cell is read in a register of the additional address, after which the code is transmitted from