SU911616A1 - Magnetic tape device for processing data - Google Patents

Description

(5A) DEVICE FOR DATA PROCESSING ON A MAGNETIC TAPE

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The invention relates to computer technology and can be used in digital information recording devices based on tape cassette drives.

A data processing device on a magnetic tape is known, which contains a drive, a coding-decoding unit, a register, and a control unit tl. .

A known data processing system on a magnetic tape, comprising a drive, a buffer memory, a device, an input / output unit, a communication unit, a control unit 2.

However, in the known systems, there is no quick search for information on a magnetic tape, and the system does not operate without its own buffer memory when an external device, such as a video terminal, is connected to it.

Closest to the proposed technical essence is

a system comprising a control unit, a drive connected via a communication device with buffer memory A and B, which are connected via a second communication unit and an input / output device to the printing device 1-31

The above disadvantages are inherent in this system.

The purpose of the invention is the use of drives and acceleration of data retrieval.

The goal is achieved by the fact that "in the device containing the drive, the buffer memory, the I / O device with the decoding coding unit, the register and the communication unit, and the control unit, the marker extraction unit, the first and second counters, the multiplexer, the unit compare, second and third registers

20 a decoder, as well as second and third communication units, with parallel input and output. The first register is connected respectively to the output and input of the second communication unit, the drive is connected to the input of the marker allocation unit, the first and second outputs of which are connected to the Inputs of the first and second the second counter, respectively, the output of the first counter is connected to the first input of the multiplexer and through the third communication unit and the second register is connected to the first input of the comparison unit, while the output of the second register is also connected to the parallel input c The second counter is connected to the second input of the multiplexer through the serially connected third register and the decoder to the input of the storage unit selection, the output of which is connected to the second input of the comparison unit, and the control inputs of the counters, registers, communication units and multiplexer are connected to the control unit one of the inputs of which is connected to the output of the comparison unit. The drawing shows a block diagram of a data processing device. The device comprises a storage unit 1, a control unit 2, a buffer memory 3, a first communication unit k, a first register 5 a decoding encoding unit 6, a second communication unit 7, a data bus 8 connected to the communication units, an allocation unit 9 markers, first and second counters 10 and 11, multiplexer 12, comparison unit 13, third communication unit 1, second and third registers 15 and 16, and decoder 17 Control unit 2 is connected to unit 1 and the buffer memory 3 parallel inputs and outputs connected respectively to the output and input of the communication unit 7. The serial input and output of register 5 through block 6 are connected to block 1, and the parallel input and output of register 5 are connected respectively to the output and input of block k. The inputs of the counters 10 and 11 through block 9 are connected to the pinner 1. The output of the counter 10 is connected to the first input of the multiplexer 12 and the input of the communication unit whose output is connected to the input of the register 15; The output of the register 16 is connected to the parallel input of the counter 10, the input of the register 16 and the first input of block 13 comparison. The output of the counter 11 is connected to the second input of the multiplexer 12, the output of which. connected to the second input of block 13. 6. The output of register 16 through the decoder 17 is connected to the input of the selection of block 1 of the drive. The control inputs of registers 5, 15 and 16, blocks 7 and I, multiplexer 12, counters 10 and 11 are connected to one of the outputs of control unit 2, one of the inputs of which is connected to the output of comparison unit 13. The device works as follows. The information to be recorded is fed to the data bus from an external device, for example, from a computer. It can be entered through the communication unit 7 into the buffer memory 3, and after it is filled through the communication unit 7, the data bus 8, the communication unit 4, the register 5 and the decoding coding unit 6 are transmitted to the input of the unit 1 for recording on the magnetic the tape. If necessary, for example, in the case of working with a terminal with its own buffer memory, information can be directly transferred to the record via communication blocks C and 6 and register 5.. During playback, the information is the same way in the opposite direction. The device provides two modes of information retrieval. At the operating speed of the magnetic tape, the search for the necessary block is performed by the command Skip N blocks. The selection of markers separating the information blocks is carried out by block 9. Before searching, the register 15 records the argument N, received via the communication unit k from the bus 8. In the search mode, block 13 compares the counter code 11, which counts the number of marker signals with the output of block 9, with the register code 15 and when they match, gives a signal to stop. one . Fast search mode is possible when rewinding in the forward and reverse direction. After writing the argument N to the register 15, the rewind turns on, and the multiplexer 12 switches to the transfer to the input of block 13 of the code of the reversible counter 10, which determines the position of the magnetic tape. Block 1 when moving the tape produces a certain number of pulses per unit length of the tape. Marker extraction unit 9 performs the function e5.

The frequency of the pulses coming from the accumulator provides one pulse to a given section of the tape. If the counter code 10 coincides with the contents of register 15, the block 13 gives an impulse to turn off the rewind mode and turn on the playback mode. When the first marker signal appears, it stops.

If several drives are connected in parallel to register 15, the number of the selectable drive comes through the communication unit. On command from control unit 2, it is written to register 16, the state of which will change after the next re-selection of the accumulator. In this case, it is possible to record. through the communication unit T and the register 15 of the current position of the magnetic tape of the selected storage device in the maintenance counter.

Thus, a fast information search mode is provided at the speed of rewinding while fixing the beginning of the required information block. In addition, it is possible to connect multiple drives in parallel with their quick re-selection. The system is particularly effective when using tape drives.

invention formula

A data processing device on a magnetic tape containing a magnetic tape drive, a buffer memory block, a first register with serial and parallel inputs and outputs, the serial input and output of which are connected to the drive through the coding-decoding block, the control block associated

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with the aforementioned units, as well as the first communication unit connected to the data bus and the control unit, this is due to the fact that, in order to use several drives and speed up data retrieval, the marker extraction unit is inserted into the device, the first and second counters , multiplexer, comparison unit, second and third

registers, a decoder, as well as second and third communication units, the parallel input and output of the first register being connected respectively to the output and input of the second communication unit; the drive is connected to the input of the marker allocation unit, the first and second outputs of which are connected to the inputs of the first and second the second counter, respectively, the output of the first counter is connected to the first input of the multiplexer. and through the third communication unit and the second register is connected to the first input of the comparison unit, while the output of the second register is also connected to the parallel input of the counter and through the serially connected third register and decrypt 9Р to the input of the block selection, the output of the second counter is connected to the second input

multiplexer, the output of which is connected to the second input of the comparison unit, and the control inputs of counters, registers, communication units and multiplex (and connected to the control unit,

one of the inputs of which is connected to the output of the comparison unit.

Sources of information taken into account in the examination

1. USSR author's certificate №, cl. Q P 11/00, 1976.

2.US Patent W,

cl. 3 0-172, 5, 1973-.

H. Patent of the USA, If 3772657,. 3 0-172,5, 1373 (prototype).

Claims (1)

Claim A magnetic tape data processing device comprising a magnetic tape drive, a buffer memory unit, a first register with serial and parallel inputs and outputs, the serial input and output of which are connected to the drive through an encoding / decoding unit, a control unit connected 1616 6 with said blocks, and also a first communication unit connected to a bus. data and a control unit, which consists in the fact that, for the purpose of 5 using several drives and speeding up data retrieval, a marker allocation unit, a first and second estimators, a multiplexer, a comparison unit, second and third O registers, a decoder, and also the second and third communication units, the parallel input and output of the first register being connected respectively to the output and input of the second communication unit, however, 15, the feeder is connected to the input of the marker selection unit, the first and second outputs of which are connected to the inputs of the first and second about the counters respectively, the output of the first counter is connected to the first input of the multiplexer and through the third communication unit and the second register is connected to the first input of the comparison unit, while the output of the second register is also connected to the parallel input of the counter and through the third register and decoder connected in series to the selection input block. drive, the output of the second counter is connected to the second input of the multiplexer, the output of which is connected to the second input of the comparison unit, and the control inputs of counters, registers, communication units and multip eksora connected to the control unit, one input of which is connected to the output of the comparator unit.