SU1654831A1 - Device for interfacing a computer to a tape recorder - Google Patents

Abstract

The invention relates to computing and can be used in various computers for transmitting and receiving data over a single-channel communication line, in particular, to / from a tape recorder. The aim of the invention is to expand the scope due to the ability to control the encoding format of the transmitted information and increase the noise immunity. The device contains a sequential I / O unit, two timers, a NOT element, three NAND elements, a sinusoidal wave shaper, a shaper signal. 3 il. (L

Description

The invention relates to computing and can be used in various computers for transmitting and receiving data over a single-channel communication line, in particular, to / from a tape recorder.

The aim of the invention is to expand the scope due to the possibility of controlling the encoding format of the transmitted information and improving the noise immunity.

FIG. 1 shows a block diagram of a device for interfacing an electronic computer with a tape recorder; in fig. 2 - time diagrams of information output; in fig. 3 - time diagrams of information input.

The device (Fig. 1) contains a block

1sequential I / O, multi-channel programmable timers

, elements AND-NOT 4-6, elements NOT 7, shaper 8 sine wave signal shaper, square wave shaper 9, synchronization input 10, information input-output 11, output 12 of the transmitted square signal, analog output 13 and analog input 14.

The device works as follows.

To the input 10 of the device (input C1 of block 1, input C2 of timer 2, input of the NW timer 3) from the computer receives sync

00

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quartz stabilized for synchronization of operation of block 1 and timers 2 and 3. Block 1 can be programmed to transfer (output) and receive (input) binary data (information) at a given speed and a specified format of a single data send. Each data send starts with a start bit (logch and ends with a JQ with one (or two) stop bits (log.1). The transmission (reception) time of each bit of binary data, i.e., the data exchange rate with the tape recorder is programmed zero channel- 15 timer timer 2 and block 1. Upon completion of the initialization of block 1, the output of the transmitter OUT sets the voltage corresponding to

level log. 0m, at the output B2 of the second channel of the timer 2. Moreover, the plant corresponding to the log. 1, an integer number (for example, twice) is greater than the frequency corresponding to the log. Oh, and each of them is an integral number of times the synchronization frequency of the receiver and transmitter of unit 1, and all these frequencies must be within the bandwidth of the tape recorder.

FIG. 2a - d, the time diagrams of the signals are presented (when a two-bit word 01 is output), respectively, at the output of the OUT of block 1 (the input P2 of the timer 2), the input of the RZ timer 2 and the output B2, the output of the OT timer 2.

With the help of elements 4-6 on the output mode of the square wave generator, the constant level of the log, 1 at the start of timer 2 provides uninterrupted1

thirty

35

log 1. The first, second, and third block of element 12 IS-NOT 6; the clock of timer 2 is programmed into the coded signal corresponding to the output information; the phase of the generated signal when changing coding frequencies (transition from log. Log., O and vice versa) does not change.

FIG. 2e shows a timing diagram of the signal at the output 12 of the element IS-HE 6, coming through the driver 8 to the output 13 of the tape recorder when outputting a two-bit word 01. The driver 8 provides a narrowing of the frequency spectrum of the transmitted signal.

When entering information, the sinusoidal information signal coming from the tape recorder to the device input 14 is converted in the shaper 9 into the rectangular shape of the same frequency and fed to the trigger input of P1 timer 3. Time diagram of the signal at the P1 input of timer 3 when entering the two-digit word 01 presented in FIG. Behind. The first and second channels of timer 3 are programmed into the standby multivibrator mode with restarting via their control inputs, P1 and P2, respectively, with the leading edge of the rectangular voltage. With each start (restart), the duration of timer 3 formed at the output of the first channel B1 slightly exceeds the frequency period, the corresponding log. 1, and at the output of the second B2 channel, the time | | The operation of the zero channel in mode 25 of the meander generator. The signal from output B1 of the first channel of timer 2 serves to synchronize the operation of the transmitter (when outputting information) and the receiver (when entering information) of block 1, respectively, through the PSD and SPm inputs, and its frequency is determined by the requirements for the speed of data exchange with the tape recorder.

When recording to a tape recorder, the output binary data in a parallel code comes from the computer to the bidirectional multi-channel input-output 11 of the device and information input-output D1 of unit 1, is converted into a serial bit stream from the output OUT of the transmitter of unit 1 directly to the start input P2 the second channel of timer 2, and through the element NOT 7 - to the input of the start of the relay of channel 2 of timer, and controlling the channels of timer 2 in such a way that the level of the log. 1 at the output of the OUT unit 1 causes the appearance of a meander with a frequency corresponding to

40

45

log 1, at the output B2 of the first channel of timer 2 and a constant voltage corresponding to the level of the log. 1, at the output of the second OT channel timer 2, and the level of the log. 1 at the exit. OUTPUT

50

55

pa 3 - exceeds the frequency period, the corresponding log. 0m Since the output B1 of the first channel of timer 3 is connected to the input P2 of the second channel of this timer, when they work together

1 causes the appearance of a meander with a frequency corresponding to the log. Oh, at the output of the OT of the third channel of timer 2 and constant voltage, corresponding to

five

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level log. 0m, at the output B2 of the second channel of the timer 2. Moreover, the plant corresponding to the log. 1, an integer number (for example, twice) is greater than the frequency corresponding to the log. Oh, and each of them is an integral number of times the synchronization frequency of the receiver and transmitter of unit 1, and all these frequencies must be within the bandwidth of the tape recorder.

FIG. 2a - d, the time diagrams of the signals are presented (when a two-bit word 01 is output), respectively, at the output of the OUT of block 1 (the input P2 of the timer 2), the input of the RZ timer 2 and the output B2, the output of the OT timer 2.

Using items 4-6 on the output

pa 3 - exceeds the frequency period, the corresponding log. 0m Since the output B1 of the first channel of timer 3 is connected to the input P2 of the second channel of this timer, when they work together

decoding of the signal of information arriving at input 14, and output B2 of timer 3 (input HhPm of receiver block 1) occurs, the signal has the form corresponding to the output. At the same time, the frequency of the input signal I 1 II is higher.

information, the output of the write control, the output of the read control and the address output of the electronic computer, the information output of the low block corresponds to the log. one

log A. The time diagrams of the signaling input / output are connected to the input of the NOT element, the input and output of the device for connecting to the output and input of the tape recorder are connected according to output B1 of the first channel time-JQ to the input of the signal conditioner a 3 (input VhPm receiver unit 1 ) rectangular shape and with the output of the shape | ri output of the two-bit word 01, the sinusoidal waveform generator 1 is represented respectively in FIG. 3b, the inputs of the block selection in sequence and in.

The receiver of block 1 for inputting information is synchronized on the leading edge of the start bit, and confirmation of its reception and fixation of each input / output and the first timer is connected to the input of the device for

Before the received bit, connections are made respectively to the first and second outputs of identifying external devices of the electronic computer, characterized in that, by programmed (for over 20 what, to broaden the scope of the application), the device’s passage time . The end of the reception of a single sending of the coding format of the informer is confirmed by the reception of the stop bit. to improve its noise-tolerance- the information is transformed into properties, it additionally contains in block 1 a parallel code and from the input 25 timer, the second and third elements of output D are fed through the input-output AND-NOT, and the output of the signaling device - 11 in the digital computer.

On the input-output D, the input At the block 1, the input-output D, the input At the timer 2 and

the rectangular shape is connected to the start input of the first channel of the first timer, the output of the first channel of the kononization, the write control output, the read control output and the address output of the electronic computer, the information output of the serial I / O unit is connected to the input element HE, the input and output of the device connections to the output and input of the tape recorder are connected respectively to the input of a square waveform former and to the output of a sinusoidal waveform generator, the inputs of the block ka sequence

I / O and the first timer are connected to the input of the device for

connecting respectively to the first and second outputs of identifying external devices of the electronic computer, characterized in that, in order to expand the field of application of the device by providing control of the information encoding format and increase its noise immunity, it additionally contains a second timer the second and third elements of NAND, with the output of the signal generator

A rectangular shape is connected to the start input of the first channel of the first timer; the output of the first channel is

input-output D, the input At the timer 3 OSU-30 th connected to the input of the second channel

There is a connection with a computer for programming and controlling the operation of block 1, timers 2 and 3, respectively.

As block 1 can be used chip KR580VB51, and as timers 2 and 3 - chip KR580 VI53.

Claims (1)

Invention Formula the first timer, the output of the second channel of which is connected to the information input of the serial I / O unit, the start input of the first channel of the second timer is connected to the logical zero bus of the device, the output of the first channel of the second timer is connected to the synchronization inputs of the receive and transmit of the serial I / O the output of which is connected to the start input of the second channel of the second timer and the first input of the first NAND element, the second input and output of which are connected to a corresponding device an electronic computer with a tape recorder containing a square-shaped signal former, a first timer, a serial input-output block 45 with the output of the second channel of the second water, a NOT element, the first NAND element, a timer, and the first input of the second generator sine-wave signal signal IS-NOT, the output and the second input are Forms, and the information inputs-outputs of the serial I / O unit and the first timer are combined and connected to the input-output device of the device for connection to the data bus computer, synchronization inputs, read control inputs, write control inputs and inputs of the serial I / O unit and the first timer are connected respectively to the inputs of the device 50 connection to the output of the first timer, the output of the second channel of which is connected to the information input of the serial I / O unit, the start input of the first channel of the second timer is connected to the logical zero bus of the device, the output of the first channel of the second timer is connected to the synchronization inputs of the receive and transmit of the serial I / O which is connected to the start input of the second channel of the second timer and the first input of the first NAND element, the second input and output of which are connected respectively to the output of the second the channel of the second timer and with the first input of the second element NAND, the output and the second input of which connected to the output of a sinusoidal waveform generator and to the output of the third NAND element, the first input of which is connected to the output of the third channel of the second timer, the start input of the third channel of which is connected to the output of the NOT element and to the second input of the third element a and NOT, information input, sample input, synchronization input, write control input, read control input and the second timer feature input are connected to the device inputs for connecting respectively to the data bus, third output ID identification of external devices, high-speed pulse shh the control of the write, the output of the control of reading and the address output of the electronic computer. . ( .0 Stop pulse t sh and