SU1416992A1 - Digital computer-to-tape recorder interface - Google Patents

Abstract

The invention relates to the field of computer technology, in particular to devices for interface, and can be used in the development of devices for interface DVM with home audio recorders. The aim of the invention is to improve the reliability of loading information into 1DVM. The device contains a parallel code converter I in a sequence, modulation unit 2, an output control unit 3, a synchronization unit 4, a square pulse generator 5, an input channel 6, a serial code converter 7 in parallel, input control unit 8. The device provides for reading and writing information recorded on a magnetic tape in a digital computer 1 hp. f-ly, 7 ill.

Description

Fig. relates to the computational theory, in particular, to devices for interfacing, and can be investigated, because of the control of the recording sound recorder.

The purpose of the invention is to demonstrate the reliability of loading, information in a digital computer.

11a of FIG. 1 shows the block diagram of the device; FIG. 2 is a diagram of a modulation unit; FIG. in fig. 3 is an output control block diagram; FIG. 4 is a diagram of a serial to parallel converter; in fig. 5 is a diagram of an input control unit, and FIG. 6 is a diagram of an input channel; in fig. 7 is a block diagram diagram.

The device contains (FIG. 1) a parallel-to-serial code converter 1, a modulation unit 2, an output control block 3, a synchronization block 4, a square pulse generator 5, an input channel 6, a serial to parallel converter 7, an input control block 8, input 9 of the device for connecting the information output of the digital computer, input 10 of the device for connecting the recording output of the digital computer, input 11 of the device for connecting the reading output of the digital computer, input 12 of the device for connecting the analog output of the tape recorder, input 13 of the device connecting the reset output of the digital computer, output 14 of the device for connecting to the analog input of the tape recorder, output 15 of the device for connecting to the second input of the digital computer breakdown, output 16 of the device for connecting to the first input of the digital computer breakdown, output 17 of the device for connecting to the information input of the digital computer, bus 18 of the unit potential of the device, information input 19 of modulation unit 2, inputs 20 and 21, respectively, of synchronization and shift of a parallel code converter 1 to serial, first 22 and second 23 outputs of synchronization unit 4, outputs d 24 5 straight mougolnss generator pulses, data output 25 and output sync 26 channel 6 input and a second output 27, the serial-to-parallel converter 7.

Modulation unit 2 forms (FIG. 2) a multiplexer 28 and an analog signal driver 29.

The 3-control unit consists of (fig. 3) delay element 30.

five

0

five

0

five

0

five

0

five

the trigger 31, the element And 32 and the counter 33.

The serial encoder 7 in parallel contains, in fig.4j, a delay element 34, fs of switching 1-fir 35 pulses, and a shift register 36.

D) Lock 8 of the input control is performed on (see Fig. 5) decoder 37, counter 38, trigger 39, and element 40.

Input channel 6 contains (fig.b) a voltage divider consisting of a first 41 and second 42 registers, a comparator 43, a pulse shaper 44 and a digital 45 hour analyzer — TOTj including the first 46 and second 47 triggers, element 48, third 49 and fourth 50 triggers and counter 51.

The synchronization unit 4 forms (FIG. 7) a frequency divider 52 by 8 and a frequency divider 53 by 2.

In the mode of outputting information from the digital computer, the device operates as follows.

In the initial state, the trigger 31 outputs the ready signal to receive data to the device output 15. The information word (for example, 8-bit) is fed from the digital computer to the information input 9 of the converter 1 of the parallel code to the serial one, and a constant voltage corresponding to the level

The output of the information word from the digital computer is accompanied by a pulse arriving at the input 10 of the input control unit 3, while the information word is picked up along its slice. The pulse received at the input 10 of the input control unit through the delay element 30 is fed to the first input of the trigger 31 and the synchronization input 20 of the register of the converter 1, in which the information word and bit (I) are recorded in the upper order, which is used to determine the beginning of the information the words. The pulse element 31 is triggered to the one state by a pulse slice, and the output signal is removed at the output 15 of the device, the converter 1 switches from the parallel information recording mode to the sequential reading of the code of the written information word, and to the first input

That AND 32 postutting resolving potential.

Coming from the first output of block 4 of synchronization to the second input of the element I 32 pulses with a frequency of 2.5 kGd from its output are passed to the input of counter 33 and to the input 21 of the shift of the converter 1 to shift the recorded information. The information in the serial code from the output of the converter 1 goes to the modulation unit 2 at the control input of the multiplexer 28. The two other switched inputs of the multiplexer receive a continuous sequence of 2.5 and 5 kHz pulses, respectively. Depending on the code sequence arriving at the control input of the multiplexer, from its output to the input of the imaging unit 29, pulses of a frequency of 2.5 kHz are received when arriving at the control input of the multiplexer O or with a frequency of 5 kHz when inputting 1. The inputs to the imaging of the imaging device 29 In the sinusoidal signal and through the analogue output 14 of the device are fed to the input of the tape recorder. Conversion pulses corresponding to 1 and O are formed in synchronization unit 4 by dividing the reference frequency with frequency divider 52 by 8 and frequency divider 53 by 2. The reference frequency to the input of the synchronization unit comes from the reference frequency generator 5.

At the same time, the counter 33 produces a count of pulses arriving at the shift of information recorded in the register of the converter J. When the ninth pulse arrives, i.e. when reading the start word of the information word and eight information bits, the counter 33 sets the trigger 31 to the zero state, while the passage of pulses through AND32 is disabled and the readiness to receive the next information word from the computer is set at the output 15 of the device.

Thus, on the tape of a tape recorder, a code sequence of words consisting of the beginning bit of the information word and eight information bits is recorded. When writing software from a digital computer, zero codewords are successively entered, then the start-up

vat, / 1HH () ,,, with it dsg) - terminated dvorgchnn last () c; gg.chichi (1 program 1 "1 loader, for example the loader with punched tape in the direct format mg-gk-roEVEL Elekt G rinika-bom, then the command codes of program number 1.

In the input mode information from the output of the tape recorder in the digital computer, the device operates as follows.

From the digital computer, through input 13, an impulse for setting the initial state of the device arrives, which sets to zero the state of the counter 38 and

trigger 39. Input information from the output of the tape recorder through the analog input 12 of the device enters the comparator 43, from the output of which the sequence of pulses goes to

the driver input 44, which generates pulses with steep edges. The pulses from the output 25 of the input channel are fed to the input of the serial code converter 7 in parallel and to the input of the trigger 46, which serves to synchronize the information coming from the tape recorder with the reference frequency of the generator 5. The triggers 46 and 47 and the And 48 element generate trigger pulses for the counter 51 and Ditch 49 and 50.

The trigger pulse, formed at the output of the element And 48, records the number twelve in

the counter 51, the trigger 49 is set to one, and the trigger 50 is set to the zero state.

The number recorded in the counter 51,

starts to count as pulses of the reference frequency of the oscillator 5. If the frequency of the conversion comes from the output of the tape recorder corresponding to O (2.5 kHz), then at the input of the counter 51

A transfer pulse appears that sets the trigger 50 V. the initial state, and the output 26 of the input channel 6 produces a signal corresponding to O, which is fed to

converter input 7, If a frequency corresponding to 1 (5 kHz) comes from the output of the tape recorder, then a transfer pulse does not appear at the output of counter 51, so

As before the number written to counter 51 is read, the next number is written to counter 51. at the output of the trigger 50, a signal is generated corresponding to 1C1.1T 1, which

five . comes from the output 26 of the input channel to the input of the converter 7. The pulses of the C- output of the imaging device 4A come from C; the output 25 of the input channel to the input of the single-oscillator 34, which extracts pulses, which are fed to the input of the imaging unit 35, which forms the cut-off pulse. The pulse shaper 35 records the bit register received from the output 26 of the input channel. After writing in the shift register 36 bits, nine bits at the output 27 of the register 36 appear, corresponding to the beginning of the formation of the word and arriving at the second input of the element 40 of the input control block 8. The code combination of the information word, recorded in register 36, from the output 1 of the device enters the digital computer on the decoder 37 of the input control block 8 to detect the start word code. When the start word code is detected, a pulse from the output of the decoder 37 is fed to the input of the counter 38, for example, modulo 16, which, after sixteen start words are received by the output pulse, sets the trigger 39 to one state. Installing the flip-flop 39 in a single state captures the arrival from the output of the tape recorder the beginning of the recorded software. From the output of the flip-flop 39 1, it enters the first input of the element I 40, and at its output a signal is prepared by the device to enter the information word into the digital computer, which is transmitted to the digital computer from the output 16 of the device. The recording of the information word in the digital computer is accompanied by a pulse at the input 11 of the device, with which the shift register 36 is reset. By this, the output 27 of the converter 7 is set to zero, which is fed to the second input of the element E 40, and the readiness signal at the output 16 of the device is removed.

Claims (2)

1. A device for interfacing a digital computer with a tape recorder, containing a parallel code-to-serial converter, a modulation unit, a synchronization unit, an input channel and a serial code-to-parallel converter, with the device inputs for connecting an information output of a digital computer and analog output 926 the hub recorder's tape recorder respectively with the first informant on the input of the parallel code to serial converter and with the information input of the input channel; the second information input of the parallel code to serial converter is connected to the unit potential bus of the device; modulation unit and with the first output of the serial code converter in parallel, the information course and the clock input, which are connected respectively to data output and the output synchronization input channel, the output of the transducer parallel to serial is connected to the data input of the modulation unit, the first and the second clock inputs of which are connected respectively, with the first, second outputs of the synchronization unit, which are tacted by the fact that, in order to improve the reliability of loading information into the digital computer, a square pulse generator, an input control block and an output control block are entered into it, and the square pulse generator output connected to the synchronization inputs of the sync block input channel, the first, second outputs of the serial to parallel converter are connected to the first, second informational inputs of the input control unit, the ready output and the installation input of which are connected respectively to the output and input of the device for connecting the first interrupt input of the digital computer and the reset output of the digital computer, input output connectors  1 shadow of digital computer connected to serial mode converter to parallel mode input, synchronization input, resolution input, syn50 outputs 55 synchronization and shift of the video output control unit are connected respectively to the first output of the synchronization block, to the input of the device for connecting the write output of the digital computer, to the synchronization and shift inputs of the parallel code to serial converter, the mode input of which and the output of the device for connecting the second interrupt input of the digital computer 714 output control block, the output control block contains a delay element, a trigger, an And element and a counter, and the synchronization and resolution inputs and the output mode of the block are respectively connected with the first input of the And element, with the input of the delay element and with zero In the trigger code, the unit output of which is connected to the second input of the element I, the output of which is connected to the counting input of the counter and the output of the block shift, the output of the counter is connected to the zero input of the trigger, the unit input of which is connected to the output ohm delay element and with the synchronization output of the block, the input control block contains a decoder, a counter, a trigger and an element And, the first, second information inputs of the block are connected respectively to the input of the decoder and the first input of the And element, the installation input of the block is connected to the reset inputs of the counter and the trigger, the output element And is connected to the output ready2 - block, the output of the ppkby of the torus is slin-linear with the counting input of the counter, the test of which is connected to the trigger synchronization input, the output of which .. connected to the second input of the element N. 2. The device according to claim 1, characterized in that the input channel contains a comparator, a pulse shaper and a voltage divider, with the information input of the channel. pa connected to the first input of the comparator, the second input of which is connected to the midpoint of the voltage divider, the first output of which is connected to the zero potential bus of the device, the output of the comparator is connected to the second output of the voltage divider and the input of the pulse generator, the output of which is connected to the information output of the input channel and the information input of the digital frequency analyzer, the synchronization input and output of which are connected respectively to synchronization input and with input channel synchronization output. Phi. g fig.Z FIG. 6 . 7