SU1377847A1 - Data input device - Google Patents

Abstract

The invention relates to computing and can be used to manually enter information into control and computing systems. The purpose of the invention is to increase the reliability of the device by reducing the number of switching elements and expanding the field of application of the device by providing input of information in various codes. The device contains a pulse generator 1, a counter 2, a decoder 3, a multiplexer 4, a matrix of 5 switching elements, a tone, a first trigger 6, a delay element 7, a register 8, a second trigger 9, a first 10 and a second II elements I. A character code is entered in register 8, two successive presses of the switching elements of the matrix 5. The code of the first key pressed is entered into the higher bits of the register 8. After the first key is released, the second trigger 9 enables writing to the lower bits of the register 8, the keyboard scan is resumed gical 5. Code zanosits second key pressed to the lower 8 bits of the register, after releasing the keys generated councils nschy signal issuing complete code. I il. § (L

Description

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The invention relates to computing and can be used in data preparation devices for input into computers, as well as in information transmission and processing systems, in which data is entered manually from the keyboard.

The aim of the invention is to increase the reliability of the device by reducing the number of switching elements of the keyboard, expanding the field of application by providing input information in various codes.

The drawing shows a diagram of the proposed device.

The device for entering information contains a generator of 1 pulses, a counter 2, a decoder 3, a multiplexer D, a matrix of 5 switching elements

com, the first trigger 6, the delay element 7, the register 8, the second trigger 9, the first element And 10, the second element And P.

The device works as follows.

The character set is performed by two successive presses (clock cycles) of the information switching elements of the matrix 5. Consider the operation of the device using the example of entering the digit 9 in the DKOI-8 code. The digit 9 is encoded in DKI-8 with the hexadecimal number F9. In the first cycle, the F key on the 16-key keyboard 5 is pressed, and on the register 8, the first half of the code for number 9 is formed as follows.

The pulses from the generator 1 pulses through the first element And 10 arrive at the counting input of the counter 2 and the pulses are counted. The first half (lower bits) of counter 2 is connected to decoder 3, from the output of which polling pulses are output to the vertical busses of matrix 5, and the second half (higher bits) are connected to address inputs of multiplexer 4, which sequentially connects the information inputs. Thus, when the switching element F is pressed on the counter 2, a code is sequentially formed, and with a code of four units, a polling pulse is output from the decoder 3 to the vertical bus with the switching element F. At the same time, the multiplexer connects the horizontal bus from the switch

In this case, at the forward output of multiplexer 4 there will be one, which, through delay element 7, will go to the setup input of the first trigger 6 and coax it. From the inverse output of the trigger 6, a signal will arrive at the first input of the element And 10 and close it. On counter 2, a code of four units will be fixed, which will be overwritten in register 8, since at the same time units from trigger 9 of multiplexer 4 arrive at the inputs of register 8. When the switching element F is released at the inverse output of multiplexer 4, the unit that resets trigger 6 and on the falling edge of the signal from the direct output of trigger 6 recalculates trigger 9, from the direct output of which a unit (resolution) is given to the inputs of register 8. Trigger b removes the prohibition from the second input of element 10. Counter 2 starts.

In the second cycle, when the switching element 9 is pressed, with the code 1001, the counter 2 similarly operates multiplexer 4, at the direct output of which there appears a unit that resets the trigger 6 and, through element 10, prevents the counter from being recalculated 2. The code from counter 2 is entered into register 8, since the register 8 input will be one (resolution) input. When the switching element 9 is released, the trigger 6 is reset, and at the output of the second element I 1I, a strobe signal appears allowing the 9 character code 11111001 to be removed from the register 8 output. Similarly, other characters of the alphabet are entered. If it is necessary to enter figure 9 in the KOI-8 code from the device, which is represented in the hexadecimal code as 39, then it is necessary to press the keys 3 and then 9. Thus, in the device, the original coding determines the alphabet of characters, i.e. the output code of the symbol, which provides versatility to the device. the ability to enter characters in any code.

The proposed device allows the reduction of the full set of standard keyboard keys to sixteen, which reduces the number of keyboard switching elements, increasing

device reliability, improves overall weight characteristics, makes the device versatile and allows characters to be entered in any code.

Claims (1)

Invention Formula A device for inputting information containing a matrix of switching elements, a pulse generator, a counter, a decoder, a multiplexer, a delay element, a first trigger and a first And element, the output of which is connected to the input of the counter, the outputs of the lower and higher bits of which are connected respectively to the inputs of the decoder and address the multiplexer inputs, the direct and inverse outputs of which are connected respectively to the input of the delay element and the reset input of the first trigger, the inverse output of which is connected to the first input of the first of the AND gate, to the second input of which is connected the output pulses of the generators, the output of EA Derzhko element is connected to input of the first flip-flop mounting, the decoder outputs are connected to inputs of switching elements of the matrix, the outputs which are connected to the corresponding information inputs of the multiplexer, characterized in that, in order to increase reliability by reducing the number of switching elements and expanding the scope of application by providing information input in various codes, the device contains a register, a second And element and a second trigger, direct and the inverse outputs of which are connected respectively to the recording enable inputs of the high and low bits of the register, the output of which is the information outputs of the device, the first output of the watt The first element is connected to the direct output of the multiplexer, the direct output of the first trigger is connected to the counting input of the second trigger, the second input of the second element is connected to the inverse output of the second trigger, the gate input of the register is connected to the inverse output of the multiplexer, the outputs of the counter are connected to information the high and low bits of the register, the output of the second element, AND, is the gate output of the device.