SU1291954A1 - Information input device - Google Patents

Abstract

The invention relates to computing and automation and can be used to enter information into a computer from a keyboard. The invention makes it possible to increase the reliability of the device by blocking the formation of an erroneous signal (code) and to provide diagnostics by generating codes of keystrokes. For this, a counter, a depotfader, a delay element, two triggers, an AND element and an NOT element are entered into a known device. 1 il .. (L S

Description

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The invention relates to computing and automation and can be used to enter information into electronic computers from a keyboard.

The aim of the invention is to increase the reliability of the device.

The drawing shows a functional diagram of the device.

The device contains a keyboard 1, which includes a matrix of switching elements.2 and a block 3 of signal conditioners, a block 4 of memory, a register 5, a HE element 6, a pulse generator 7, a counter 8, a decoder 9, the first trigger 10, the second trigger 11 , the third trigger 12, the first 13, the second 14 and the third 15 elements And, the element 16 delay.

The operation of the device is as follows.

The signals at the output of keyboard 1 are the cell address of memory block 4. In each cell of memory block 4, uniquely defined by the address, there is a ready bit set in the allowed addresses and not set in the forbidden addresses, an error bit not set in the allowed addresses and set to forbidden, and the output code of the device for allowed addresses, uniquely corresponding to the state of the keyboard block 1.

In the initial state, the keyboard unit i forms the inhibiting cell address of the memory block 4. The contents of the memory cell are present at the output of the memory block 4. The signal of the uninstalled Readiness bit from the first output of the memory block 4 through the NOT 6 element prohibits the generator 7 of the counter 8, and through the delay element 16 and the AND 13 element resets the trigger 11, from whose output the enabling signal is sent to the generator 7 and the counter 8. Counter 8 is in the zero state. According to its signals, the decoder 9 generates a signal that prohibits writing to register 5, triggers 10 and 11, and closing elements and 15. Triggers 10 and 12 are cleared by the trigger from the input of the Reset device. A trigger signal is supplied from trigger output 10 to generator 7, and a signal corresponding to the absence of the output code of the device is output to the Ready Device output.

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When pressing the matrix key of the keyboard unit. At its outputs, the resolving address of the cell will be set to the input of the memory block 4. The information output of block 4 of the memory from the cell will receive a code corresponding to the pressed key, the first output is the signal of the set Readiness bit, the second is the signal of an unspecified

Bit Error. The signal from the first output of memory block 4 through the NOT 6 element will allow operation of the generator 7 and counter 8, through the I 13 element will remove the inhibit signal from the trigger 11 and

closes element 14, the signal from the second output of memory block 4 will prohibit the element, and 15o the counter 8 and the decoder 9 will form a recording pulse, which from the output of the de- encoder 9 will go to the inputs of the trigger 10 and 11, to the inputs of the elements 14 and 15 and opens the input of the record of register 5. At the outputs of the register 5 tb-vitas, the information rewritten from the outputs of block 4 of memory is on the leading edge of the pulse. Triggers 10 and 11 are set on the falling edge of the write pulse, while the signal from the output of trigger 10 blocks the operation of generator 7 and goes to the output Ready.

device, and the signal from the trigger 11. also blocks the operation of the generator 7 and resets the counter 8.

After reading the information from the device on the Ready signal to

the output of the device, the trigger 10 is reset on the Reset device input. The signal of the opposite value from the output of the trigger 10 will go to the Device Ready output and allow the generator 7, which is disabled by the signal from the trigger 11 output. After releasing the key from the first output of the memory block 4, the Readiness signal is removed, and

the NOT 6 element blocks the operation of the generator 7 and the counter 8. Through the delay element 16 and the AND element 13, the trigger 11 is reset, the output of which gives the enabling signal to the previously blocked generator 7 and the counter 8. As a result, the device returns to its original state.

In the event that an interference signal arrives at the input of memory block 4, then a forbidden address of the cell from which information is read out with the unset Ready bit is formed at the input of this block. In this case, if the write pulse is not generated by the counter 8 and the decoder 9, the circuit will come to its original state by blocking the generator 7 and resetting the counter 8 through the NOT element 6. If the recording pulse is generated, then trigger 12 through the And 14 element or 15, an Error signal is recorded, which goes to the corresponding output of the device.

If information from the device is not read, and the key is released and the next is pressed, the generator 7 will be blocked by a signal from trigger 10 until the information is read and the trigger 10 is cleared by the Reset input signal. Only after that the information corresponding to the pressed key will be displayed.

When two keys are pressed simultaneously, the forbidden cell address of the memory block 4, in which the Readiness bit is not set, is generated at the input of memory block 4.

In this case, the device does not output information of this cell and returns to the initial state. Thus, it is possible to work with overlapping keys, i.e. when the first key is pressed, the second key is pressed and the first is released, the information corresponding to the first and second keys will be successively displayed.

Claims (1)

Invention Formula  An information input device comprising a keyboard, a memory unit, a register, a pulse generator, the first trigger and the first element I, the keyboard outputs are connected to the inputs of the memory block, the outputs of the group of which are connected to the inputs of the register group 5, the outputs of which are formational Outputs of the device, characterized in that, in order to increase reliability, the second and third triggers are introduced into it8 O. The decoder, the counter, the second and third elements AND, the element NOT, the delay element, the first output of the memory block is connected to the second input of the second element AND, the input of the element NOT, the input 5 of the first element And through the delay element with the second input of the first element And, the second output of the memory block is connected to the second input of the third element And, the outputs of the second and third elements And are connected to the first and the second inputs of the third trigger co. responsibly, the output of the third trigger is the output of the device error, the output of the first element I is connected to the second input of the second trigger, the output of which is connected to the second input of the counter and the third input of the pulse generator, the output of which is connected to the third input of the counter 0 and the decoder input, the counter outputs are connected to the inputs of the decoder group, the output of which is connected to the first input of the first trigger, the first inputs of the second and third elements And the second trigger and the register input, the output of the element is NOT connected to the second input of the pulse generator and the first input of the counter, the output of the first trigger is connected to the first input of the pulse generator and is the Device Ready output, the second input of the first trigger, and the third input of the third Vl trigger. - are input Reset device. b / uHtp Lee., , tomo8Mycin Kykh., Oshi8no Editor V.Danko Compiled by A. Trunov Tehred A. Kravchuk Proofreader A.Zimokosov Order 264/46 Circulation 673 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4