SU1493997A1 - Device for data input - Google Patents

Abstract

The invention relates to automation and computing and can be used to manually enter information into processing devices. The aim of the invention is to improve the speed of the device. The device for entering information contains a keyboard 1, a multiplexer 2, an element NOT 7, a trigger 8, a first 6 and a second 11 elements OR, a pulse generator 3, an element AND 4, an EXCLUSIVE OR element 12. By reducing the input time of frequently used characters, for example , the keys "0" and "SPACE" provides an increase in the speed of the device. 1 il.

Description

The invention relates to automation and computing and can be used to manually enter information into processing devices.

The purpose of the invention is to increase the speed of the device.

Pa drawing shows a block diagram of the device.

The drawing shows the keyboard 1, made in the form of switching elements, including movable, normally closed and normally paSoM-whip contacts, multiplexer 2, 3 pulse generator, element 4, counter 5, first element OR 6, element 7 and trigger 8, information outputs of the device 9, the output readiness of the device 10, the second element OR II, the element EXCLUSIVE OR 12.

The device works as follows.

Let the first input of the second element OR 11 be connected to the information input of multiplexer 2, corresponding to the unit state of counter 5, which corresponds to a key, for example, the keyboard I SPACE, the second input to the information input of multiplexer 2, corresponding to the zero state of counter 5 and the O key, and the output of the second element OR 11 is connected to the zeroing input of the counter 5.

In the initial state, when none of the keys of the keyboard 1 is pressed, all selectable inputs of multiplexer 2 contain logical O, its output contains logical 1, which through the NOT 7 element of the logical O holds the trigger; 8 in the unit state, while the logical 1 from the direct output of the trigger 8 permits the passage of clock pulses from the generator 3 through the element 4 to the counting input of the counter 5, at the output of which 2 codes appear sequentially. At the same time, at the input of the installation in O of the counter 5 there is a logical O, I allow

QD 00 WITH CO

the last counting of pulses, at the second inputs of the EXCLUSIVE OR 12 elements, logical O are present, as a result of which the 9 combinations of the device receive code combinations from the outputs of counter 5 in a straightforward form.

When any key 1 is pressed (except SPACE and O), logical 1 is fed to the corresponding selectable input of multiplexer 2. At the time when the output of counter 5 sets the code corresponding to the key number pressed, the output of multiplexer 2 forms a logical 0 arrives at the first input of the first element OR 6 and through the element NOT 7, drop the logical 1 - to the S input of trigger 8, without changing its state.

When the moving contact reaches the normally open contact of the key at the second input of the first element OR 6, a logical O appears, which, arriving at its input, sets the trigger 8 via the R input to the zero state. At the same time, the logic about the output of the trigger 8 prohibits the passage of clock pulses from the output of the generator 3 through the element AND to the counting input of the counter 5, and the logical 1 from the inverse output enters output 10 of the device, polling the outputs of group 9 devices, i.e. key code.

When the moving contact returns to the normally closed contact of the keyboard key I, the output of the multiplexer 2 is set to logical 1, which sets the trigger 8 to the one state via the NOT 7 element. The circuit returns to its original state.

When you press the SPACEBAR on the corresponding code combination, all units are the input of multiplexer 2, the second inputs of the elements are EXCLUSIVE

OR 12 groups and the first input of the second element OR 11 enters logical 1, setting counter 5 to the zero state. Pa outputs of the EXCLUSIVE RSHI group 12 elements are used to set the combination of all units, which go to the outputs 9 of the device group and the address inputs of the multiplexer L, the output of which forms the logical O, Logical 0

5 0 5

0 5

0

five

Who is at the second input of the first element OR 6 (when the movable contact of the SPACEBAR of a normally open contact is reached) the trigger B is set to the zero state, at which the clock pulses to the counting input of the counter 5 stop, and the output 10 of the device appears logical 1 , solv- ing polling of the outputs of the 9th group of the device.

When the moving contact returns to the normally closed circuit, the circuit returns to its original state.

When pressed, the best O device works in the same way as when using the SPACE key, but the null code combination from the outputs of counter 5 goes through the elements ORTIVE OR 12 groups to the outputs 9 groups of the device without inverting (in direct form).

Thus, the device allows to increase the speed of input of information by reducing the time (up to the response time of the circuit elements) of inputting frequently used symbols.

Claims (1)

Invention Formula A device for entering information containing a keyboard, a multiplexer, a pulse generator, an AND element, a counter, the first OR element, a NOT element and a trigger, the keyboard group outputs are connected to the multiplexer information inputs, the output of which is connected to the element input and the first input of the first element OR The output of which is connected to the installation input of the trigger, the inverse output of which is the device ready output, the output of the element is NOT connected to the installation input of 1 trigger, the direct output of which is connected to the first input the house of the element And, the second input of which is connected to the output of the pulse generator, the output of the element AND is connected to the counting input of the meter, the output of the keyboard is connected to the second input of the first element OR, which is aimed at increasing the speed of the device, it introduced the second element SHIII and the EXCLUSIVE OR element, the outputs of which are connected to the address inputs of the multiplexer and are informational outputs of the device, the outputs of the counter are connected to the first inputs of the corresponding elements of IC1CHCHIURYE ORE, one of Exit group keyboard connected to perU93997 mi b input of the second element OR, another output of the keyboard group is connected to the second inputs of the second element OR and the elements EXCLUSIVE OR.