KR930001739Y1 - Executing speed displaying circuit of computer - Google Patents

Abstract

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Description

Speed display circuit of computer

1 is a conventional circuit configuration diagram.

2 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

2: decoding logic 3: D flip flop

4: Inverter

The present invention relates to a performance display circuit of a computer, and more particularly, to a performance display circuit of a computer realized by configuring only a simple logic circuit without using a keyboard controller.

In general, the appearance of the personal computer displays the current computer running speed with an LED or the like so as to know from the outside, and for example, a circuit for converting the turbo / dutterbo (the turbo means a faster running speed than the dither) mode may be any I. It is possible to change the bit value in the / O (input / output) address. That is, a signal for controlling the lighting and blinking of the LED used as the display device is provided by the keyboard controller.

As shown in FIG. 1, the keyboard controller 1 uses the output of one of the output terminals according to the application of the I / O address signal, data signal, and I / O read or write control signal to the keyboard controller 1. If it is '1', if it is ditherbo, it outputs '0' signal so that the other terminal is lit or blinking.

That is, in the conventional technology configured and operated as described above, when the power is turned on for the use of the computer, the turbo / ditorbo output of the keyboard controller 1 maintains the default value (the value already specified in the computer). If you specify this when you want to change the running speed, the LED turns on or blinks according to the changing run speed as described above.

In addition to basic input devices such as keyboards, computers can use various peripheral devices as needed. Recently, computers such as PS / 2 mice are increasingly being installed in computers.

In this case, when the keyboard controller 1 supports only the keyboard, there was no Kunze, but when the mouse supports the keyboard, the output pins are limited depending on the logic design. There was a case.

That is, it is necessary to use one of the output pins of the keyboard controller 1 to drive the LED for displaying the performance speed. However, it is preferable to display the performance speed with only a simple logic circuit by eliminating this limited element.

That is, an object of the present invention is to provide a performance display circuit of a computer that realizes the computer speed using a conventional keyboard controller without simple keyboard controller.

In order to achieve the above object, the present invention is a performance speed display circuit having a display device, comprising: decoding logic for receiving an address signal and an I / O write signal and tooling a clock signal, and outputting the decoding logic as a clock signal. A D flip-flop which receives a data signal relating to a turbo or a turbo and outputs a drive signal for driving the display device; and inverts the display device drive signal of the D flip-flop to drive the display device. It is composed of an inverter, characterized in that the other end of the display device is connected to a power source.

A circuit constructed to achieve the object of the present invention is shown in FIG.

The circuit of the present invention has an address signal and an I / O signal as shown in FIG. ), And outputs a signal for driving the LED display device by receiving the decoding logic 2 for outputting a clock signal and the output of the decoding logic 2 as a clock signal, and inputting a data signal for turbo or diturbo as input. An inverter which inverts the D flip-flop 3 and the drive signal output of the D flip-flop 3 to drive the LED, i.e., to drive the LED; 4) consists of.

The present invention operation of this configuration will be described.

According to the user's request, if there is a performance speed conversion instruction, the address and I / O write signals ) Is applied to the decoding logic 2 of the present invention, and at the same time, "1" or "0" is input to the input terminal D of the D flip-flop 3 according to the turbo or the turbo.

For example, the addressing is accomplished by the specification of a computer's unused I / O address, whose address is 29H (00101001) in hexadecimal representation, and the bit value written through this port is logical '1'. This address detection then decodes the decoding logic in decoding logic (2). The output is used as the clock signal of the D flip-flop 3.

The D flip-flop 3 then outputs 1 'as the drive signal if the turbo data signal, i.e., " 1 " is input to the data input D while the clock signal is applied. This drive signal is inverted by the inverter 4 so that the other terminal is applied to the LED connected to the power supply Vcc and thus the LED is turned on. Of course, when the dither signal is input to the flip-flop 3, the output Q becomes '0' and the LED is turned off.

As described above, this design consists of a simple logic circuit, so that not only the performance speed display but also the pin utilization of the keyboard controller can be used, for example, the use of the PS / 2 mouse mentioned above can be used together with the computer performance speed display.

Claims (1)

In a performance display circuit of a computer having a display device (LED), an address signal and an I / O write signal ( And a decoding logic 2 for outputting a clock signal, and the output of the decoding logic 2 as a clock CLK signal. D flip-flop (3) for outputting a drive signal for driving () and an inverter (4) for driving the display device (LE) by inverting the display device drive signal by the D flip-flop (3), And the other end of the display device (LED) is connected to a power supply (Vcc).