摘要:
An apparatus for automatic testing of a PS/2 interface includes a micro controller unit, a PS/2 port, and a plurality of LEDs. The micro controller unit is coupled with both a data pin and a clock pin of the PS/2 interface. The LEDs coupled to the micro controller unit simulate functions of a keyboard. A related method for testing the PS/2 interface is also provided.
摘要:
An apparatus for automatic testing of a PS/2 interface includes a micro controller unit, a PS/2 port, and a plurality of LEDs. The micro controller unit is coupled with both a data pin and a clock pin of the PS/2 interface. The LEDs coupled to the micro controller unit simulate functions of a keyboard. A related method for testing the PS/2 interface is also provided.
摘要:
A method for testing a card reader includes the steps of: identifying a logical drive corresponding to the card reader; determining whether the card reader matches a portable storage device connected to the card reader; displaying error information if the card reader does not match the portable storage device; obtaining a control code of the portable storage device if the card reader matches the portable storage device; testing the performance of the card reader by means of reading and writing data in the portable storage device through the card reader according to the control code.
摘要:
A start-up circuit which decreases a start-up current and stabilizes running of a DC fan. The start-up circuit includes a digital-analog converter for convert a digital control signal from a control chip to an analog control signal, a voltage sampling device connected to an output terminal of the digital-analog converter, a comparator, a switching device for controlling start-up of the DC fan, and a feedback device adjusting current passing through the switching device. The comparator includes two input terminals and an output terminal. One input terminal is connected to an output terminal of the voltage sampling device. The switching device is connected to the output terminal of the comparator. An output signal of the switching device is inputted to the other input terminal of the comparator via the feedback device.
摘要:
A method for displaying debug codes of a BIOS includes the steps of: initializing a host electronic system and sending out a debug code corresponding to the initialization of the host electronic system to a debug card; displaying the debug code on an LED-display screen of the debug card; transmitting the debug code displayed on the LED-display screen to an application software; choosing the BIOS file corresponding to the debug code displayed, then acquiring and displaying the information via the application software. A system implementing this method includes a host electronic system with a BIOS for sending out a debug code during the initialization; a debug card connected electrically to the host electronic system for receiving and displaying the debug code sent out by the host electronic system; an application software for acquiring and displaying the information corresponding the debug code displayed on the debug card.
摘要:
A self-startup circuit for a DC fan includes a voltage sampling device receiving a first control signal, a comparator, and a self-startup device. The comparator includes two input terminals and an output terminal. One input terminal is connected to an output terminal of the voltage sampling device. The self-startup device has a switching device and a diode connected in parallel. The self-startup device has an input terminal connected to the output terminal of the comparator, and outputs a second control signal for keeping the DC fan rotating even when the first control signal has a very low duty cycle.
摘要:
A card for simulating peripheral component interconnect (PCI) loads is disclosed. The card in accordance with a preferred embodiment of the invention includes an interface configured for electrically connecting to a motherboard; and a load circuit for simulating the different loads, wherein the load circuit comprises at least one power module receiving a voltage from the interface; and the power module dissipates various loads. Because that the card may dissipates various power according to testing requirement, the stability of the motherboard can be tested in various load power without connecting actual PCI loads to the motherboard.
摘要:
A start-up circuit which decreases a start-up current and stabilizes running of a DC fan. The start-up circuit includes a digital-analog converter for convert a digital control signal from a control chip to an analog control signal, a comparator, a switching device for controlling start-up of the DC fan, and a feedback device adjusting current passing through the switching device. The comparator includes two input terminals and an output terminal. One input terminal is connected to an output terminal of the digital-analog converter. The switching device is connected to the output terminal of the comparator. An output signal of the switching device is inputted to the other input terminal of the comparator via the feedback device.
摘要:
A card for simulating peripheral component interconnect (PCI) loads includes an interface configured for electrically connecting to a motherboard and a load circuit configured for simulating the different loads. The load circuit comprises at least one power module receiving a voltage from the interface. The power module is capable of changing resistance of the power module thereby to thermally consume various powers to simulate the different loads. Because the card consumes various power according to testing requirement, the stability of the motherboard can be tested in various load power without connecting actual PCI loads to the motherboard.
摘要:
A pulse width modulation (PWM) generating circuit includes a first comparator, a first resistor, a second resistor, a third resistor, a fourth resistor, a capacitor, and a diode. The first resistor and the second resistor are connected in series between a voltage input and ground. The third resistor, the fourth resistor, and the capacitor are connected in series between the voltage input and ground. The first comparator has a non-inverting input connected to a node between the first resistor and the second resistor, an inverting input connected to a node between the fourth resistor and the capacitor, and an output connected to a node between the third resistor and the fourth resistor. The diode is connected between the non-inverting input and the output. The inverting input of the first comparator provides triangular wave signals to a second comparator by which PWM signals are generated.