CIE AS Computer Science Ports

what does USB stand for

universal serial bus

how many bits are transferred at a time when connecting a device using USB

1 bit is transferred at a time

In a USB, is data transmitted at a steady rate where transmission is synchronised between the computer and the device or is there communication based on what is happening in the device or the computer?

Data transmission can be synchronous or asynchronous

Is USB transmission two-way or one-way communication?

USB-3 transmission is full duplex, earlier USB versions are half-duplex

What is an advantage of USB-enabled devices?

They are automatically recognised by computers, which loads the corresponding device driver

What does HDMI stand for?

high-definition multimedia interface

What is the function of HDMI?

It allows audio and video output from a computer to a display device

What does HDMI transmit?

HDMI transmits digital, high-definition signal

What is HDMI a replacement for?

it is the digital replacement for analogue VGA

What does VGA stand for?

video graphics array

What is VGA?

An analogue method for connecting computers to displays

What are the disadvantages of VGA compared to HDMI?

It has a lower refresh rate (the image on the screen is changed less frequently), it has a fewer number of pixels (worse definition of images), it has a fewer number of colours