The VGA interface includes no affordances for hot swapping, the ability to connect or disconnect the output device during operation, although in practice this can be done and usually does not cause damage to the hardware or other problems. They are often used in schools, businesses, and homes when multiple monitors are being run off one VGA port, or if the cable between the monitor and the computer will be excessively long (often pictures appear blurry or have minor artifacts if the cable runs too far without an extender). VGA carries just analog, so going from VGA to DVI requires a converter to change those analog signals to digital. One common variety is a DVI to VGA adapter, which is possible because many DVI interfaces also carry VGA-compatible analog signals.

What Is VGA? (Definition of Video Graphics Array) - Lifewire

While shorter VGA cables are less likely to introduce significant signal degradation, good-quality cable should not suffer from signal crosstalk (whereby signals in one wire induce unwanted currents in adjacent wires) even at greater lengths. All VGA connectors carry analog RGBHV (red, green, blue, horizontal sync, vertical sync) video signals.providing a higher quality connection with less crosstalk [10] by utilising five separate 75 ohm coaxial cables. Some high-end monitors and video cards used multiple BNC connectors instead of a single standard VGA connector, [ which? In both its modern and original variants, VGA utilizes multiple scan rates, so attached devices such as monitors are multisync by necessity. Within a 15-pin connector, the red, green, and blue signals (pins 1, 2, 3) cannot be shielded from each other, so crosstalk is possible within the 15-pin interconnect.

VGA connector - Wikipedia

Adapting from HDMI or DisplayPort to VGA without an active converter is not possible because those connectors don't output analog signals.The IBM PS/55 Display Adapter redefined pin 9 as "+12V", which signals the monitor to turn on when the system unit is powered on. This cable goes from the monitor to the computer, where it's met with a female connection from the video card. In the original IBM VGA implementation, refresh rates were limited to two vertical (60 and 70Hz) and three horizontal frequencies, all of which were communicated to the monitor using combinations of different polarity H and V sync signals.