DDC1 is a uni-directional data channel from the monitor to the CPU, which continuously transmits certain monitor data, such as the model number, serial number and resolution. DDC2B goes a step further to allow for bi-directional communication between the CPU and the monitor. This allows the CPU to send a specific request for information to the monitor for on-demand transmission of the information. Asset Control is the feature of Compaq monitors that provides this function. Degauss Adjusts the monitor for changes in the surrounding magnetic field.
Most monitors automatically degauss at power on.
A degauss button or control provides degauss without powering down. An indication of the need to degauss is the appearance of color irregularities on the screen, which can be caused by interference from other magnetic devices placed near the monitor. This tube is also shaped differently from a flat square tube, in that it is flat, rather than spherical, which aids in reduction of glare from overhead lighting. A measurement of distance between the centers of two same-color phosphor dots on the screen. The closer the dots, the smaller the dot pitch, and the sharper the image.