atâ¢eâ¢lecâ¢taâ¢sis. 1. incomplete expansion of the lungs at birth, as from lack of breathing force. 2. collapse of the lungs, as from bronchial obstruction. atel(á¸s) incomplete (a-a- 6 + -telÄs, adj. derivative of telos tÃ©los, end) + completion ektasis]. Ã©ktasis extension
Serial Port. Even though the communication in PS/2 and USB is serial, technically, the term Serial Port is used to refer the interface that is compliant to RS-232 standard. There are two types of serial ports that are commonly found on a computer: DB-25 and DE-9.
A typical host PC might have two USB 2.0 ports and two USB 3.0 ports. The USB 2.0 ports might be used for a USB keyboard and USB mouse, but the user may have far more than two additional USB devices to connect to the PC at the same time, and many of those might be capable of USB 3.0 operation.