| RS-232
This was originally a nine-wire interface standard for teletype machines
from the Electronics Industry Association. Now in its third revision
(RS-232-C), it's the standard for computer serial-port transfers. The
RS-232 standard is probably the only computer component that's 40 years
old and still working. One wire is used as the ground; the rest are
dedicated to detecting carrier signals, managing the timing of data
transfer, oh, and sending and receiving data. |