#what is AT port

We all might have hazy memory of this stuff, but ever wondered what are these ports for? Well, at some point I bet these common ports have served their purpose in the past, and surprisingly, some of these ports endured technological advancements still existing up to this date. See first the list of ports below then make your intelligent guesses on what they do.   LPT or “Line Print Terminal” is the logical name assigned to parallel port #1 in old PCs. A “parallel port” uses D-shaped 25-pin female connection that provides an interface of multiple wires to execute ‘parallel communication’ which means sending and receiving large bits of data simultaneously. This is not present in modern PCs anymore but back then, up to three parallel ports can be designated with LPT1 as default (consecutively LPT2, LPT3). Aside from printer communication, hard drives, CD drives, and compatible camera equipment were also utilizing this port. Parallel ports were the alternative to “serial ports” because of their faster data transmission speeds in a parallel fashion. Read more in our articles including "What are These Ancient PC Ports For?" and "Blogger-Friendly Airports".