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The VT100 was a computer video terminal developed by Digital Equipment Corporation (DEC) and introduced in August 1978. It was among the first terminals to fully support ANSI escape codes to control the cursor and do other tasks. It also had special extended codes for other special features such as those that controlled the various LED lamps on the keyboard. Starting with the VT100, the VT series of terminals became very popular, leading to the rapid uptake of the ANSI standard, which then made it the de facto standard used in terminal emulators.
The VT100 was the first terminal in DEC's VT terminal line that became popular, starting from its introduction in 1978. The terminal communicated with its host computer system through serial lines using the ANSI character set and control sequences. The VT100 did many things first. As mentioned earlier, it was among the first to make use of ANSI as a standard for character input; it was also the first terminal to use "graphic renditions" for things like blinking, bolding and underlining, and reverse video on par with 80 or 132 column displays; and, finally, it was the first of DEC's terminals to be based on an industry standard microprocessor, the Intel 8080. Because of this, it became the platform upon which DEC would construct other products.
Some VT variants include: