![]() The mechanism was invented by Bob Bemer, the father of ASCII. ![]() Specifically, they used ASCII code 27 10 (escape), followed by a series of characters called a "control sequence" or "escape sequence". It quickly became possible and inexpensive to interpret sequences of codes to perform a function, and device makers found a way to send hundreds of device instructions. This was because early terminals had very primitive mechanical or electrical controls that made any kind of state-remembering API quite expensive to implement, thus a different code for each and every function looked like a requirement. There were quite a few control characters defined (33 in ASCII, and the ECMA-48 standard adds 32 more). Main article: C0 and C1 control codes ยง C0 controls
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