Chorded keyboard (a writing system for the blind) uses either 6 or 8 tactile 'points' from which all letters and numbers are formed. When Louis Braille invented it, it was produced with a needle holing successively all needed points in a cardboard sheet. In 1892, Frank Haven Hall, superintendent of the Illinois Institute for the Education of the Blind, created the Hall Braille Writer, which was like a typewriter with 6 keys, one for each dot in a braille cell. The Perkins Brailler, first manufactured in 1951, uses a 6-key chord keyboard (plus a spacebar) to produce braille output, and has been
King of the Dot Dot battle is usually a set of three rounds. There are varying round times, between 60 seconds and 3 minutes. The rules are not overall that strict and rappers are frequently allowed to stretch beyond the time limits, as was showcased in Dizaster's battle with DNA (co-hosted by Drake). KOTD magazine is available to be read online on the official King of the Dot Entertainment website. There is also an option to order the magazine in hard copy. There have been six issues released to date. The magazine has articles discussing past events, interviews with various rappers and much more.