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were restricted to upper-case (capitals).

The Tektronix 4013 Computer Display Terminal is a Tektronix 4010 with both the APL and ASCII character sets. There is a rocker switch above the keys to select the character set.

Commercial availability

The first APL interactive login and creation of an APL workspace was in 1966 by Larry Breed using an IBM 1050 terminal at the IBM Mohansic Labs near Thomas J. Watson Research Center,

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