![]() Default code sets were capable of upper and lower case.This generation of systems, nowadays mostly summarized as 'Minis', 'felt' several issues: Then there came along a generation of programmers that first used the lowest cost devices possible - teletypes - and thus got used to the look - except to the computer, everything typed was upper case. ![]() People continued with upper-case this out of habit, but also as.On a mainframe side, using upper-case remained supported by (optional but default) automatic conversion.Development varied on machines, thus there is no specific point in time.īut there are maybe a few additions more to habit and psychology. when assemblers started to be case-insensitive.īoth of this depends on hard-/software development, including the adoption of codes providing lower case at all and OS input routines no longer uppercasing everything entered by default.I guess the most important point has already been touched by Will's answer: When did Assembly code begin being written in lowercase? If restricted to a single case, western (Latin) cultures used to fall back to Roman times by using upper case only (*1). Also, with each generation, systems usually start out with only one case. I guess there is no straight answer, as it's a fuzzy move spread across a long time, many machines, OSes and applications.
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