Editing IBM PC keyboard (section)

===From mechanical typewriters===
*{{key press|[[Shift key|Shift]]}} selects the upper character, or upper case of letters. The Shift key in typewriters was attached to a lever that moved the character types so that the uppercase characters could be printed on the paper. Unlike mechanical typewriters, PC keyboards do not capitalize all letters properly when both shift keys are engaged simultaneously.{{Citation needed|date=April 2016|reason=Does it really not capitalize correctly when both shift keys are pressed?}}
*{{key press|[[Caps Lock]]}} selects upper case, or if shift is pressed, lower case of letters. In mechanical typewriters, it worked like the Shift key, but also used a lock to keep the Shift key depressed. The lock was released by pressing the Shift key.{{Citation needed|date=April 2018|reason=It could have derived from TTY Lock, instead of Shift Lock}}
*{{key press|[[carriage return|Enter]]}} wraps to the next line or activates the default or selected option. ASCII keyboards were labeled CR or Return. Typewriters used a lever that would return the cylinder with the paper to the start of the line.
*{{key press|[[Tab key|Tab]]}} produces an ASCII [[tab character]], moving to the next tab stop.