A-A-890C
TYPEWRITER KEYBOARD ARRANGEMENT
1. Scope
This description defines the arrangement of the 44 basic printing keys on the typewriter and the characters, uppercase and lowercase, that appear on the keys. It also includes the two shift keys and the space bar. However, the description does not specify the physical characteristics and dimensions of the keys and keyboard. It relates to the keyboard arrangement only.
2. Definitions
In this description, the following definitions shall apply:
Alphabetic. Pertains to the letters in an alphabet.
Alphanumeric. Pertains to the alphabet and numerals that comprise a complete set for a particular language.
Case. A group of characters similarly positioned with respect to the shift.
Functional key. The key on the machine, which, when activated, produces a machine action other than a printing impressions, such as space, shift, backspace, etc.
Key (key top, key button). A finger-contract, the activation of which results in a machine response.
Keyboard. The area of a machine on which the printing and functional keys are arrayed.
Keyboard arrangement. The position of the keys relative to one another and the arrangement of characters on them.
Lowercase. A group of characters, usually containing the small alphabet, numerals, and certain symbols that are printing position with the shift key in its customary position (not depressed).
Numeric. Pertains to Arabic numbers.
Printing key. A key on the machine, the activation of which results in a printing impression.
Shift. The facility to change from one case to another.
Symbol. Any of the punctuation marks and signs used instead of a word or words to represent an operation, relationship, spoken sound, etc.
Uppercase. A group of characters, usually containing the capital alphabet and certain symbols that are brought into printing position by depressing the shift key.
3. Standard Keyboard Arrangements
3.1 Fig. 1 shows the standard arrangement of the keys and the characters assigned to them (including the two shifts keys and the space bar).
3.2 Fig. 1, the keys labeled with the letters of the alphabet are intended to produce lowercase letters in unshifted (lowercase) mode and uppercase letters in the shifted (uppercase) mode. The other keys are intended to produce the lower character as shown in the key in the unshifted mode, and the upper character as shown in the key in the shifted mode.
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