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A coding system for a typewriter reserves certain individual bit positions of a set of operation-defining codes to indicate special functions such as paper insertion.
English (United States)
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Coding System For Permitting Simplified Typewriter Control Logic
A coding system for a typewriter reserves certain individual bit positions of a
set of operation-defining codes to indicate special functions such as paper
A grouping of eight bits is used to define printing control for selecting
respective characters, and a grouping of five bits is used to represent ordinary
functions such as backspace and carrier return (see figure). Using such a coding
system, control signals that relate to character printing or to ordinary functions
are represented using patterns of bits to achieve efficient coding (a set of
patterns of five bits can represent up to 32 functions rather than 5 as would be
the case if each bit corresponded to a function).
By indicating special functions such as paper insertion by individual
respective bits, these functions are easily tested, say to select a corresponding
programmed logic sequence, and a hierarchy among such functions may be
conveniently established based on testing of the respective bits. For example, a
"paper insert" bit might serve, when detected in a particular state, to cause a
"case shift" bit to be ignored and might also serve to cause the ordinary-function
bit pattern to be interpreted as corresponding to respective operator-selected first
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