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Spelling Checking Typewriter

IP.com Disclosure Number: IPCOM000083777D
Original Publication Date: 1975-Jul-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Hackett, R: AUTHOR

Abstract

For this description a word is a string of characters ending with a space. The spelling checking typewriter 10 need not be connected to an IBM 'Selectric' MTST or IBM 'Selectric' Mag Card System 11, but it should be fully compatible with them. The data bus from the keyboard has a one-word buffer 12 on it, so that the word in the buffer can be checked against the dictionary 13 for correct spelling.

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Spelling Checking Typewriter

For this description a word is a string of characters ending with a space. The spelling checking typewriter 10 need not be connected to an IBM 'Selectric' MTST or IBM 'Selectric' Mag Card System 11, but it should be fully compatible with them. The data bus from the keyboard has a one-word buffer 12 on it, so that the word in the buffer can be checked against the dictionary 13 for correct spelling.

When the typist presses the Check push button 14, the microprocessor 15 compares the word in the buffer 12 with the dictionary 13 by addressing the dictionary based on the first three letters of the word, and make a list of all words from that area that have the same number of characters (some characters, such as hyphens, and line feeds, would need special handling for whether or not they are included in the spelling) plus or minus one character.

This list is then compared on a character-by-character basis (for that portion of the list that has the same number of characters as the word in the buffer 12) and if one compares equal, the Spelling OK lamp 16 is turned on. If the Blank push button 17 had been pressed previous to typing the word in the buffer 12, the actual typing of the word was inhibited and consequently when the Spelling OK lamp 16 is turned on, the word in the buffer 12 is automatically typed.

If there was not a compare equal and there is a compare list, the List lamp 18 will go on, and when the Check push button 14 is again pr...