System for revision line retrieval

Abstract

Abstract A system for locating a retrieving a particular line of text stored in a shift register memory. The system includes an input/output typewriter in electronic association with a dynamic shift register and two one-character registers. One of the onecharacter registers is a query register and the other a hold register. A line of text stored in memory along with other lines is located for printout and revision by entering a search mode and keying query characters representative of a revision point in the line. The revision point can be a misspelled word. A keyed query character representative of the first character making up the revision point is input into the query register. When matches among corresponding characters are found in memory they are replaced with match flags. These match flags define the next characters in memory which are to be compared with the next keyed query character. Spaces define the next characters in memory when the search mode is entered. After the second query character is keyed it is held in the query register and the first keyed character is transferred to the hold register. The match flags in memory are then sequentially replaced with the first keyed character from the hold register and the character following each of the replaced match flags is compared with the second keyed character held in the query register. When matches again occur, the matched characters are replaced with match flags. This operational sequence continues until terminated by the operator, whereupon an operation flag existing in memory is repositioned at the beginning of the first line containing at least one match flag and that line is printed out.

Inventors

• 👤 J Greek
• 👤 H Tanner

Bibliographic Details