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IP.com Disclosure Number: IPCOM000079432D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 3 page(s) / 41K

Publishing Venue

IBM

Related People

Kolpek, RA: AUTHOR

Abstract

Typewriter 10 is interconnected through control logic circuitry 11 to a memory device 12, that provides storage location 13 corresponding individually to print positions along the writing line 14 of a typing page 15. An appropriate memory including memory controls is shown in U.S. Patent 3,618,032 and provides storage for a full page of text. In normal operation, text keyed on keyboard 16 is printed on page 15 and is also transmitted through line 17 and logic 11 to a storage location 13 indicated by memory access controller 19, which can be directly controlled by the position of typing element 20. Information thus stored in memory 12 can be read back through control logic 11 and conduit 18 to operate the typewriter 10, to reproduce the information originally keyed, if desired. FLUSH RIGHT.

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Typewriter 10 is interconnected through control logic circuitry 11 to a memory device 12, that provides storage location 13 corresponding individually to print positions along the writing line 14 of a typing page 15. An appropriate memory including memory controls is shown in U.S. Patent 3,618,032 and provides storage for a full page of text. In normal operation, text keyed on keyboard 16 is printed on page 15 and is also transmitted through line 17 and logic 11 to a storage location 13 indicated by memory access controller 19, which can be directly controlled by the position of typing element 20. Information thus stored in memory 12 can be read back through control logic 11 and conduit 18 to operate the typewriter 10, to reproduce the information originally keyed, if desired. FLUSH RIGHT.

To format text with a flush right margin, for example typing element 20 is positioned at the margin 22 and mode key 21 is depressed. Memory access controller 19 initially designates a memory location 13 corresponding to the margin position 22. The text to be typed is keyed by the operator on keyboard
16. Depression of key 21 has, however, conditioned the typewriter 10 for nonprint and backspace operation through mechanism that can be, for example, like that disclosed in U. S. Patent 3,618,736. The code representing the character keyed, is placed into the memory location 13 originally identified by the memory access controller 19 as the right margin position. That code and all character indicating codes recorded following depression of key 21 are shifted to one lower order memory address, to maintain alignment of the leftmost character keyed with the backspaced type element 20. Control of the shift operation of character codes in memory 12 can be accomplished through techniques like those used in the aforesaid U.S. Patent 3,618,032 to perform a one-character space "close" operation. During this operation, memory access controller 19 is not controlled by changes in the print position of type element 20, but remains at the right margin position.

After the complete line segment has been keyed, the operator strikes playback control key 23 to return memory access register 19 into alignment with the then current print position of type element 20. In this condition, memory access controller 19 will identify the first keyed character code stored in memory 12 and will direct a series of print operations through logic 11, to cause printout of the previously keyed information. After a full line of text has been keyed, the information stored in memory 12 can be recorded, if desired, through mechanism 24 onto a tape or other removable media record 25 for later playback. Those storage locations in memory 12 which bear no information can be recorded as "word space" or, alternatively, can be counted and encoded for numerical tab control. If desired, the function of playback control key 23 can be incorporated in field changing keys such as line re...