Browse Prior Art Database

Method of Tab Storage

IP.com Disclosure Number: IPCOM000081481D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Bowles, DJ: AUTHOR [+4]

Abstract

In a typewriter where tab stops are stored electronically in sequential order with the leftmost tab stop as the first tab stop, the electronics can store up to a set number of tab stops. By initially storing in these storage locations a tab stop value greater than the value of the rightmost carrier position on the longest possible writing line, the ascending order of tab stops may be maintained as in Fig. 1. If the carrier is positioned to the right of the rightmost tab stop and a tab is initiated, this initial value allows the carrier to escape to the rightmost position on the writing line. The storage locations retain this initial value until a tab stop is set.

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Method of Tab Storage

In a typewriter where tab stops are stored electronically in sequential order with the leftmost tab stop as the first tab stop, the electronics can store up to a set number of tab stops. By initially storing in these storage locations a tab stop value greater than the value of the rightmost carrier position on the longest possible writing line, the ascending order of tab stops may be maintained as in Fig. 1. If the carrier is positioned to the right of the rightmost tab stop and a tab is initiated, this initial value allows the carrier to escape to the rightmost position on the writing line. The storage locations retain this initial value until a tab stop is set.

Referring to Fig. 2, in setting a tab stop the storage locations are searched, beginning with the last storage location, until a tab stop value less than the present carrier position value is found. By searching from the last storage location to the first the tab stop values can be shifted up one storage location, to allow the insertion of the new tab stop value. In the shifting process the last storage location is shifted out and lost, so that the total number of tab stops remains constant.

In clearing a tab stop the storage locations are searched as in Fig. 3, beginning with the first storage location, until the tab stop value equal to the present carrier position value is found. By searching from the first storage location to the last, the tab stop values greater than the one to...