Browse Prior Art Database

Program for Detecting a Font Change in a Stream of Text Characters

IP.com Disclosure Number: IPCOM000073645D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Norton, HT: AUTHOR [+2]

Abstract

For text processing, the normal code structure of a system, which is 6, 7, or 8 bit, is inadequate to uniquely identify all of the graphic forms that it may be necessary to represent. The above program utilizes an escape mechanism for the purpose of specification of type font changes or unique graphic forms or for the prefixing of special character sequences, such as ligatures and fractions.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 68% of the total text.

Page 1 of 2

Program for Detecting a Font Change in a Stream of Text Characters

For text processing, the normal code structure of a system, which is 6, 7, or 8 bit, is inadequate to uniquely identify all of the graphic forms that it may be necessary to represent. The above program utilizes an escape mechanism for the purpose of specification of type font changes or unique graphic forms or for the prefixing of special character sequences, such as ligatures and fractions.

To signal the escape mechanism, the operator at a keyboard terminal could utilize the backspace key. In the case of a font change, the character preceding the escape character would signify that a font change is being requested. The preceding character could be, for example, a left parenthesis. The character following the escape character would identify the font being selected. The association between characters following the escape character and fonts to be called must have been previously established.

By retaining the identity of the font previously in use, this previous font may be reselected by preceding the escape character with an appropriate keyboard character, as, for example, a right parenthesis.

When the escape character is used to prefix a special character sequence, the pair of characters before and after the escape character indicate the type of sequence, such as ligature or fraction. The succeeding characters are recoded to a single special graphic, depending on the characters themselves.

When th...