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IBM PC Coded Character Set Extension Technique

IP.com Disclosure Number: IPCOM000061496D
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Forte, RW Leikam, GE Metwaly, F Umamaheswaran, VS [+details]

Abstract

A method is described for extending the PC's coded character set capabilities, in order for applications to be able to share information and coexist harmoniously in multi-tasking/windowing environments, and be able to exchange information with other products. This is done in a non-disruptive manner to minimize migration problems and maximize compatibility with the massive base of existing applications. The PC code set is a unique version of 8-bit ASCII. This character set is sometimes referred to as code page 437. The left and right halves will be referred to as 437-1 and 437-2, respectively. The 94 characters in code points X'21' through X'7E' conform to the US 7-bit ASCII standard (ANSI X 3.4).