ANSI INCITS 41 : 1990

1 Introduction
2 General
2.1 Scope
2.2 Purpose
2.3 Application
2.4 Conformance
3 Definitions
4 Notational conventions
4.1 General
4.2 Character representation
4.3 Character notations
5 Extension of the 7-bit code remaining in a 7-bit
     environment
5.1 Introduction
5.2 Extension of the graphic set by means of the shift-
     out and shift-in characters
5.3 Code extension by means of escape sequences
5.4 Pictorial and tabular representations
6 Structure of a family of 8-bit codes
6.1 General
6.2 The 8-bit code table
6.3 The family concept
7 The use of code extension in an 8-bit code
7.1 General
7.2 Defining an 8-bit code
7.3 Code extension by means of escape sequences
7.4 Pictorial representation
8 Announcement of extension facilities used
9 Relationship between 7-bit and 8-bit codes
9.1 Transformation between 7-bit and 8-bit codes
9.2 Representation of the 7-bit code in an 8-bit
     environment
9.3 Representation of positions 10/0 and 15/15 in a
     7-bit environment
10 Specific meaning of escape sequences
Tables
1 Summary of assignments of three-character escape
     sequences
2 Announcer sequences and meanings
Figures
1 The structure of the 7-bit code
2 Structure for the extended 7-bit code
3 Schematic illustration of the shift-out and shift-
     in concept
4 Portions of the code table used in two-character
     escape sequences
5 Portions of the code table used in three-character
     escape sequences
6 The multiple-byte G0 set
7 7-bit code extension structure using C0, C1, G0,
     and G1 sets
8 The 8-bit code table
9 8-bit code extension structure using C0, C1, G0,
     and G1 sets
10 Pictorial representation of the announcer
     facilities
Appendices
A Implementation considerations
A1 Appearance of control characters in escape
     sequences
A2 Interactions when operating in multiprogramming and
     multiprocessing environments
A3 Unique interchange by prior agreements
A4 System startup and restart
A5 Future work on code extension
A6 Additional invokers and announcers
B Illustration of implementation
B1 General
B2 Structure
B3 Interpretation
B4 Transformation
Appendix Tables
A1 Suggested validity of communication control
     characters in sequences
A2 Future announcers
B1 Index to figures of appendix B
B2 Meaning of flowchart symbols
B3 Items used in the flowcharts
Appendix Figures
B1 7-bit code extension structure using C0, C1, G0,
     and G1 sets
B2 8-bit code extension structure using C0, C1, G0,
     and G1 sets
B3 Composite 7-bit and 8-bit code extension structure
     using C0, C1, G0 and G1 sets
B4 Interpretation of 7-bit data with C0, C1, G0 and
     G1 sets
B5 Interpretation of 8-bit data with C0, C1, G0 and
     G1 sets
B6 Interpretation of 7-bit and 8-bit data with C0, C1,
     G0 and G1 sets
B7 Transformations from 7 bits to 8 bits including C0,
     C1, G0, and G1 sets
B8 Transformations from 8 bits to 7 bits including C0,
     C1, G0, and G1 sets

Explains methods of extending the 7 bit code remaining in a 7 bit environment of increasing to an 8 bit environment. The description of techniques is specified in four interrelated sections.