• Source: Lotus Multi-Byte Character Set

The Lotus Multi-Byte Character Set (LMBCS) is a proprietary multi-byte character encoding originally conceived in 1988 at Lotus Development Corporation with input from Bob Balaban and others. Created around the same time and addressing some of the same problems, LMBCS could be viewed as parallel development and possible alternative to Unicode. For maximum compatibility, later issues of LMBCS incorporate UTF-16 as a subset.
Commercially, LMBCS was first introduced as the default character set of Lotus 1-2-3 Release 3 for DOS in March 1989 and Lotus 1-2-3/G Release 1 for OS/2 in 1990 replacing the 8-bit Lotus International Character Set (LICS) and ASCII used in earlier DOS-only versions of Lotus 1-2-3 and Symphony. LMBCS is also used in IBM/Lotus SmartSuite, Notes and Domino, as well as in a number of third-party products.
LMBCS encodes the characters required for languages using the Latin, Arabic, Hebrew, Greek and Cyrillic scripts, the Thai, Chinese, Japanese and Korean writing systems, and technical symbols.




Encodings


Technically, LMBCS is a lead-byte encoding where code point 00hex as well as code points 20hex (32) to 7Fhex (127) are identical to ASCII (as well as to LICS).
Code point 00hex is always treated as NUL character to ensure maximum code compatibility with existing software libraries dealing with null-terminated strings in many programming languages such as C. This applies even to the UTF-16be codes, where code words with the form xx00hex are mapped to private-use codes with the form F6xxhex during encoding in order to avoid the use of NUL bytes, and to escaped control characters, where 20hex is added to the C0 (but not C1) control characters following the 0Fhex lead byte.
Code points 01hex to 1Fhex, which serve as control codes in ASCII, are used as lead bytes to switch the definition of code points above 7Fhex between several code groups (similar to code pages) and at the same time determine either a single- or multi-byte nature for the corresponding code group.
For example, code group 1 (with group byte 01hex) is almost identical to the SBCS code page 850, whereas code group 16 (with group byte 10hex) is similar to the Japanese MBCS code page 932. Multi-byte characters can thus occupy two or three bytes.
In canonical LMBCS, each character starts with its group byte.
To reduce the length, in optimized or compressed LMBCS a default code group or optimization group code can be defined on a per application or process basis (ideally chosen according to the highest likelihood of occurrence) and must be communicated to the interpreting code in some way (f.e. by specifying the corresponding "LMBCS-n" name). Thereby, the group byte can be omitted for these characters. Lotus 1-2-3 retrieves the optimization group code from the file header of the corresponding source file, whereas for Lotus Notes the optimization group code is fixed to be always 01hex.




Character set


Without prefix byte the code points 32 (20hex) to 127 (7Fhex) are interpreted as follows (corresponding to LMBCS codes 32 to 127):




= Group 1

=
LMBCS group 1 code points 128 (80hex) to 255 (FFhex) are identical to the corresponding code points in code page 850 (DOS Latin-1), whereas code points 1 (01hex) to 127 (7Fhex) are defined according to the following exception list (corresponding to LMBCS codes 256 to 383):




= Group 2

=
LMBCS group 2 code points 128 (80hex) to 255 (FFhex) are identical to the corresponding code points in code page 851 (DOS Greek), whereas code points 1 (01hex) to 127 (7Fhex) are defined according to the following exception list:




= Group 6

=
LMBCS group 6 code points 128 (80hex) to 255 (FFhex) are identical to the corresponding code points in code page 852 (DOS Latin-2), whereas code points 1 (01hex) to 127 (7Fhex) are defined according to the following exception list:




See also


Compose key
GB 18030
Standard Compression Scheme for Unicode (SCSU)
Symbol (typeface)
Xerox Character Code Standard (XCCS)




Notes






References






Further reading


Born, Günter [in German] (December 2000) [1990]. "Kapitel 2. LOTUS 1-2-3-Format (WK3)" [Chapter 2. Lotus 1-2-3 WK3 format]. Dateiformate – Eine Referenz – Tabellenkalkulation, Text, Grafik, Multimedia, Sound und Internet [File formats – a reference – spreadsheets, text, graphics, multimedia, sound and internet] (PDF) (in German). Bonn, Germany: Galileo Computing. ISBN 3-934358-83-7. Archived (PDF) from the original on 2016-11-29. Retrieved 2016-11-28. (Includes some information about LMBCS and Lotus system ranges.)
"LMBCS tables". User's Guide – 123 Release 4 for Windows (Fax). Lotus Development. 1995 [1994-01-01]. CHAPTER: Appendix A Using the Lotus Multibyte Character Set. Fax 10955. Retrieved 2016-12-06.
"Entering LMBCS characters". User's Guide – 123 Release 4 for Windows (Fax). Lotus Development. 1995 [1994-01-01]. CHAPTER: Appendix A Using the Lotus Multibyte Character Set. Fax 10954. Retrieved 2016-12-06.
Lotus Support. "Notes from Support: SMTP MTA International Character Sets". IBM developerWorks. IBM. Archived from the original on 2016-12-08. Retrieved 2016-12-08.
Character Translation Files (.CTF) by Notes 2.x and Country Language Service (.CLS) files by Notes 3.0 and higher contain information about LMBCS translation into other codepages [2] [3]




External links


Berntrop-Bos, Lars (2014-07-10). "Blast from the past: LMBCS tables for Windows, OS/2, Unix and Macintosh". Archived from the original on 2016-11-26. Retrieved 2016-11-26.

Kata Kunci Pencarian:

• Lotus Multi-Byte Character Set
• Lotus International Character Set
• Variable-width encoding
• Lotus 1-2-3
• IBM Lotus SmartSuite
• Private Use Areas
• Lotus Symphony (MS-DOS)
• Compose key
• HCL Notes
• Digraphs and trigraphs (programming)