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C251 User's Guide
C251 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Error Messages Library Reference 
Appendix A. ANSI C Implementation 
Implementation-defined Behavior Compiler-Related Library-Related B. Version Differences Version 1.0 Differences C51 Version 5 Differences C. Writing Optimum Code Memory Model Variable Location Variable Size Local Variables Use 251 Source Mode Other Sources D. Compiler Limits E. Byte Ordering F. Hints, Tips, and Techniques Tips for Program Execution Tips for the Stack Tips for Interrupts Function Pointers Problems Using printf Uncalled Functions Trouble with bdata Tips for Porting C51 Code Tips for the Intel RISM MonitorB. Version Differences
This appendix lists an overview of major product enhancements and differences between the current version of the C251 Compiler and previous versions. The current version contains all enhancements listed. Also included are differences between the C251 Compiler and the C51 Version 5.
The version history of newer version is provided in the Release Notes that are part of the product itself.
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