说明：  no intro
(SCM subroutine, there are a variety of data formats of various mathematical operations. (1) according to the popular IBM PC as the host to the development of system requirements on the assembly language, the atomic program library and bit address labels were adjusted, the reader do not have to be modified, can be used directly. (2) floating-point subroutine library for further testing and optimization of the decimal floating-point and binary floating point conversion routines between been completely rewritten and improved the calculation accuracy and reliability. (3) The new addition of a number of floating point routines (Carrier, compare, clear, sub-zero, etc.), so that the work of preparing the data processing more intuitive.)