Single-byte Character Sets
A single-byte character set (SBCS) is a mapping of 256 individual characters to their identifying code values, implemented as a code page. An SBCS can correspond either to a Windows code page or an OEM code page. An SBCS code page can also include a non-native code page, for example, an EBCDIC code page. For definitions of these code pages, see Code Pages.
Your applications use SBCS Windows code pages with the "A" versions of Windows functions. See Conventions for Function Prototypes and Code Pages. To help identify an SBCS code page, an application can use the GetCPInfo or GetCPInfoEx function. In addition, an application can use the MultiByteToWideChar and WideCharToMultiByte functions to map between Unicode and SBCS strings.