Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 66h
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     When the Select Code Page subfunction is used, MS-DOS gets the new
     code page from the COUNTRY.SYS file. The device must be previously
     prepared for code page switching with the appropriate DEVICE=
     directive in the CONFIG.SYS file and NLSFUNC and MODE CP PREPARE
     commands (usually placed in the AUTOEXEC.BAT file).
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