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==Support in operating systems==
When operating systems initialize their codepage switching logic, they need to know but have no means to determine the previously active hardware code page.<ref name="Paul_2001_CPSwitchFD"/><ref name="Caldera_1998_USER"/><ref name="Paul_1997_NWDOSTIP"/><ref name="Paul_2001_NWDOSTIP"/> Under [[DOS]] this was accomplished by specifying the hardware codepage as a parameter to the [[device driver]]s [[DISPLAY.SYS]] and [[PRINTER.SYS]] (hwcp) in [[CONFIG.SYS]]:
: <tt>[[DEVICE (CONFIG.SYS directive)|DEVICE]]=...\DISPLAY.SYS CON=(type,hwcp,n|(n,m))</tt><ref name="Paul_2001_CPSwitchFD"/><ref name="Caldera_1998_USER"/><ref name="Paul_1997_NWDOSTIP"/><ref name="Paul_2001_NWDOSTIP"/>
If no hardware code page was specified, these drivers defaulted either to a dummy code page number 999<ref name="Paul_2001_CPSwitchFD"/><ref name="Paul_1997_NWDOSTIP"/><ref name="Paul_2001_NWDOSTIP"/> or assumed the hardware code page to be equal to the [[primary code page]] (the first codepage listed in [[COUNTRY.SYS]] files for a particular country as specified by the
==OEM code pages==
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