Compatibility: 3.3+
Expects: AX    6601H
Returns: AX    error code if CF is set to CY
BX    current active code page (as set by the user)
DX    system code page (a setup at boot time)
Info: Obtains the code page ID for the current active code page and the
default system code page, as set during system startup.

Notes:   The system code page is set via the COUNTRY= command in

See Also: fn 6602H (activate code page)
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DOS Fn 6601H: Query Active Code Page