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Int 2FH Function 1686H
Get CPU Mode
Returns information about the current CPU mode. Programs
which only execute in protected mode do not need to call
this function.
Call With
AX = 1686H
Returns
if executing in protected mode
AX = 0
if executing in real mode or Virtual 86 mode
AX = nonzero
Notes
- Some environments support programs or libraries that can execute
in either real or protected mode (bimodal code). This function is
supplied so that such programs can detect at run time whether they are
running in protected mode and make use of system facilities
accordingly.
- This function should not be used to determine if a DPMI host is
present. A client should make sure that DPMI services are available
before calling this function; otherwise, the results returned by the
function may not be valid.