Int 2F/AX=1687h

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DOS Protected-Mode Interface - INSTALLATION CHECK

AX = 1687h

Return:
AX = 0000h if installed BX = flags

bit 0:
32-bit programs supported CL = processor type (02h=80286, 03h=80386, 04h=80486) DH = DPMI major version DL = two-digit DPMI minor version (binary) SI = number of paragraphs of DOS extender private data ES:DI -> DPMI mode-switch entry point (see #02718). AX nonzero if not installed

See Also: AX=1686h - AX=43E0h - AX=DE01h/BX=4450h - AX=FB

See Also: INT 31/AX=0400h - INT 31/AX=5702h - INT D4/AH=10h

(Table 02718) Call DPMI mode switch entry point with:. AX = flags

bit 0:
Set if 32-bit program. ES = real mode segment of buffer for DPMI private data (ignored if SI was zero)

Return:
CF set on error program still in real mode AX = error code (DPMI 1.0+) 8011h unable to allocate all necessary descriptors 8021h 32-bit program specified, but 16-bit DPMI host CF clear if successful CS = 16-bit selector corresponding to real-mode CS SS = selector corresponding to real-mode SS (64K limit) DS = selector corresponding to real-mode DS (64K limit) ES = selector to program's PSP (100h byte limit) FS = GS = 0 high word of ESP = 0 if 32-bit program program now in protected mode

Note: This entry point is only called for the initial switch to protected mode

Category: DOS Extenders - Int 2Fh - D

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