Int 67/AX=FFA5h

Microsoft EMM386.EXE v4.20+ - INSTALLATION CHECK

AX = FFA5h

Return:
AX = 845Ah/84A5h if loaded
BX:CX -> API entry point (see #03666)

Notes: This call is available even if EMM386 is not providing EMS. The returned AX is 845Ah inside of MSWindows, 84A5h under bare DOS. If no other program has hooked INT 67, an alternate installation check is to test for the string "MICROSOFT EXPANDED MEMORY MANAGER 386" at offset 14h in the INT 67 handler's segment; the word immediately preceding this string contains the offset of the API entry point



(Table 03666)
Call EMM386.EXE API entry point with:.
AH = 00h get memory manager's status
Return:
AH = status
bit 0:
Not active (OFF)
bit 1:
In "Auto" mode.
AH = 01h set memory manager's state
AL = new state (00h ON, 01h OFF, 02h AUTO).
AH = 02h Weitek coprocessor support
AL = subfunction
00h get Weitek support state
Return:
AL = status
bit 0:
Weitek coprocessor is present
bit 1:
Weitek support is enabled
01h turn on Weitek support
02h turn off Weitek support
--- v4.20-4.41 only ---.
AH = 03h Windows support???
AL = subfunction (00h, 01h).
AH = 04h print copyright notice to standard output
(using INT 21/AH=09h).
AH = 05h print available report
(the one shown when running EMM386 from the DOS prompt)

See Also: #01513 at INT 21/AX=4402h/SF=02h - #02617 at INT 2F/AX=12FFh/BX=0106h

Category: Memory Management - Int 67h - M

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