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214402

Category: memory management
Flags: Undocumented function

INT 21 - Qualitas 386MAX v6.00+ - IOCTL INPUT - GET STATE

	AX = 4402h
	BX = file handle for device "386MAX$$"
	CX = number of bytes to read
	DS:DX -> BYTE 03h followed by 386MAX state buffer (see #01467)
Return: CF clear if successful
	    buffer at DS:DX+1 filled
	    AX = number of bytes actually copied
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)
Notes:	if the value given in CX is less than the size of the state record
	  (5Ah for v6.01, 66h for v7.00), only a partial state record will be
	  returned
	the state is 40h bytes for 386MAX (actually ASTEMM) v2.20 ("386MAX$$"
	  did not exist yet, use "QMMXXXX0" and then "EMMXXXX0" instead) and
	  56h bytes for v5.11.
	to invoke 386MAX API functions, push DX onto the stack, load DX with
	  the word at offset 25h in the returned state, load all other
	  registers as needed for the desired function, and execute an
	  OUT DX,AL or OUT DX,AX; DX will be set to the pushed value on return
	  if it is not otherwise modified by the API function.	For safety,
	  in case a function is not supported or 386MAX is not present, SP
	  should be saved and restored around the API call.
	Windows 3.1 Standard mode, LAN Manager, and Windows for Workgroups all
	  use the 386MAX API; LAN Manager and Windows for Workgroups reportedly
	  make some calls incorrectly
SeeAlso: AX=4403h/SF=03h"386MAX",INT 67/AH=3Fh


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