STACK:	WORD	0042h (function "Read Extended System Configuration
			  Data")
		DWORD	-> buffer for storing ESCD
		WORD	read/writable selector for ESCD if memory-mapped and
			  called in protected mode (ignored otherwise)
		WORD	PnP BIOS writable segment/selector
Return: AX = status (see #F0081)
Notes:	the large-model C declaration is
	  int (*entry)(int, unsigned char *, unsigned int, unsigned int);
	if an ESCD selector is required, the caller must construct a 16-bit
	  data segment selector with a limit of 64K

(Table F0045)
Call Plug-and-Play BIOS function 43h with:
	STACK:	WORD	0043h (function "Write Extended System Configuration
			  Data")
		DWORD	-> buffer containing ESCD
		WORD	read/writable selector for ESCD if memory-mapped and
			  called in protected mode (ignored otherwise)
		WORD	PnP BIOS writable segment/selector
Return: AX = status (see #F0081)
Notes:	the large-model C declaration is
	  int (*entry)(int, unsigned char *, unsigned int, unsigned int);
	if an ESCD selector is required, the caller must construct a 16-bit
	  data segment selector with a limit of 64K

(Table F0046)
Call Desktop Management Specification function 50h with:
	STACK:	WORD	0050h (function "Get DMI Information")
		DWORD	-> buffer for ASCIZ DMI BIOS revision string
		DWORD	-> WORD to receive number of DMI structures
		DWORD	-> WORD to receive size of largest DMI structure
		DWORD	-> DWORD to receive DMI storage base address
		DWORD	-> WORD to receive DMI storage size
		WORD	BIOS selector
Return: AX = status (see #F0081)
Notes:	the large-model C declaration is
	  short (*entry)(int, unsigned char *, unsigned short *,
			unsigned short *, unsigned long *, unsigned short *,
			unsigned short) ;
	the BIOS may return a structure size larger than the actual largest
	  DMI structure to permit dynamic information
	this function is available in both real mode and 16-bit protected mode
SeeAlso: #F0047

(Table F0047)
Call Desktop Management Specification function 51h with:
	STACK:	WORD	0051h (function "Get DMI Structure")
		DWORD	-> WORD number/handle of structure to retrieve
		DWORD	-> buffer for DMI structure
		WORD	DMI read/write data selector
		WORD	PnP BIOS read/write selector
Return: AX = status (see #F0081) 
Notes:	the large-model c declaration is
	  short (*entry)(int, unsigned short *,unsigned char *, unsigned short,
			unsigned short) ;
	structure number 0000h will return the first SMBIOS structure; the
	  variable is updated with the number of the next structure after each
	  successful call, returning FFFFh if the last structure has been
	  returned
	this function is available in both real mode and 16-bit protected mode
SeeAlso: #F0046,#F0048

(Table F0048)
Call System Management BIOS function 52h with:
	STACK:	WORD	0052h (function "Set DMI Structure")
		DWORD	-> buffer containing new data (see #F0049)
		DWORD	-> BIOS work buffer
		BYTE	control flags
			bit 0: set structure instead of just validating
			bits 7-1: reserved (0)
		BYTE	padding
		WORD	DMI read/write data selector
		WORD	PnP BIOS read/write selector
Return:	AX = status (see #F0081)
SeeAlso: #F0025,#F0047,#F0051

Format of DMI data buffer for SMBIOS function 52h:
Offset	Size	Description	(Table F0049)
 00h	BYTE	operation to perform (see #F0050)
 01h	BYTE	offset within fixed data of the structure for the to-be-
		  changed item
 02h	DWORD	change mask for BYTE/WORD/DWORD change operation
		this value is ANDed with the existing data prior to
		  applying the change value given below
 06h	DWORD	change value for BYTE/WORD/DWORD change operation
		this value is ORed with the result of applying the
		  change mask above to the existing data
 0Ah	WORD	data length for structure-add, string-change, block-change
		for a string-change command, this field specifies the
		  length of the string including the NUL terminator; if
		  the length is 1 (empty string), the string is removed
		  if the applicable access rights are met
 0Ch  4 BYTEs	structure header of structure to be changed/added/removed
		(see also #F0059)
 10h	var	new structure data for structure-add or block-change cmd
		new string data for string-change command
SeeAlso: #F0048,#F0059

(Table F0050)
Values for SMBIOS structure-change operation:
 00h	change a single byte in the identified structure
 01h	change a word (two bytes) in the identified structure
 02h	change a DWORD (four byets) in the identified structure
 03h	add the identified structure to the SMBIOS structure pool
 04h	remove the identified structure from the SMBIOS structure pool
 05h	change a string in the identified structure
 06h	change a block of data in the identified structure
 07h-FFh reserved for future revisions of specification
SeeAlso: #F0049

(Table F0051)
Call System Management BIOS function 53h with:
	STACK:	WORD	0053h (function "Get Structure Change Information")
		DWORD	-> SMBIOS change structure (see #F0052)
		WORD	DMI read/write data selector
		WORD	PnP BIOS read/write selector
Return: AX = status (see #F0081)
SeeAlso: #F0025,#F0048,#F0053

Format of SMBIOS change structure:
Offset	Size	Description	(Table F0052)
 00h	BYTE	change status
		00h no change
		01h other
		02h unknown
		03h single SMBIOS structure affected
		04h multiple SMBIOS structures affected
		other reserved
 01h	BYTE	change type
		bits 7-2 reserved (0)
		bit 1: structure(s) added
		bit 0: structure(s) changed
 02h	WORD	structure handle (if change status == 03h)
 04h 12 BYTEs	reserved (0)
Note:	if multiple structures changed, all of the SMBIOS structures must be
	  enumerated to determine what changed
SeeAlso: #F0051

(Table F0053)
Call System Management BIOS function 54h with:
	STACK:	WORD	0054h (function "SMBIOS Control")
		WORD	subfunction (see #F0054)
		DWORD	-> data
		BYTE	control flags
			bits 7-1: reserved (0)
			bit 0: perform the operation instead of just validating
				  parameters
		BYTE	padding
		WORD	DMI read/write data selector
		WORD	PnP BIOS read/write selector
Return: AX = status (see #F0081)
SeeAlso: #F0025,#F0051,#F0056

(Table F0054)
Values for SMBIOS function 54h subfunction:
 0000h	clear event log
	data parameter must be 00000000h
 0001h	control event logging
	data parameter points at 2-WORD buffer containing AND-mask and
	  OR-mask for modifying logging values; on return, the second word will
	  contain the prior value of the control flags (see #F0055)
 0002h	(v2.1+) clear event log (Type 15)
	data parameter is 32-bit physical address of a scratch buffer for use
	  by the BIOS, which must be writeable and at least as large as the
	  largest-structure size reported by function 50h
 0003h-3FFFh reserved for future revisions of specification
 4000h-7FFFh reserved for BIOS vendor
 8000h-FFFFh reserved for system vendor
SeeAlso: #F0053

Bitfields for SMBIOS event logging control word:
Bit(s)	Description	(Table F0055)
 15-3	reserved for future use (0)
 2	disable logging of POST errors
 1	enable logging of correctable memory errors
 0	enable overall event logging
SeeAlso: #F0054

(Table F0056)
Call System Management BIOS function 55h with:
	STACK:	WORD	0055h (function "Get General-Purpose NonVolatile Info")
		DWORD	-> WORD GPNV handle (set to 0000h for first call)
		DWORD	-> WORD (ret) minimum buffer size (in bytes)
		DWORD	-> WORD (ret) size allocated for this GPNV
		DWORD	-> DWORD (ret) physical base address for memory-mapped
				  non-volatile storage (00000000h if PMode
				  mapping not required)
		WORD	PnP BIOS read/write selector
Return: AX = status (see #F0081)
	GPNV handle var set to handle of next GPNV area or FFFFh if no more
SeeAlso: #F0025,#F0053,#F0057

(Table F0057)
Call System Management BIOS function 56h with:
	STACK:	WORD	0056h (func "Read General-Purpose NonVolatile Data")
		WORD	GPNV handle for area to be read
		DWORD	-> buffer for GPNV data (must be large enough to hold
			  entire area - use "min buffer size" from func 55h)
		DWORD	-> WORD lock value or FFFFh to ignore
		WORD	GPNV storage selector
		WORD	PnP BIOS read/write selector
Return: AX = status (see #F0081)
	lock value set to value of the current lock if it was not FFFFh on
	  entry and locking is supported
SeeAlso: #F0025,#F0056,#F0058

(Table F0058)
Call System Management BIOS function 57h with:
	STACK:	WORD	0057h (func "Write General-Purpose NonVolatile Data")
		WORD	GPNV handle for area to be written
		DWORD	-> buffer containing GPNV data
		WORD	lock value (must match value set by prior read) or
			  FFFFh for a forced write
		WORD	GPNV storage selector
		WORD	PnP BIOS read/write selector
Return: AX = status (see #F0081)
SeeAlso: #F0025,#F0057

Format of SMBIOS data structure:
Offset	Size	Description	(Table F0059)
 00h  4 BYTEs	structure header
		BYTE structure type (see #F0060)
			80h-FFh available for system/OEM-specific data
		BYTE length of formatted data, including header
		WORD structure handle (a unique value 0000h-FEFFh [v2.0 allows
			  up to FFFEh])
			handles FF00h-FFFFh are reserved for use by the SMBIOS
			  specification
			handles need not be contiguous -- a handle might not
			  exist any more after a configuration change, but the
			  BIOS may not re-assign that handle number to another
			  structure
---type 00h---
 04h	BYTE	string number of the vendor name (string numbers are 1-based)
 05h	BYTE	string number of the version string (00h if not present)
 06h	WORD	starting segment of runtime BIOS
 08h	BYTE	string number of BIOS release date
 09h	BYTE	size of BIOS ROM (stored as one less than number of 64K units)
 0Ah	QWORD	BIOS characteristics (see #F0061)
 12h	var	optional space for BIOS characteristics extension
		  (see #F0062,#F0063)
		(size of optional space is implied by header's length field)
 var	var	free-form ASCIZ strings (max 64 bytes per string)
---type 01h---
 04h	BYTE	string number of manufacturer name
 05h	BYTE	string number of product name
 06h	BYTE	string number of version number
 07h	BYTE	string number of serial number
 08h 16 BYTEs	(v2.1+) universal unique ID number (UUID)
		all-FFh if not currently set
		all-00h if not present
 18h	BYTE	(v2.1+) type of last wake-up event (see #F0064)
---type 02h---
 04h	BYTE	string number of manufacturer name
 05h	BYTE	string number of product name
 06h	BYTE	string number of version number
 07h	BYTE	string number of serial number
---type 03h---
 04h	BYTE	string number of manufacturer name
 05h	BYTE	chassis type
		bit 7: chassis lock present
		bits 6-0: (see #F0065)
 06h	BYTE	string number of version number
 07h	BYTE	string number of serial number
 08h	BYTE	string number of asset tag number
 09h	BYTE	(v2.1+) enclosure state at last boot (see #F0066)
 0Ah	BYTE	(v2.1+) power supply state at last boot
 0Bh	BYTE	(v2.1+) thermal state at last boot
 0Ch	BYTE	(v2.1+) physical security status at last boot (see #F0067)
 0Dh	DWORD	(v2.3+) OEM/BIOS-specific information
---type 04h---
 04h	BYTE	string number of socket designation
 05h	BYTE	processor type (see #F0068)
 06h	BYTE	processor family (see #F0069)
 07h	BYTE	string number of processor manufacturer
 08h	QWORD	processor identification data (see #F0070)
 10h	BYTE	string number of processor version string
 11h	BYTE	voltage (see #F0071)
 12h	WORD	external clock frequency in MHz (0000h if unknown)
 14h	WORD	maximum internal processor speed in MHz (0000h if unknown)
 16h	WORD	current internal processor speed in MHz (0000h if unknown)
 18h	BYTE	processor status (see #F0072)
 19h	BYTE	processor upgrade (see #F0073)
 1Ah	WORD	(v2.1+) handle of L1 cache information structure, or FFFFh
 1Ch	WORD	(v2.1+) handle of L2 cache information structure, or FFFFh
 1Eh	WORD	(v2.1+) handle of L3 cache information structure, or FFFFh
---type 05h---
 04h	BYTE	error-detection method
 05h	BYTE	error-correction capability
 06h	BYTE	supported memory interleave
 07h	BYTE	current memory interleave
 08h	BYTE	maximum memory module size (00h=1M, 01h=2M, 02h=4M, etc.)
 09h	WORD	supported memory speeds
 0Bh	WORD	supported memory types
 0Dh	BYTE	voltages supported by memory modules
		bits 7-3: reserved (0)
		bit 2: 2.9V
		bit 1: 3.3V
		bit 0: 5.0V
 0Eh	BYTE	number of memory slots
 0Fh  N WORDs	handles of memory information structures for each slot
	BYTE	(v2.1+) enabled error-correction capabilities
!!!ftp://download.intel.com/ial/wfm/smbios.pdf p.39
---type 06h---
 04h	BYTE	string number for socket designation
 05h	BYTE	bank connections
 06h	BYTE	current memory speed in ns (00h = unknown)
 07h	WORD	current memory type
 09h	BYTE	installed size
 0Ah	BYTE	enabled size
 0Bh	BYTE	error status
		bits 7-3: reserved (0)
		bit 2: get error status info from event log (bits 1-0 reserved)
		bit 1: correctable errors encountered
		bit 0: uncorrectable errors encountered, some or all of module
			  disabled
---type 07h---
 04h	BYTE	string number of socket designation
 05h	WORD	cache configuration
 07h	WORD	maximum cache size
 09h	WORD	installed cache size
 0Bh	WORD	supported SRAM type(s)
 0Dh	WORD	current SRAM type
 0Fh	BYTE	(v2.1+) cache speed in ns (00h = unknown)
 10h	BYTE	(v2.1+) error correction type
 11h	BYTE	(v2.1+) system cache type
 12h	BYTE	(v2.1+) cache associativity
---type 08h---
------
 var	WORD	0000h end-of-structure marker
		(if strings are present, only a single byte of 00h is needed,
		  because the terminating NUL of the last string forms the
		  first	byte of the end-of-structure marker)
Note:	structures can have new fields added in successive revisions of the
	  SMBIOS specification, so applications should use the actual length
	  field given in the SMBIOS structure; as of SMBIOS v2.3, structure
	  types also have a minimum length to enable the addition of optional
	  fields
SeeAlso: #F0049

(Table F0060)
Values for SMBIOS structure type:
 00h	BIOS Information
 01h	System Information
 02h	Motherboard Information
 03h	system enclosure/chassis information