Format of DPMS callup/down register structure:
Offset	Size	Description	)
 00h	DWORD	EDI
 04h	DWORD	ESI
 08h	DWORD	EBP
 0Ch  4 BYTEs	reserved (0) (ESP, may be used by DPMS server)
 10h	DWORD	EBX
 14h	DWORD	EDX
 18h	DWORD	ECX
 20h	DWORD	EAX
 24h	DWORD	EIP
 28h	WORD	CS
 2Ah  2 BYTEs	reserved (0)
 2Ch	DWORD	EFLAGS
 30h	DWORD	ESP
 34h	WORD	SS
 36h  2 BYTEs	reserved (0)
 38h	WORD	ES
 3Ah  2 BYTEs	reserved (0)
 3Ch	WORD	DS
 3Eh  2 BYTEs	reserved (0)
 40h	WORD	FS
 42h  2 BYTEs	reserved (0)
 44h	WORD	GS
 46h  2 BYTEs	reserved (0)