CALL C000h:0003h - VIDEO BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. INITIALIZATION
InstallCheck:	C000h:0000h must contain the word AA55h and the 
		  512*BYTE[C000h:0002h] bytes must sum to 00h (mod 256)
Note:	is normally called only by the System ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. initialization code