INT 12 - BIOS - GET MEMORY SIZE
Return: AX = kilobytes of contiguous memory starting at absolute address 00000h
Note:   this call returns the contents of the word at 0040h:0013h; in PC and
XT, this value is set from the switches on the motherboard
SeeAlso: INT 2F/AX=4A06h

See also: 11

12 - BIOS - GET MEMORY SIZE