Int 12  - BIOS - Get Memory Size                                           [B]


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

See Also: INT 11,INT 2F/AX=4A06h