MOV AX, 0100h
MOV DS, AX
MOV BX, 1000h

MOV [BX], 5E00h    ; B2D05E00
MOV [BX+2], 0B2D0h ; 3,000,000,000
MOV [BX+4], 0CA00h ; 3B9ACA00
MOV [BX+6], 3B9Ah  ; 1,000,000,000

MOV AX, [BX]       ; 5E00
ADD AX, [BX+4]     ; CA00 + 5E00
MOV [BX+8], AX     ; 2800
MOV AX, [BX+2]     ; B2D0
ADC AX, [BX+6]     ; 3B9A + B2D0 + CARRY
MOV [BX+10], AX    ; EE6B2800

MOV AH, 4Ch
INT 21h