Activity_AR101

AR101
INSTRUCTIONS:
Determine the contents of all affected general-purpose registers and flags after executing the following
program Code:

Note: Each instruction code is dependent in one another, so, whenever possible refer to the following register
contents listed and assume all flags are set initially to Zero (0).

AX 0015h BP 0002h CS 3000h
BX 0019h SP 0035h DS 2000h
CX 0012h DI 0017h SS 2000h
DX 001Bh SI 001Eh ES 4000h

SF=0 ZF=0 PF=0 CF=0 AF=0 OF=0


Assembly Code:

● ADD instructions

ADD AX, BX
ADD [SI], DX

ADD AX, BX

AX = 0015H = 0000 0000 0001 0101
BX = 0019H = 0000 0000 0001 1001
_______________________________
AX = 0000 0000 0010 1110

AX = 002E

ADD [SI], DX

[SI] = DSX10+SI
DX = 001BH

DSx10+SI
SI = 001EH




000 0010 0000 0000 0000 0000
0000 0000 0001 1110
____________________________
000 0010 0000 0000 0001 1110

SI = 02001EH

, SI = 000 0010 0000 0000 0001 1110
DX = 0000 0000 0001 1011
__________________________________
000 0010 0000 0000 0011 1001

SI = 020039