a) Convert 89806910h from machine language to its corresponding assembly language. Show all of your workings. (b) Suppose the instruction MOV DI, [BP+42h], appears in a program. What is its machine language for the given instruction?
a) Convert 89806910h from machine language to its corresponding assembly language. Show all of your workings. (b) Suppose the instruction MOV DI, [BP+42h], appears in a program. What is its machine language for the given instruction?
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question
a) Convert 89806910h from machine language to its corresponding assembly language.
Show all of your workings.
(b) Suppose the instruction MOV DI, [BP+42h], appears in a
language for the given instruction?
Transcribed Image Text:8.
R/M
000
001
010
011
100
101
110
111
Use the following charts to answer the questions (a) and (b)
MOD = 11
W=0
AL
CL
DL
BL
AH
CH
DH
BH
W=1
AX
CX
DX
BYTE 1
1000 10
OP CODE
BX
SP
BP
SI
DI
R/M
000
001
010
(BX) + (SI)
(BX) + (DI)
(BP) + (SI)
(BP) + (DI)
(SI)
101 (DI)
110 DIRECT ADDRESS
111 (BX)
EFFECTIVE ADDRESS CALCULATION
MOD=00
011
100
MOD=01
DW MOD REG R/M
(BX) + (SI) + D8
(BX) + (DI) + D8
(BP) + (SI) + D8
(BP)+(DI) + D8
(SI) + D8
(DI) + D8
(BP) + D8
(BX) + D8
Figure: R/M vs MOD Chart for MOV: 100010 instruction
11
OR
REGISTER SELECT (SEE FIGURE 3-7)
BYTE 3
LOW DISPLACEMENT HIGH DISPLACEMENT
DIRECT ADDRESS !
LOW BYTE
MOD=10
(BX) + (SI) + D16
(BX) + (DI) + D16
(BP) + (SI) + D16
(BP) + (DI) + D16
(SI) + D16
(DI) + D16
(BP) + D16
(BX) + D16
Figure: MOV: 100010 instruction template
BYTE 4
DIREST ADDRESS
HIGH BYTE
(5 BITS) ADDRESSING MODE (SEE FIGURE 3.8)
-BYTEWORD DATA 0 BYTE 1 = WORD
- DIRECTION TO/FROM REG 0= FROM 1 - TO
-OPERATION CODE
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