How do the register contents change as instruction is performed?
Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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MARIE Assembly LANGUAGE/MARIE Simulator
Instructions: Fill-in the boxes with the correct answer.
![MARIE Simulator: Fill-in the boxes
How do the register contents change as instruction is performed?
1. Reload the original Examples → Addition code.
2. Step through the program to complete the table below, which traces the register
contents and some memory locations after each instruction is executed.
o Use EEE as the first input
o Use 113 as the second input
The program trace should make sense considering what each instruction is supposed to do
and the function of each register.
Instruction
AC
IR
MAR
MBR
PC
IN
OUT M[X]
M[Y]
(initial values) 0000
0000
000
0000
000
0000 0000 0000
0000
Input
OEEE
5000
000
5000
001
OEEE 0000 0000
0000
Store X
OEEE
2007
OEEE
002
OEEE 0000
|0000
Input
0113
002
5000
003
0113 0000 OEEE
0000
Store Y
2008
008
0113
004
0113 0000 OEEE
0113
Add X
3007
007
005
0113 0000 0OEEE
0113
Output
1001
6000
005
6000
0113 1001 OEEE
0113
Halt
1001
7000
7000
007
0113 1001 OEEE
0113](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F222a4de8-8696-4ef9-bb45-30957f77858c%2Fbb1c764f-bd32-4a85-93e3-8a1df487fc2d%2Fd6ailqa_processed.png&w=3840&q=75)
Transcribed Image Text:MARIE Simulator: Fill-in the boxes
How do the register contents change as instruction is performed?
1. Reload the original Examples → Addition code.
2. Step through the program to complete the table below, which traces the register
contents and some memory locations after each instruction is executed.
o Use EEE as the first input
o Use 113 as the second input
The program trace should make sense considering what each instruction is supposed to do
and the function of each register.
Instruction
AC
IR
MAR
MBR
PC
IN
OUT M[X]
M[Y]
(initial values) 0000
0000
000
0000
000
0000 0000 0000
0000
Input
OEEE
5000
000
5000
001
OEEE 0000 0000
0000
Store X
OEEE
2007
OEEE
002
OEEE 0000
|0000
Input
0113
002
5000
003
0113 0000 OEEE
0000
Store Y
2008
008
0113
004
0113 0000 OEEE
0113
Add X
3007
007
005
0113 0000 0OEEE
0113
Output
1001
6000
005
6000
0113 1001 OEEE
0113
Halt
1001
7000
7000
007
0113 1001 OEEE
0113
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