assignment itech 1000

   
ITEC 1000 Assignment #2
Total = 100 marks (Solutions);
· 5 marks file name and general format
Instructions:
· All questions are based on Englander — Chapters 6 & 7.
· Use a word processor (if you use a non-MS WORD compatible program, e.g., Pages, save as PDF or RTF).
· Both questions and answers must be appropriately formatted (including tables) and well presented with enough explanation.
· Be sure to name the file as your full name in the following format (lowercase), e.g., peggy_carter.docx
· Submit via the upload link provided at the course site any time before or by the deadline, March 26, 11 PM (sharp); late submissions will not be accepted.
· Apply the LMC instruction set below to answer relevant questions.
  
LMC Instruction Set Instruction

Mnemonic

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Numeric Code
 
Load

LDA

5xx
 
Store

STO

3xx
 
Add

ADD

1xx
 
Subtract

SUB

2xx
 
Input

IN

901
 
Output

OUT

902
 
End

HLT

000
 
Branch/Jump

BR

6xx
 
Branch if   zero

BRZ

7xx
 
Branch if   zero or positive

BRP

8xx
 
Data storage

DAT

xxx
   
1. Trace the program below and summarize what the program does; not a step-by-step description of each instruction. [5 marks]
  
Address / Mailbox #

Assembly / Mnemonic

Numeric   Code
 
00

IN

901
 
01

STO 90

390
 
02

IN

901
 
03

STO 91

391
 
04

LDA 90

590
 
05

OUT

902
 
06

LDA 91

591
 
07

OUT

902
 
08

HLT

000
 

 
90

DAT 0

000
 
91

DAT 0

000
2. Complete the table below to construct an LMC program that will accept a set of three numbers as INPUT and then add the first two numbers and output the answer, then subtract the first number from the third and output the answer. The program begins at address 00 and data is stored in address 90. [20 marks]
  
Mailbox #

Mnemonic

Numeric code

Instruction Description
 
00

IN

901

Input first number
 
01

 

 

 

 

 

 

 

 

 

   
3. Complete the table below and construct an LMC program that will accept a number INPUT and OUTPUT a sequence of numbers, starting at 1 and finishing with the INPUT (maxNumber). The counter must be initialized to zero each time the program is run. The program will continue (loop) until a 0 is entered. [20 marks]
  
Mailbox #

Mnemonic

Numeric code

Instruction Description
 
00

load zero (from 93) to the accumulator
 
01

Store the initial count
 
02

input
 
03

If zero, branch to halt
 
04

Store maxNumber
 
05

LoopTop load count
 
06

Add step to counter
 
07

Store count
 
08

Output
 
09

Subtract maxNumber
 
10

If positive, endLoop
 
11

Jumpt to loopTop
 
12

endLoop jump to start
 
13

Halt execution
 

 
90

step DAT 1
 
91

maxNumber DAT
 
92

count DAT
 
93

zero DAT
   
4. Complete the table below to construct an LMC program that will accept two INPUT numbers and then OUTPUT the greater of the two. The program should begin at address 00 and data should be stored in addresses beginning at 90. [25 marks]
  
Mailbox #

Mnemonic

Numeric code

Instruction Description
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5. Consider the LMC program below in which 2 numbers are entered and added. Suppose the first input entry was stored in mailbox location 00.
a. Would the program have produced the same result?
b. What would have happened if the program were executed a second time?
c. What characteristic of the computer makes this true? [5 marks]
  
Mailbox
Address

Numeric
Code
 
00

901
 
01

306
 
02

901
 
03

106
 
04

902
 
05

000
 
06

000
  
6. If a computer has a 38-bit memory address register. How much memory can this computer address? (Assume: 1 byte/cell; use the most appropriate measure unit). Show your work. [5 marks]
Consider the following LMC instructions found in the given locations in memory.
  
Mailbox Address

Mnemonic Code
 
15

LDA 40
 
16

ADD 41
 

 
40

723
 
41

021
7. Show the CPU Fetch/Execute cycle steps and the values of Instruction Register (IR), the Program Counter (PC), the Memory Address Register (MAR), the Memory Data Register (MDR), and Accumulator (A) when the instruction in address 15 is completed. [5 marks]
  
F/E cycle

Register Values
 

 

 

 

 

8. Show the contents of each register as each step of the F/E cycle is performed for instruction 16 in the above program. [10 marks]
  
F/E cycle

PC

MAR

MDR

IR

A
 
PC ® MAR

 
MDR ® IR

 
IR [address] ® MAR

 
A + MDR ® A

   
ITEC 1000 Assignment #2
Total = 100 marks (Solutions);
· 5 marks file name and general format
Instructions:
· All questions are based on Englander — Chapters 6 & 7.
· Use a word processor (if you use a non-MS WORD compatible program, e.g., Pages, save as PDF or RTF).
· Both questions and answers must be appropriately formatted (including tables) and well presented with enough explanation.
· Be sure to name the file as your full name in the following format (lowercase), e.g., peggy_carter.docx
· Submit via the upload link provided at the course site any time before or by the deadline, March 26, 11 PM (sharp); late submissions will not be accepted.
· Apply the LMC instruction set below to answer relevant questions.
  
LMC Instruction Set Instruction

Mnemonic

Numeric Code
 
Load

LDA

5xx
 
Store

STO

3xx
 
Add

ADD

1xx
 
Subtract

SUB

2xx
 
Input

IN

901
 
Output

OUT

902
 
End

HLT

000
 
Branch/Jump

BR

6xx
 
Branch if   zero

BRZ

7xx
 
Branch if   zero or positive

BRP

8xx
 
Data storage

DAT

xxx
   
1. Trace the program below and summarize what the program does; not a step-by-step description of each instruction. [5 marks]
  
Address / Mailbox #

Assembly / Mnemonic

Numeric   Code
 
00

IN

901
 
01

STO 90

390
 
02

IN

901
 
03

STO 91

391
 
04

LDA 90

590
 
05

OUT

902
 
06

LDA 91

591
 
07

OUT

902
 
08

HLT

000
 

 
90

DAT 0

000
 
91

DAT 0

000
2. Complete the table below to construct an LMC program that will accept a set of three numbers as INPUT and then add the first two numbers and output the answer, then subtract the first number from the third and output the answer. The program begins at address 00 and data is stored in address 90. [20 marks]
  
Mailbox #

Mnemonic

Numeric code

Instruction Description
 
00

IN

901

Input first number
 
01

 

 

 

 

 

 

 

 

 

   
3. Complete the table below and construct an LMC program that will accept a number INPUT and OUTPUT a sequence of numbers, starting at 1 and finishing with the INPUT (maxNumber). The counter must be initialized to zero each time the program is run. The program will continue (loop) until a 0 is entered. [20 marks]
  
Mailbox #

Mnemonic

Numeric code

Instruction Description
 
00

load zero (from 93) to the accumulator
 
01

Store the initial count
 
02

input
 
03

If zero, branch to halt
 
04

Store maxNumber
 
05

LoopTop load count
 
06

Add step to counter
 
07

Store count
 
08

Output
 
09

Subtract maxNumber
 
10

If positive, endLoop
 
11

Jumpt to loopTop
 
12

endLoop jump to start
 
13

Halt execution
 

 
90

step DAT 1
 
91

maxNumber DAT
 
92

count DAT
 
93

zero DAT
   
4. Complete the table below to construct an LMC program that will accept two INPUT numbers and then OUTPUT the greater of the two. The program should begin at address 00 and data should be stored in addresses beginning at 90. [25 marks]
  
Mailbox #

Mnemonic

Numeric code

Instruction Description
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5. Consider the LMC program below in which 2 numbers are entered and added. Suppose the first input entry was stored in mailbox location 00.
a. Would the program have produced the same result?
b. What would have happened if the program were executed a second time?
c. What characteristic of the computer makes this true? [5 marks]
  
Mailbox
Address

Numeric
Code
 
00

901
 
01

306
 
02

901
 
03

106
 
04

902
 
05

000
 
06

000
  
6. If a computer has a 38-bit memory address register. How much memory can this computer address? (Assume: 1 byte/cell; use the most appropriate measure unit). Show your work. [5 marks]
Consider the following LMC instructions found in the given locations in memory.
  
Mailbox Address

Mnemonic Code
 
15

LDA 40
 
16

ADD 41
 

 
40

723
 
41

021
7. Show the CPU Fetch/Execute cycle steps and the values of Instruction Register (IR), the Program Counter (PC), the Memory Address Register (MAR), the Memory Data Register (MDR), and Accumulator (A) when the instruction in address 15 is completed. [5 marks]
  
F/E cycle

Register Values
 

 

 

 

 

8. Show the contents of each register as each step of the F/E cycle is performed for instruction 16 in the above program. [10 marks]
  
F/E cycle

PC

MAR

MDR

IR

A
 
PC ® MAR

 
MDR ® IR

 
IR [address] ® MAR

 
A + MDR ® A

 

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