- To do this homework assignment, you need to obtain a copy of the
prepared file hw1.s
into your cs255 project directory
using EGTAPI:
- Use project code hw1 to obtain the prepared files
- Watch this video on how to get the prepared files for this homework (and other homework/project): click here
- The prepared file
hw1.s will
be copied into your
cs255/hw1
directory.
- Use your PC and
login to
the MathCS gateway
lab0z.mathcs.emory.edu
- This step has been covered in class.
If you missed the class, read these write ups:
- Windows users: click here
- Mac users: click here
- This step has been covered in class.
- Once you logged in, execute this command on
lab0z to find
an idle
lab machine:
cat /tmp/labmachines
Pick an idle machine from the list.
Let's say you picked lab4d - I will use it in the remainder of the example (replace lab4d with the machine name that you picked)
- Remote login to
the lab machine of your
choice using the Secure Sheel command
ssh:
ssh lab4d
Type in your net password when prompted
- On lab4d, use the cd command to change the current directory
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(I use ~ in the command to make certain you will go to the project directory from any sub-directory) When you list the currect directory with the ls command, you should see the prepared file hw1.s in the current directory:
(You should see: hw1.s) |
- Make sure you are in the
directory that contains
the prepared file by
executing this command:
pwd
It output must be: /home/yourNetID/cs255/hw1
If not, execute this command:
cd ~/cs255/hw1
and re-check with the pwd command
- While inside the
cs255/hw1 directory,
you can use this command to
edit the
hw1.s file:
nano hw1.s
Brief instructions on how to use the nano editor:
- Use the arrow keys to
navigate to the place you want to
insert text.
- When you reach the place of insertion,
type in the text that you want to insert.
- Undo
the last action: type Alt-U
(hold alt-key and
press U)
- Redo
the last undone action: type
Alt-E
- Press control-S
(hold control-key and
press S)
to save
the changes
-
Press control-X to
quit the
nano editor
- If you have not made any changes or have saved the file changes before
you quit nano,
then nano will
exit right away
- However, if you have some unsaved changes, nano will prompt you whether you want to save them or not.
- If you have not made any changes or have saved the file changes before
you quit nano,
then nano will
exit right away
- Use the arrow keys to
navigate to the place you want to
insert text.
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- Name one (1) non-programmable machine that was invented to help humans perform computations.
- Name one (1) non-electrical machine that is programmable, i.e.: the machine can change its programming (= can perform different variants of a task)
- Give the 4 categories of components in a computer.
- Give the 2 components in a computer system.
- Give an example of a peripheral device that can
perform both input and output operations.
- What is the functiuon of the CPU (Central Processing Unit) ?
- What is the function of the computer memory (RAM) ?
- Where are all the instructions of a computer program stored ?
- Where are all the variables of a computer program stored ?
- Which component in the computer system execute the instructions of a computer program ?
- How is a memory cell in the computer memory (RAM) identified, i.e.: what do you use to distiniguish different memory cells.
- Which bus in the system bus carries (= transmits) the memory identifying information from the CPU to the memory ?
- Which bus in the system bus is used to transfer data between the CPU and the memory ?
- Which bus in the system bus contains the Read/Write signal ?
- Which bus is used by the computer to send the value stored in a program variable (such as int x) between the CPU and the memory ?
- What is a bit ?
- How many bits are in a byte in modern computers ?
- Show all the binary number patterns that 1 bit can store.
- Show all the binary number patterns that 2 bits can store.
- How many different binary number patterns can 1 byte store ?
- Consider the following content of the computer memory:
- Can the bytes at memory location 4000 and 4001 be combined to make a larger memory unit ?
- If you answer yes to the above question, then: how many different binary number patterns can the cobined memory unit store ?
- Can the bytes at memory location 4000 and 4002 be combined to make a larger memory unit ?
- Can the bytes at memory location 4000, 4001 and 4002 be combined to make a larger memory unit ?
- Can the bytes at memory location 4001 and 4002 be combined to make a larger memory unit ?
- What type (kind) of numbers are stored inside a computer memory ?
- Name the 2 operations that the CPU can perform on the computer memory.
- If the data bus has 16 wires, how many bytes can the data bus transfer in one read/write operation ?
- If the address bus has 16 wires, what is the maximum memory size of this computer (i.e., how many bytes maximum can the memory contain) ?
- If the address bus has 34 wires, what is the maximum memory size of this computer (i.e., how many bytes maximum can the memory contain) ?
- For this question, you need to search online for
Morse code
Or you can use this Wikipedia page
The Morse code is a signalling code designed to transmit English text by radio pulses (beeps). The characters encoded by the Morse code is case-insenstive.
We denote a short pulse as • (dot) and a long pulse as - (dash)
Decode this message in Morse code:
•••• • •-•• •-•• --- Message: - For this question, you need to search online for binary ASCII code
The ASCII code is a binary code to represent the English characters and symbols. Characters encoded by ASCII is case-sensitive !
Decode this message in ASCII code:
01000110 01101001 01110011 01101000 Message: - Suppose you are given the following binary number:
01000001 Corresponding decimal number:What is the decimal number that corresponds to this binary number ?
- Suppose you are given the following binary number:
01000001 Character represented by ASCII code:What is the character that is represented by this binary number ?
- Make a correct English sentence that
starts with:
I is
- Give the representation of the decimal number 4359 in the octal number system
(that is based on the number 8).
- Give the representation of the decimal number 4359 in the hexadecimal number
system
(that is based on the number 16).
- Give the representation of the binary number
10100110
in the octal number system
- Give the representation of the octal number 354
in the binary number system
- Give the representation of the hexameciaml number AF in the binary number system
- Compute in binary: (5 pts each)
(1) 10100100 + 00101111 (2) 10100100 - 00101111
Use spaces to indent and line up digits with the nano editor.
Comment: do not use Internet tools to do this question, because you may get this kind of question on the test. Use this question to practice for the test.
- Suppose a computer has a
address bus that consists of
20 wires.
What is the maximum
amount of memory
that this computer can have ? (5 pts)
- What is the minimum width (= number of wires) of the address bus in order to address a 640K bytes memory ? (5 pts)
- You can make and receive extension requests for a homework/project
as long as you have not exceeded the maximum requests allowed.
Extension requests must be made before the assignment is due !!!
"Free" extension requests are granted for illness and family emergencies.
To make an extension request, do the following in EGTAPI:
1. Click on File Browser in EGTAPI 2. Click on Req ext (lower right corner) in the File Browser menu The "Egtapi Extension Request" window will pop up:
3. In the "Section Number" drop down tab:
Select "1" if you are in Section 1
Select "2" if you are in Section 2
4. Enter "Project Code": hw1
5. Click the "Request extension" button
6. You will see the request result in the right most panel.
If your request is successfull, you will see:
Extension request was successful:
Turn hw1 in before ..... (new due date)
in the "Request extension" pop up window (you may need to scroll down)
You request will be successful if you have not exceeded the maximum number of "free" (no-questions-asked) requests allowed
-
Important note:
- You must
turn in your program to complete the assignment !!!
- You must turn in each assignment before its due date (unless you have requested an extension).
- The easiest way to turn in
your work is
using EGTAPI
Watch this video on how to turn in a file with EGTAPI: click here
- Here are the written instructions explained in the video:
1. Click on File Browser in EGTAPI 2. Select the file that you want to turn in
In this case, select the file "hw1.s" inside your hw1 folder
3. After selecting the file (in this case: "hw1.s"), click Turnin in the File Browser menu
The "Egtapi Turn-in" window will pop up:
4. In the "Section Number" drop down tab:
Select "1" if you are in Section 1
Select "2" if you are in Section 2
5. Enter "Project Code": hw1
6. Click the "Turn in" button
7. You will see the turn in result in the right most panel.
Make sure that your see the message: "Program ... has been successfully turned in..."
If you want to see what you have turned in, then
1. Open the EGTAPI Terminal (click on "Terminal") 2. Enter this command in the lower input area of the Terminal panel: /home/cs255001/turnin // If you're in section 1 or /home/cs255002/turnin // If you're in section 2
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