input and output, Assembly Language

Description:

LC3 allows input from keyboard and output to display on the screen. This lab will exercise the input/output capability using LC-3 Assembly language.

Procedure:

1. First to all design a flow chart for this program. Then implement in LC3 assembly language. Your program will simulate a simple guessing game. The program has stored the value 6.
The program will continually ask the user to guess a number between a and 9 (see sample program input/output below.) The user enters the guess from the keyboard:
• If the guess is larger than 6; the program should output: Too big.
• If the guess is smaller than 6; the program should output: Too small.
• When the user finally guesses correctly, the program will output: Correct! You took # guesses.
• If after 9 guesses, the user has not correctly guessed the number, the program should output: Game over. Correct answer is 6.
2. You do not need to check for invalid input (alphabetical characters, punctuation, etc). If your program encounters any non digit character, the program should output (Invalid input should still count as a guess): Invalid input.
3. When using the LC-3 simulator to test your programs, you should manually load test values into these memory locations before running your program.
4. LC-3 has a set of trap vectors (See slide #10 of Lecture 7 or see Table A.3 in Appendix A of the textbook for details).
• You should use TRAP x20 (GETC), to read in a character from the keyboard.
• Followed by the instruction TRAP x21 (OUT), the character will be displayed on the screen.
• The instruction TRAP x22 (PUTS) will display null-terminated string on the screen.
5. All input and output functions use ASCII characters. You are responsible for making any conversions that are necessary.

• The ASCII code xOA causes the cursor to go to the next line (Newline).
Notes and Suggestions:
• The first line of your programs must specify the memory address of the first instruction of your program. LC-3 simulator will place your program starting at that address. For this assignment, you should place your program starting at x3000.
• Before sitting down at the computer, give some serious thought to what this program involves. Break it into sections. You might even want to draw a simple flow chart .
• Comment your code! Not only does this help you debug your program, but it will make it easier to remember what you did, should you need to look back at your code for future projects (hint, hint).

Posted Date: 2/22/2013 6:43:57 AM | Location : United States







Related Discussions:- input and output, Assignment Help, Ask Question on input and output, Get Answer, Expert's Help, input and output Discussions

Write discussion on input and output
Your posts are moderated
Related Questions
Write an assembly language program to find the maximum of: y = x 6 - 14x 2 + 56x for the range -2 ≤ x ≤ 4, by stepping one by one through the range. The program should in

A good starting point for your program is the toupper.asm program shown in class. It already queries the user for input and sets up a loop that looks at each character of the input

Memory Address Decoding Binary Decoders - Decoders have 2n-inputs and n outputs, each input combination results in a single output line contain a 1, and all other lines contain

Explain the architecture of the file transfer protocol ftp in terms of clients, servers, sockets

write an assembly program to display triangular star like shape

1 st Generation Microprocessor : At the end of the 70s a group of engineers developed a chip is able to processing data. This chip was called processor chip. Big processors w

DMA controller :     Steps include in transferring a block of data from I/O devices (for example a disk) to memory: 1. CPU sends a signal to initiate disk transfe

A/D conversion: Basic tasks: (a) Write a program that will read and display the analog voltage on pin PE7 approximately once every second. (b) Write a program that will read and d

SEG : Segment of a Label:- The SEG operator is which is used to decide the segment address of the, variable, label or procedure and substitutes the segment base address in plac

Memory Interface                                                                  Figure: Memory Modulation design The memory of a computer contain of number of memo