University:
University of the People
Course:
CS 4403 | Software Engineering 2
Academic year:

2024
Views:

177

Pages:

2
Author:

iPhothalihs

Assignment Solution In the first problem we needed to implement a ‘for’ loop using the assembler available in the Hack system. The example in Assembler has a lot of comments designed to help you understand the program. First, everything to the right of the // is actually a comment. The only code is actually to the left of the //. Immediately to the right of the //, there is a number. This represents the location in ROM of each line in the program. I have the heading “program counter” above this to indicate that if you watch the current state of the program counter in the CPU simulator you will see the code being executed for any program counter number matches the number in the comments. One important thing to keep in mind is that these examples have been put together using a ‘brute force’ approach. What this means is that the most straight forward approach to solve the problem was used. It is possible (and likely) that there is a more elegant or efficient way to implement any of these problems. This was not done for these examples to make the code easier to read and follows. If you have implemented your solutions to these problems using a more elegant approach your solution is just as valid as these examples! // Problem 1 - for loop // // J=5 // for(i=1; i<5; i++) { // j-// } // //Program //Counter // initialize j variable with value of 5 @5 //00 Load value of 5 into A register D=A //01 Move A to D register @0 //02 Load memory address 0 M=D //03 Move D register to address 0 // initialize i variable with value of 1 @1 //04 Load value of 1 into A register D=A //05 Move A to D register @1 //06 Load memory address 1 M=D //07 Move D register to address 1 // //Test i to make sure it is still less than 5 @1 //08 Load address 1 D=M //09 Move value in address to D register @5 //10 Load value of 5 into A register D=D-A //11 Subtract D register from A register and store in D @25 //12 Load program counter 8 D;JGE //13 Execute a jump if i is 5 // //increment the value of i variable @1 //15 Load memory address 1 D=M+1 //16 Decrement Memory address and store in D @1 //17 Load memory address 1 M=D //18 Store D in address 1 // //decrement the value of j variable @0 //19 Load memory address 0 D=M-1 //20 Decrement memory address and store in D @0 //21 Load memory address 0 M=D //22 Store D in address 0 // //Execute unconditional jump to beginning of the loop @8 //23 Load program counter address 8 D;JMP //24 Execute a jump to 8 // //Unless loop for end of program @25 //25 Load program counter address 25 D;JMP //26

New Documents from this Course

The New Software Engineering

University of the People CS 4403 | Software Engineering 2

Assignment

Computer Systems Assignment Solution

Related Documents

New Documents from this Course

Description

Related Documents

Free up your schedule!

Take 5 seconds to unlock