Problem Session 6 for ECE 109 / CSCI 255

Assignment 4 statistics

• 37 submitted assignments
  • 3 submitted as MS Word file
    • After cut-and-paste from Word, 1 actually assembled
  • 2 submitted as .txt file
    • None assembled
  • 1 submitted as .asm file, but really RTF file
    • Did not assemble, after cut-and-paste
  • 31 submitted as .asm file and really were
    • 28 assembled
• 29 testable assignments with distributed test
  • 8 lost value of R0 somewhere within program
  • 2 had wrong values for characters
  • 2 had wrong values for return
  • 2 forgot at least one RET
  • 1 had a branch to data location
  • 1 had spaghetti code
  • 1 infinite loop, due to not saving R7
  • 2 with several HALT's, positive numbers for test
  • 10 passed the test

Assignment 5

• Assignment description
• Assignment 5 suggestion
  • Load the variable from the "frame" with LDR
  • Test type to determine value to add in
  • Don't use a subroutine for the multiply
  • Store the variable into the "frame" with STR
  • Assemble your program
  • Test your program

Running LC-3 editor and simulator

Because it doesn't seem like a lot of debugging is happening, it might be a good idea to review Problem Session 5.