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Homework Help: TASM/turbo assambly

  1. Dec 11, 2011 #1
    1. The problem statement, all variables and given/known data
    I had to write program which finds all negative elements in columns and calculates their average values and i had to do this with index addressing method. My code below:
    Code (Text):

    .model tiny
               Org 100h
               Jmp Short Start
    Vector     Dw  2, -7, -1, 16, -15
    N          Equ 5


               Xor Bx, Bx
               Xor Dx, Dx
               Xor Si, Si
               Mov Cx, N
               Dec Cx
               Mov Ax, Vector[Bx]  
               Add Bx, 2
               Cmp Ax, 0
               Jge _next
               Inc Si
               Add Dx, Ax
               Dec Cx
               Loop S

               Mov Ax, Dx
               Idiv Si

    .exit 0
    Could someone help me fixing my errors? I would be very thankful.
  2. jcsd
  3. Dec 11, 2011 #2


    User Avatar
    Homework Helper

    Note that loop decrements cx. You don't need the dec cx instruction. Is there a debugger you can use to step through the code one instruction at a time so you can monitor the registers (these also let you view chunks of memory)?
  4. Dec 11, 2011 #3


    Staff: Mentor

    The name of the debugger is tdebug.exe that comes with Turbo. It's pretty easy to use. If you're writing assembly code, it's pretty much essential to use a debugger.
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