How Do I Correct Errors in My TASM Code for Calculating Averages?

[nuubik]

Homework Statement

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:

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

Start:

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

AVG:
           Mov Ax, Dx
           Cwd
           Idiv Si

.exit 0
end

Could someone help me fixing my errors? I would be very thankful.

 

[rcgldr]

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)?

 

[Mark44]

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.