Nasm problem

[sbeng77]

Ok,
now i've added 0 and $ character.

org 100h

mov al,num1
add al,num2
add al,30h
add al,'$'

mov dx,ax
mov ah,09h
int 21h
mov ah,4Ch ; ah = 4Ch
int 21h

num1 db 5
num2 db 3

When i execute this code it show also some bad character and no sum result.

[AJ]

Please do the following:

1) Read my previous post paying attention to the bit which hints about learning the usage of [] for loading memory values.
2) Learn what a string is. When you take a character and add the value of '$', that does not make the character a '$' terminated string.
3) See the part about ensuring DS:DX points to the correct location. This does not mean that DX should contain the value you are wanting to print - it is a pointer
4) Before attempting this, you need to start by reading some assembly tutorials and familiarising yourself with some basic programming concepts (pointers, strings variables etc...).

Cheers,
Adam

[sbeng77]

Ok i'll study them.
In my honest opinion exist too assembly version (nasm, tasm, masm for win/linux) and different syntax.
Thank you and excuse me!

[sbeng77]

I've result it!

org 100h

main:

mov al,num1
add al,num2
add al,'0'
mov ah,0EH
int 10h
num1 equ 3
num2 equ 6

I used int 10h (with value in al) and is ok.

[sbeng77]

I solved my sum question:

org 100h

main:

mov al,num1
add al,num2
add al,'0'
mov ah,0EH
int 10h
num1 equ 3
num2 equ 6

I used int 10h (with value in al) and is ok.

[i586coder]

Is the problem of how to print integer from register to screen
if so,...,take look @ this code, may be useful for you,it's print the contents of AX register to screen

Code: Select all

print_ax proc
cmp ax, 0
jne print_ax_r
    push ax
    mov al, '0'
    mov ah, 0eh
    int 10h
    pop ax
    ret 
print_ax_r:
    pusha
    mov dx, 0
    cmp ax, 0
    je pn_done
    mov bx, 10
    div bx    
    call print_ax_r
    mov ax, dx
    add al, 30h
    mov ah, 0eh
    int 10h    
    jmp pn_done
pn_done:
    popa  
    ret  
endp

good luck

[Combuster]

In his case I'd add as homework to explain how that code works in detail. Just posting code won't really help in his case...

[sbeng77]

Exactly.