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NASM Forum => Using NASM => Topic started by: nobody on February 06, 2008, 11:40:55 PM

Title: Help with the int 16h
Post by: nobody on February 06, 2008, 11:40:55 PM

I am learning how to use the int 16h, and I have 2 source codes, one works well and the other throws an error.

The first code is:

; Made by InternetNightmare 2004-01-16 Edit: 2004-08-30
; Grafikos Programavimas I dalis: Mode 13h
; English: Graphics Part I: Mode 13h

START:           ; The beginning
   mov ah,0
   mov al,13h
   int 10h
   mov ax,0A000h
   mov es,ax
   mov ax,67
   mov bx,112
   mov cx,320
   mul cx
   add ax,bx
   mov di,ax
   mov dl,7
   mov [es:di],dl
   wl:                ; mark wl
   mov ah,0            ; 0 - keyboard BIOS function to get keyboard scancode
   int 16h            ; keyboard interrupt
   jz wl              ; if 0 (no button pressed) jump to wl
   mov ah,0        ; Restore
   mov al,3        ; textmode
   int 10h         ; for DOS

The other code is:

START:
   MOV AH,0
   INT 16h

The first code works well, but the second throws: "Cannot load VDM IPX/SPX support"

Can someone help me?

Title: Re: Help with the int 16h
Post by: Zolaerla on February 12, 2008, 06:10:51 AM

In my old DOS programs, I tended to just do a:
xor ax, ax
int 016h
to wait for a keypress (you shouldn't need to do a loop with function 0).
No clue if clearing AL matters at all there, but it might be worth a shot.


Also, your listings don't show that you're exiting to DOS, like with
mov ax, 04c00h
int 021h

If that's missing, then who knows what weird things will show up.

Hope that helps!

Title: Re: Help with the int 16h
Post by: nobody on February 15, 2008, 07:10:04 AM

> int 10h ; for DOS

DOS code ?

> Can someone help me?

Problems:

1. Exiting (see post above)
2. Create DOS COM (org 256) or DOS MZ (org 0), but not "both in one"
3. Do you have DOS at all ? ;-)