int 16h hangs.

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d0z

Joined: 11 Oct 2005
Posts: 11
Location: Sweden

d0z 11 Oct 2005, 09:34

Hello i'm currently learning to program assembly and are working on a starfield. I have made this example code that writes to video memory.

Code:

org 100h
use16
mov ax,0013h
int 10h
mov ax,0A000h
mov fs,ax
mov [fs:10], byte 10
xor ah,ah
int 16h
mov ax,0002h
int 10h
int 20h

I'm using int 16h to wait for user input before exiting. But when I use it the program hangs. What could be the reason for this behavior?

(I'm using windows XP SP2)

/Thanks.

11 Oct 2005, 09:34

Artlav

Joined: 23 Dec 2004
Posts: 188
Location: Moscow, Russia

Artlav 11 Oct 2005, 11:33

Hm. Works fine both in Win XP sp2 and in plain DOS 95.
More details? What exactly "hangs" mean?

11 Oct 2005, 11:33

d0z

Joined: 11 Oct 2005
Posts: 11
Location: Sweden

d0z 11 Oct 2005, 11:45

>>What exactly "hangs" mean?
It means that the program won't listen to the keyboard. I have to CTRL+ALT+DEL and shutdown the program. I have run similar programs on the computer before and they where working fine. But now none of them work anymore and I have no clue why.
It doesn't matter which assembler I use either so I guess it has something to do with Windows XP.

11 Oct 2005, 11:45

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 11 Oct 2005, 15:57

If you remove the "int 16h" the program stops hanging? Maybe something is bad when you switch to mode 2, try mode 3 to see what happend. I tested you program and works fine on my WinXP SP2.

PS: Why you use FS? remember FS is not available on 286 and lower.

11 Oct 2005, 15:57

d0z

Joined: 11 Oct 2005
Posts: 11
Location: Sweden

d0z 11 Oct 2005, 16:54

>>If you remove the "int 16h" the program stops hanging?
Yes.

It doesn't matter if I use mode 3 since it get stuck on int 16h. I'm going to reinstall XP today and that should solve it. It's a little bit annoying though that I don't know what's causing it.

[edit] Now works fine with new XP installation. [/edit]

11 Oct 2005, 16:54

Matrix

Joined: 04 Sep 2004
Posts: 1166
Location: Overflow

Matrix 13 Oct 2005, 05:09

:/ weird

13 Oct 2005, 05:09

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