Newbiest, trying to learning

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Bruno Krebs

Joined: 05 Jul 2005
Posts: 1

Bruno Krebs 05 Jul 2005, 05:14

Hi, I'm a brazilian guy trying to learn assembly, I had been looking for some tutorials and articles about assembly, but the few I've founded was not really clear to me... They all begin saying that there are some registers(AX, BX, CX,...) but they don't tell us what are registers. Maybe you guys can explain me, what are theese registers? Are they like variables?
Oh something that I should be greatfull to see, is the program and the source of the most simple and popular program, the "Hello World"...
I'm using the flat assembler 1.62 for Win32. I've already tried to put one source that I've found in the internet but does not works...
Well I'm puting the source here too you guys tell me the what is wrong with it.

Code:

Hellow.asm

.MODEL SMALL ;modelo de memória

.STACK 200h ;aloca espaço na pilha

.DATA ;aqui começam os dados e declaração de 

;variáveis

HelloWorld DB "Hello World$" ;string sempre termina com $

.CODE ;aqui começa o código do programa

START: ;e aqui a função principal

MOV DX, OFFSET HelloWorld ;movendo o OFFSET de HelloWorld

MOV AX, SEG HelloWorld ;movendo o segmento de HelloWorld

MOV DS, AX ;e pondo ele no DS

MOV AH, 9h ;número da função do MS-DOS

INT 21h ;chamada de função

MOV AX, 4c00h ;função de saída do programa

INT 21h

END START ;fim do programa

This is exactly what I've put in the flat and I saved it like "Hellow.asm"
Sorry about my poor english and this long topic Embarassed

And thank you for your atention. Razz

05 Jul 2005, 05:14

madmatt

Joined: 07 Oct 2003
Posts: 1045
Location: Michigan, USA

madmatt 05 Jul 2005, 08:52

Hi Bruno
This program is for another assembler -> MASM, and it is written for DOS, not Windows. Look in the examples folder for 'hello' folder, this is about as simple as a windows program gets (see the other examples too, and study them). Hopefully someone else on this board can give you some information about beginning assembly language, I don't have any information to share with you right now. Sorry.

05 Jul 2005, 08:52

vbVeryBeginner

Joined: 15 Aug 2004
Posts: 884
Location: \\world\asia\malaysia

vbVeryBeginner 05 Jul 2005, 10:48

try the following, it is about the same ur posted masm source

Code:

org 0x100

lea dx,[helloworld]
mov ah,9h
int 21h

mov ax,4c00h
int 21h

helloworld db "Hello World$"

05 Jul 2005, 10:48

YONG

Joined: 16 Mar 2005
Posts: 7997
Location: 22° 15' N | 114° 10' E

YONG 05 Jul 2005, 12:09

We may take advantage of FASM's syntax that a label simply means its offset, and thus the code can be simplified to:

Code:

...
mov dx, helloworld
mov ah, 9
int 21h
...

YONG

05 Jul 2005, 12:09

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 05 Jul 2005, 15:33

did you try http://board.flatassembler.net/viewtopic.php?t=1178?

05 Jul 2005, 15:33

Fungos Bauux

Joined: 19 Jan 2005
Posts: 31
Location: CWB

Fungos Bauux 06 Jul 2005, 13:54

Hi Bruno, im Brazilian too.. we can talk about asm programming, I have some old 8086/z80/8051 and 80386 asm knowledge.. so I stopped there in the ages of asm virii writing.. but now Im trying to get back to asm, but i havent too much time to do anything Sad

If do you want to talk with me.. ICQ UIN: 8380948 MSN: danny.linux@gmx.net JABBER: fungosbauux@jabber.org

06 Jul 2005, 13:54

THEWizardGenius

Joined: 14 Jan 2005
Posts: 382
Location: California, USA

THEWizardGenius 06 Jul 2005, 23:24

BTW, this should be in the DOS or General forums, as the examples do not pertain to Windows.

06 Jul 2005, 23:24

spectrebane

Joined: 14 Nov 2004
Posts: 1

spectrebane 10 Jul 2005, 20:59

You should try this site/book:

http://maven.smith.edu/~thiebaut/ArtOfAssembly/artofasm.html

The Art of Assembly Language Programming by Randall Hyde

It teaches more than assembly programming. I bet you'll download the hole site...

PS: I'm brazilian too! Maybe the internet is not too big as it seem...

10 Jul 2005, 20:59

OzzY

Joined: 19 Sep 2003
Posts: 1029
Location: Everywhere

OzzY 10 Jul 2005, 22:56

Hi there!
I'm brazilian too! Very Happy

I started learning asm to understand how computer viruses work. I was so happy with asm and I loved DOS so much.
But now I'm learning asm with Win32 and find it quiet funny. Now I know how to use those int's from DOS ages, as well as windows api's. Very Happy

It's good to have a lots of brazilians using FASM, cause it's the best assembler I've ever seen. And I'm 18 now, and studying programming since I was 12. But I fell in love with asm and FASM! Very Happy

Good luck with you self-teaching (this is how I learn my 12 languages and learned deeper asm and C.)

For brazilians only: Vamo la porraaa!!! Os coders brasileiros são os melhores!!! LOL

10 Jul 2005, 22:56

El Tangas

Joined: 11 Oct 2003
Posts: 120
Location: Sunset Empire

El Tangas 11 Jul 2005, 20:11

Register are in fact like variables, stored inside the processor, and not in external memory like real variables. You can do more things with registers than with normal variables, but there is only a small number of them.
The code example you posted is meant to be compiled to an .exe file, thats why it has separate sections ( .code, .data). To learn assembly, you should start by .com files, that are simpler. Also, you have to get a debugger to see what happens when your programs run, you will learn a lot that way. To learn MS-DOS assembly, I recomend Borland Turbo Debugger, you can get it from Borland's site for free.

Longo e penoso é o caminho do aprendiz de assembly, mas as recompensas são grandes...

Boa sorte

11 Jul 2005, 20:11

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