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Index > OS Construction > (OSdev beginner) How to use asm properly?

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Tyler



Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA
Tyler
I want to be able to do things you can't do in other languages, all anyone ever talks about is how in assembly you can program anything a computer can do but I can't seem to find anything beyond dos. Can someone point me in the direction of a website that teaches more than printing strings to the console, please? I don't really know what I want to do with this knowledge, I just like the idea of being in complete control of how a program executes and would like to take my interest father than the limitations of the dos screen. Preferable no to little os dependence(NO DOS). So in short, I guess I'm asking for an idiots guide to making an os. BTW I'm honestly not as stupid as my question, just inexperienced.

EDIT by DOS386 : enhanced subject and moved from Main to OS Construction
Post 19 Nov 2009, 05:08
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ass0



Joined: 31 Dec 2008
Posts: 521
Location: ( . Y . )
ass0
http://flatassembler.net/examples.php

and the link is in this very page =)
Post 19 Nov 2009, 10:59
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DOS386



Joined: 08 Dec 2006
Posts: 1901
DOS386
Tyler wrote:
I want to be able to do things you can't do in other languages, all anyone ever talks about is how in assembly you can program anything a computer can do but I can't seem to find anything beyond dos.


Funny Confused Where did you find all the evil DOS stuff ?

Quote:
Can someone point me in the direction of a website that teaches more than printing strings to the console, please?


This one Idea

Quote:
I don't really know what I want to do with this knowledge, I just like the idea of being in complete control of how a program executes and would like to take my interest father than the limitations of the dos screen.


Seems you have no idea what DOS is. Hint: DOS doesn't provide any "limitations of the dos screen" Idea

Quote:
Preferable no to little os dependence(NO DOS).


So what ??? Windows dependent stuff ??? Or even this would be tolerable ???

Quote:
So in short, I guess I'm asking for an idiots guide to making an os.


http://wiki.osdev.org/Getting_Started#Required_Knowledge

Quote:
BTW I'm honestly not as stupid as my question, just inexperienced.


http://wiki.osdev.org/Getting_Started#Required_Knowledge

ass0 wrote:

Quote:
http://flatassembler.net/examples.php and the link is in this very page =)


Very bad idea, 95% is Windows, is it what Tyler asked for ???

_________________
Bug Nr.: 12345

Title: Hello World program compiles to 100 KB !!!

Status: Closed: NOT a Bug
Post 22 Nov 2009, 09:33
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rCX



Joined: 29 Jul 2007
Posts: 166
Location: Maryland, USA
rCX
Tyler wrote:
So in short, I guess I'm asking for an idiots guide to making an os.

This is a fairly simple tutorial on OS making. It's even written in fasm. You could also study other asm OS's such as DexOS and MikeOS
Post 22 Nov 2009, 16:58
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Tyler



Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA
Tyler
My original question was really cryptic and really never got to the point, so maybe this will help, where can I learn to do the same crap int 21 does without using it? Or at least the principles used. Just a weird question that came to mind, Is it possible to do anything (visible to the user) without using interrupts? ex. displaying text
Post 27 Nov 2009, 07:07
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DOS386



Joined: 08 Dec 2006
Posts: 1901
DOS386
> My original question was really cryptic and really never got to the point

YES Sad

> where can I learn to do the same crap int 21 does without using it?

Code a kernel Wink Maybe also learn to write productive questions Wink

> Is it possible to do anything (visible to the user) without using interrupts?

Sure, how else would BIOS do ? Wink

> ex. displaying text

Write at $000B'8000 Wink
Post 27 Nov 2009, 07:17
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dosin



Joined: 24 Aug 2007
Posts: 337
dosin
to print text - you can use VGA or Vesa...
search VGA asm
you should find a lot.. start with the writing to the screen..
then move to keyboard.. ect...

you can use bios int 0x10
or write to the mem directly,,,
there are a lot of examples on this forum..



http://www.wagemakers.be/english/doc/vga
Post 27 Nov 2009, 07:23
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Dex4u



Joined: 08 Feb 2005
Posts: 1601
Location: web
Dex4u
The simple answer is to do anything you need to write it your self
eg: Write a function that writes to screen
or use the functions that have already been write
eg: read the doc of all the hobby OS's to see how.

But it may help if you say i want a tut to do ?
Then fill in the ? with what you want to do, eg: do you want higher res graphics than is the normal in Dos ?
Post 27 Nov 2009, 19:15
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Tyler



Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA
Tyler
DOS386 wrote:
> ex. displaying text

Write at $000B'8000 Wink

That is exactly the kind of technical stuff I'm interested in. Where could I learn more about "making stuff happen" by writing to specific locations? Is there anywhere that lists things like that (and explanations would be interesting)? Just a note, but college is not an option, I'm 15.

Explanation of "making stuff happen": I mean basically anything that you can do by writing to specific locations.
Post 28 Nov 2009, 07:50
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DOS386



Joined: 08 Dec 2006
Posts: 1901
DOS386
> Where could I learn more about "making stuff happen" by writing to specific locations?

Text: $000B'8000
VGA graphics: $000A'0000
VESA LFB: depends, see http://board.flatassembler.net/topic.php?t=9738

> by writing to specific locations.

Use CPU ports - included in RBIL.
Post 28 Nov 2009, 08:23
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