linebreak in protected mode?

Index > OS Construction > linebreak in protected mode?

Author

Thread

qyte

Joined: 13 Aug 2006
Posts: 6

qyte 24 Dec 2006, 23:21

Hi,

i got a little problem with my bootloader. After I set up the protected mode i can't use the BIOS to print messages (where the linebreak is no problem).
In protected mode the bytes 12 and 10 are shown as a circle and a not, or something. Here's the code for printing my text.

Code:

pr_str:
        mov   esi,loadKernelMsg
        mov   edi,0xB8000 + 4
        mov   ah,0x0F  
        cld
pr_str1: 
        lodsb  
        test al,al 
        jz pr_strd
        stosw  
        jmp pr_str1
pr_strd:
        ret

loadKernelMsg   db      "Loading Kernel ...",13,10,0

How can I obtain that the next String will be printed into a new line.

Thanks in advance

Last edited by qyte on 25 Dec 2006, 00:25; edited 1 time in total

24 Dec 2006, 23:21

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 25 Dec 2006, 00:02

do you understand what your code does? (and how?)

25 Dec 2006, 00:02

qyte

Joined: 13 Aug 2006
Posts: 6

qyte 25 Dec 2006, 00:17

uhm ... of course. do you? ;D

25 Dec 2006, 00:17

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 25 Dec 2006, 00:54

Quote:

Quote:
do you understand what your code does? (and how?)
uhm ... of course

you don't seem to be understanding....

to go to new line, you should write to 0xB0000 + 80*2 (if your screen is 80 characters wide)

25 Dec 2006, 00:54

DOS386

Joined: 08 Dec 2006
Posts: 1903

DOS386 25 Dec 2006, 01:18

Quote:

In protected mode the bytes 12 and 10 are shown as a circle and a not, or something

12 or 13 ? Anyway, I do not think this fact is specific to PM. Razz

Quote:

"Loading Kernel ...",13,10,0

You can drop the "13,10" Razz

and define EOL as 1 or whatever ...

Quote:

to go to new line, you should write to 0xB0000 + 80*2 (if your screen is 80 characters wide)

Right. You need to set up a variable with screen writing address or 2
variables keeping X and Y cursor position, and check the string for EOL value
yourself ...

_________________
Bug Nr.: 12345

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

Status: Closed: NOT a Bug

25 Dec 2006, 01:18

Dex4u

Joined: 08 Feb 2005
Posts: 1601
Location: web

Dex4u 25 Dec 2006, 02:09

You need to write your own functions, go here:
http://bos.asmhackers.net/downloads.php
And get the OS BOS by bubach, in BOS is a inc file called "text.inc" with some good examples.

25 Dec 2006, 02:09

qyte

Joined: 13 Aug 2006
Posts: 6

qyte 25 Dec 2006, 18:17

Thx everybody.
Special thanks 2 Dex. That inc file is really educational especially in setting the cursorpos, scrolling the screen and stuff. Smile

25 Dec 2006, 18:17

rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo 26 Dec 2006, 04:55

BOS seems to work in DOSBOX also (except for "fddtest" and "reboot").

26 Dec 2006, 04:55

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum