How to do basic thing in pm

[codemastersnake]

hi all!

my question is that how can one do some basic things like scrolling the screen up and moving cursor pos in text mode without access to bios interrupts...

[Osbios]

Very simple: use the mem arrea at 0xB8000 for color- or 0xB0000 for monocrt.
nasm example(PMode; GS is a data segemt @0):

Code: Select all

scroll:
mov  eax,0xB8000

 .loop1
  mov ebx,[gs:eax+0xA0]
  mov [gs:eax],ebx
  add eax,4
 cmp eax,0xB8F00
 jne .loop1
 
 .loop2
  mov dword[gs:eax],0
  add eax,4
 cmp eax,0xB8FA0
 jne .loop2
ret

[Phibred]

Take a look at my Operating System [done in NASM] http://individual.utoronto.ca/Phibred/LunarOS.htm that version is a little old however it is a great resource for some video tricks with no BIOS calls. Video.txt [in my current version it is Video.asm but I haven't gotten around to post that one yet]. I hope that helps.

[codemastersnake]

Thanks for that but I know how to output using pointers....

OK Let me make me clear, I have searched net but wasn't able to find out solution to those in C/C++. I found only asm and .pas which I don't want/like.

can any one provide me some code in c or c++ for vesa... or a link

[Phibred]

Wow, VESA is like a good year from where you seam to be right now. I recomend focusing on your Keyboard, Floppy, HDD, and CD-Rom drivers before you even think of VESA.

And don't worry about ASM to C translating. Most of the tutorials that I used were based in C and it does take a little more time, but I believe that you leard more that way.

You really could read my code and I think I actually have the C example for moving the text mode cursor.