OSDev.org

The Place to Start for Operating System Developers
It is currently Thu Mar 28, 2024 1:25 pm

All times are UTC - 6 hours




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: Changing hardware font
PostPosted: Thu Aug 02, 2001 11:00 pm 
I want to change the hardware font for my OS. Does anyone know where
I can get some information on doing this? Thanks.


Top
  
 
 Post subject: RE:Changing hardware font
PostPosted: Thu Aug 02, 2001 11:00 pm 
>On 2001-08-03 02:16:41, Hillbillie wrote:
>I want to change the hardware font for my OS. Does anyone know where
>I can get some information on doing this? Thanks.

VGA has four "planes". Call them plane 1,
plane 2, plane 4, and plane 8.

In text mode, plane 1 = text,
plane 2 = attribute bytes,
plane 4 = font,
plane 8 = ???

To change the font:
- turn off planes 1 and 2,
and turn on plane 4
- turn off Even-Odd mode
- write the font to framebuffer
memory (B800:0000)
- turn on Even-Odd
- turn off plane 4,
and turn on planes 1 and 2

Font characters can be up to 32 pixels high.
Characters are always 1 byte wide (8 pixels).
Each font character is 32 bytes exactly.

http://www.execpc.com/~geezer/temp/90x60.c


Top
  
 
 Post subject: RE:Changing hardware font
PostPosted: Thu Aug 02, 2001 11:00 pm 
Thanks, Chris. Good code example. Are there any other online resources
about it you know of?


Top
  
 
 Post subject: RE:Changing hardware font
PostPosted: Thu Aug 02, 2001 11:00 pm 
>On 2001-08-03 12:34:53, Hillbillie wrote:
>Thanks, Chris. Good code example. Are there any other online resources
>about it you know of?

(docs) Finn Thøgersen's VGADOC
http://home.worldonline.dk/~finth/

(docs) FreeVGA
http://www.goodnet.com/~tinara/FreeVGA/home.htm

(docs) IBM RS/6000 manual, Appendix A - VGA Programming Model
http://www.rs6000.ibm.com/resource/tech ... p.mak.html

(code) Tauron VGA utilities
http://home.onestop.net/kinfira/tauron/tauron.ftml


Top
  
 
 Post subject: RE:Changing hardware font
PostPosted: Fri Aug 03, 2001 11:00 pm 
Thank a lot!


Top
  
 
 Post subject: RE:Changing hardware font
PostPosted: Fri Aug 03, 2001 11:00 pm 
Thank a lot!


Top
  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 6 hours


Who is online

Users browsing this forum: Google [Bot] and 61 guests


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 post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group