Dieter wrote:
somebody wrote:
It almost sounds like what you're asking for is the ability to watch
the 80x25 text framebuffer, scan it periodically for changes, and then
send that out via serial using vt100 codes so as to replicate what one
would see on the VGA screen.
If that is the easiest way for OGC to do it, it sounds like that would work.
This should be straight forward and you can use it for both the
character modes and the graphics modes (which still allow Video BIOS
calls to write text to the screen).
You have a character buffer for 132 X 60 characters (and attributes). A
DMA controller constantly reads it (raster scan). The read character
codes go to a character generator in RAM which outputs the video data to
add to the attributes and this data is written to the screen frame
buffer. You could probably speed this up by having a 'dirty' flag for
each character so that ones that hadn't changed since the last read
would be skipped.
--
JRT
_______________________________________________
Open-graphics mailing list
[email protected]
http://lists.duskglow.com/mailman/listinfo/open-graphics
List service provided by Duskglow Consulting, LLC (www.duskglow.com)
