Ok, Ok, its not really OS dev but i thought you might be experienced in protected mode.
I am using an EGA mono card and the memory is at 0xA000:0000 but when i try to access it directly, it segmentation faults.
And if i try to access it with _fpokeb, the computer reboots for no reason.
It is a 486/33 with 12 megs of ram .

Have you got a valid GDT?

GDT = Global descriptor table?
Protected mode is setup by a dpmi server so i assume so, but i am a noob in protected mode.

Hmm, i thought you were talking about code compiled in GJGPP, running on a bare pc.

Can you describe the environment?
OS?

Its MS-DOS 6.0.

Doesnt MSDOS have an EGA interface or driver???

I meant graphics mode

Yeah I know mate, im not sure if direct acces is allowd to that memory???

But i know there are EGA drivers that provide interrupt service for EGA displays...

Definitely possible:
http://www.allegro.cc/manual/api/direct ... eo-memory/

Help?