Accessing Video Directly, no Kernel Help

[scu-ba-de-buntu]

So I have a flat binary that is pulled by emulated floppy (Dos) BootRecord and I want to be able to access video memory without any system help. I understand how to place characters in textmode using:


char *TextVideoMemory = (char *) 0xb8000;
...
TextVideoMemory =
{'L','0x7','E','0x7','A','0x7','R','0x7','N','0x7' ,'I','0x7','N','0x7','G'};
...


and I know VGA data is located near 0xa0000, but I am not sure what is the next step. Is it correct to assume that without any system calls, ei no kernel loaded that the screen is 320 by 200 pixels?



Thanks!

[Liiiim]

So this is without a kernel loaded at all? And now you want to draw stuff on the screen? This might be of some help - http://wiki.osdev.org/Drawing_In_Protected_Mode (assuming you're in protected mode).
(http://wiki.osdev.org/Drawing_In_Protected_Mode)

[scu-ba-de-buntu]

Thanks!