vesa mode code?

[Hans <hans.ullrich@loop.de>]

Hi there,

I am asking myself now for many years, if there is a relationship between the 
solution and the vesacode at the grub commandline.

Of course, there is a table everywhere, where I can see, which resolution is 
at the givenm mode (i.e. vga=791 is 1024x768).

But what does 791 mean? I guess it is 791h, or similar. 

Is it possible (and if yes, how), to compute the code from the wanted 
solution? For example, if I want to have 1440x900, can I compute the 
vga=whatever code? Or must I always look into a table?

I googled, but found only tables, but no satisfying explanations.

Would be nice, if someone could tell me more.

Best 

Hans