4-bit framebuffer?

What's the "vga=*" number to set the framebuffer to 640x480 16 colors? (not "vga=vga16", because that only works on a Amiga platform, not a PC)

Here are some PC display modes from answers.com:

http://www.answers.com/topic/pc-display-modes-details

Here you go, all the available vga modes.

Code:

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colour depth    | 640x480  800x600  1024x768 1280x1024
256        (8bit)|  769      771      773      775
32000    (15bit)|  784      787      790      793
65000    (16bit)|  785      788      791      794
16.7 Mill.(24bit)|  786      789      792      795

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Use each number as e.g, vga=769, that will give you the desired mode you're looking for, once you choose the right one.