Award BIOS logo
Award BIOS logo (also known as EPA or AWBM) is a family of image formats associated with Award BIOS firmware. These formats are used by those who wish to change the image shown on the boot screen of certain computers. The default image is usually an "Energy Star" logo.
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Format
There are at least two main versions of the format, sometimes called "version 1" and "version 2". Additionally, different versions of the BIOS have different restrictions on the size of the image, etc. There is evidence that different BIOS versions may even render the same file differently.
Version 1
Version 1 images are rendered in text mode, by customizing the character graphics. Consequently, each 8×14 cell of pixels can only use two different colors.
There is no identifying signature, but most files begin with 0x11 0x06 or 0x11 0x09, based on the usual dimensions of the image in cells.
There are usually two images in the file, the second being the small blue Award logo that also appears on the boot screen.
Version 2
Version 2 files begin with a signature of "AWBM". This is a more typical kind of image format, not based on character graphics. It appears to support at least 4- and 8-bit paletted images.
