On Tue, 18 Jan 2005, Stefan Reinauer wrote:
Also, the 0x55aa sequence has to be at any 4k boundary within the rom. Before that any data may occur. IIRC the standard does not say that the option rom image has to start at the beginning of the physical chip.
I never saw that requirement adhered to in practice. In fact some vga bioses we have seen have several bios versions in one chip.
ron