![]() ![]() 1.4 VBE/accelerator functions (VBE/AF) (August 1996).1.3 VESA BIOS Extensions (VBE core) 3.0 (September 1998).1.2 VESA BIOS Extensions (VBE core) 2.0 (November 1994).In widely used UEFI 2.x systems, the INT 10H and the VBE are replaced by the UEFI GOP. In EFI 1.x systems, the INT 10H and the VESA BIOS Extensions (VBE) are replaced by the EFI UGA protocol. Despite this, it is common that a driver thunk out to the real mode interrupt in order to initialize screen modes and gain direct access to a card's linear frame buffer, because these tasks would otherwise require handling many hundreds of proprietary variations that exist from card to card. ![]() Consequently, the VBE standard has almost never been used for writing a video card's drivers each vendor has thus had to invent a proprietary protocol for communicating with its own video card. Older versions of VBE provide only a real mode interface, which cannot be used without a significant performance penalty from within protected mode operating systems. Most newer cards implement the more capable VBE 3.0 standard. VBE is made available through the video card's BIOS, which installs during boot up some interrupt vectors that point to itself. This is opposed to the "traditional" int 10h BIOS calls, which are limited to resolutions of 640×480 pixels with 16 color (4-bit) depth or less. ![]() ![]() VESA BIOS Extensions ( VBE) is a VESA standard, currently at version 3, that defines the interface that can be used by software to access compliant video boards at high resolutions and bit depths. ( Learn how and when to remove this template message) ( February 2011) ( Learn how and when to remove this template message) Please help to improve this article by introducing more precise citations. This article includes a list of general references, but it lacks sufficient corresponding inline citations. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
January 2023
Categories |