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It is a replacement for the previous Windows 2000 and Windows XP display driver model XDDM/XPDM [3] and is aimed at enabling better performance graphics and new graphics functionality and stability. [2] Display drivers in Windows Vista and Windows 7 can choose to either adhere to WDDM or to XDDM. [4]
The display driver sets the 640×480 graphics mode on the VGA, and allocates about 20 KB of the conventional memory for text, called the simulated video buffer. A DOS/V program writes the codes of the characters to the simulated video buffer through DOS output functions, or writes them directly and calls driver's function to refresh the screen.
The display driver may itself be an application-specific microcontroller and may incorporate RAM, Flash memory, EEPROM and/or ROM. Fixed ROM may contain firmware and display fonts. A notable example of a display driver IC is the Hitachi HD44780 LCD controller. Other controllers are KS0108, SSD1815 (graphics capable) and ST7920 (graphics capable)
In August 2006, Intel added support to the open-source X.Org/XFree86 drivers for the latest 965 series that include the GMA (X)3000 core. [41] These drivers were developed for Intel by Tungsten Graphics. In May 2007, version 2.0 of the driver (xorg-video-intel) was released, which added support for the 965GM chipset.
A 10 × 10-pixel computer display image usually requires many more than 10 × 10 printer dots to reproduce it accurately, due to the limited colours of ink available from the printer; here, a 60 × 60 grid is used, providing 36 times the original density, compensating for the printer's fewer colours.
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Display: Passive matrix color VGA (16 colors (640x480) high resolution, 256 colors (320x200) low resolution) RAM: 4 MB built-in (expandable to a maximum of 8 or 12 MB using an optional 4 MB or 8 MB Compaq branded module, or 20 MB using a third party 16 MB module) 256 KB video memory (512 KB exists in the system, but is not accessible by the GPU.)