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Framebuffer
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== Virtual framebuffers == Many systems attempt to emulate the function of a framebuffer device, often for reasons of compatibility. The two most common [[Virtualization|virtual]] framebuffers are the [[Linux framebuffer]] device (fbdev) and the X Virtual Framebuffer ([[Xvfb]]). Xvfb was added to the [[X Window System]] distribution to provide a method for running X without a graphical framebuffer. The Linux framebuffer device was developed to abstract the physical method for accessing the underlying framebuffer into a guaranteed memory map that is easy for programs to access. This increases portability, as programs are not required to deal with systems that have disjointed memory maps or require [[bank switching]].
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