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Windows accelerator

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A Windows accelerator, or generically a GUI accelerator, was a type of graphics processing unit for personal computers with additional acceleration features like 2D line-drawing, blitter, clipping, font caching, hardware cursor support, color expansion, linear addressing, and pattern, polygon and area fills. This functionality was marketed for accelerating programs that used graphical user interfaces (GUIs), namely Microsoft Windows. Windows accelerators have been superseded by multipurpose GPUs, which include acceleration for 3D graphics.