 640×400 @ 70 Hz is traditionally the video mode used for booting those VGA-compatible x86 personal computers that show a graphical boot screen (text-mode boot uses 720×400 @ 70 Hz).This convention has been eroded in recent years, however, with POST and BIOS screens moving to higher, and often automatically adapted resolutions dependent on the connected monitor (800x600 as a minimum, but 1024x768, 1280x800, 1440x900 and 1920x1080 are not unknown), taking advantage of EDID data and vector or other resizable graphics, along with use of PS/2 or USB mouse detection instead of relying on keyboard alone, to provide a visual experience much closer to that of a fully booted operating system.Should the detection fail, however, or the user cancel the high-quality graphics (either temporarily with a keyboard shortcut, or permanently via a BIOS setting), the old standard mode is generally reasserted.