Modern arcade emulators are able to handle this difference in screen orientation by dynamically changing the screen resolution to allow the portrait oriented game to resize and fit a landscape display, showing wide empty black bars on the sides of the portrait-on-landscape screen.
Portrait orientation is still used occasionally within some arcade and home titles (either giving the option of using black bars or rotating the set), primarily in the vertical shoot 'em up genre due to considerations of aesthetics, tradition and gameplay.
Modern display rotation methods
Many modern video cards offer digital screen rotation capabilities. But in order for it to be used correctly, a special rotating display is required that is designed to be pivoted.
Rotation of CRT monitors
Very few CRT monitors made today are designed to permit rotation into portrait mode. It is not wise to turn a standard CRT monitor or television on its side due to a number of technical issues:
* The cooling vents are normally designed for natural air convection flow from bottom to top; turning the case sideways can lead to unintended heat buildup and component failure.
* The typical CRT monitor plastic case is not designed to sit stably when turned sideways without a custom-made supporting stand.
* The weight of a large CRT is typically meant to bear on the base frame. A plastic case may flex or crack if the CRT weight is supported only by the thin plastic surround.
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