Abstract: A display apparatus of the invention which detects an obstacle put on a display unit, and modifies a place or manner of a display to be performed, comprising the display unit having a display surface; a detecting unit for detecting a display-obstructed area on the display surface where a display-obstructing factor is present; a shifting unit for shifting the area of displayed contents to a displayable area other than the display-obstructed area, when the display-obstructed area is detected; and a display control unit for displaying the displayed contents shifted by the shifting unit in the area other than the display-obstructed area.

Abstract: There is provided a multi-window display system that realizes simplified operation of window displays. Digital data selected more recently is displayed in a main screen window display section, and a plurality of subsidiary screen window display sections are displayed at progressively smaller sizes relative to the main screen window display section, which is displayed at the maximum size. Moreover, when a window display section is selected and a direction of movement is indicated, the selected window display section is moved in the indicated direction and displayed at an enlarged size. The size of the operation panel window display section corresponding to the selected one of the window display section is changed in accordance with the changing of the size of the selected one of the window display section.

Abstract: A display apparatus of the invention which detects an obstacle put on a display unit, and modifies a place or manner of a display to be performed, comprising the display unit having a display surface; a detecting unit for detecting a display-obstructed area on the display surface where a display-obstructing factor is present; a shifting unit for shifting the area of displayed contents to a displayable area other than the display-obstructed area, when the display-obstructed area is detected; and a display control unit for displaying the displayed contents shifted by the shifting unit in the area other than the display-obstructed area.

Abstract: There is provided a multi-window display system that realizes simplified operation of window displays. Digital data selected more recently is displayed in a main screen window display section, and a plurality of subsidiary screen window display sections are displayed at progressively smaller sizes relative to the main screen window display section, which is displayed at the maximum size. Moreover, when a window display section is selected and a direction of movement is indicated, the selected window display section is moved in the indicated direction and displayed at an enlarged size. The size of the operation panel window display section corresponding to the selected one of the window display section is changed in accordance with the changing of the size of the selected one of the window display section.

Abstract: A memory protective circuit comprising a RAM. An area of the RAM where any writing is inhibited is designated. When there are instructions to write into the area where any writing is inhibited, writing into the area is prevented.