Table graphic elements to produce a graphic element menu, table will be required for a variety of characters numbered graphics and memory mapping method used to display the upper left part of the screen, position the cursor on the screen drawing area of the right part. Upper and lower, left and right cursor control keys to control cursor movement in four directions, do not show the trajectory and at the same time to control the cursor position does not exceed drawing district boundaries. When pressed to seek a number key when the cursor position in response to number shows graphics characters, and then move the cursor, and then display a graphic character, and finally draw a graph composed by the characters. ESCape key pressed, exit procedures, return to DOS.

Display_IO_Programming.doc

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