Description: Requested by the Q key to return to the operating system, according to other key sequence shows the beginning of 256 kinds of ASCII characters. Shows that every time is key right on the screen left of the slash to show the same string of characters, off an adjacent next character (ASCII value 0 from the beginning of each incremental value of 1). And ask every 5 seconds the screen corner displays a smiley face characters, the characters alternately smiling face.
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zd.asm
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