Describe about Key-code Data Formats and FIFO Status Word formats.
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A key code is used after a valid and authentic key closure.
It is entered in the FIFO RAM as a bytecode in the scanned keyboard mode.
The Keycode mode is a 3-bit content of the internal row counter.
It contains the SHIFT and CNTL keys in the format.
The FIFO status word is used to show an error in the keyboard and strobed input mode.
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