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AN #21 - ASCII input with 3x4 keyboard matrix
This application note is written by John van der Putte
The program uses a 3x4 keyboard matrix to input ASCII.
The output is placed on the LCD-display and will be saved in the variable TEXT.
If one key is keyed several times the characters of that key rotates at the cursor.
When no key is pressed the cursor shifts to the next display-position after a while.
This time can easily be changed.