By pressing the <SHIFT> key followed by
the <RIGHT ARROW> key, the graphic
display's contrast increases to the allowed
maximum, and then returns to 0 value.
NUMERIC KEYS: allow the entry and
display of the main numeric symbol. If the
<SHIFT> has first been pressed, the choice
of alternative alphabetic characters will be
SPACE KEY: allows the introduction of a
blank space. If the <SHIFT> has been
alternative characters will be activated.
ENTER KEY: allows validation of what has
PROTECTED RESET KEY:
it is activated by inserting a
blunt object in the slot while
simultaneously pressing the