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R e.g.: RETURN at 6L
R PRINT at 6R
R (7) Acknowledgement of User Action
R Each time the MCDU user activates an LS key or a mode key, he
R receives an acknowledgement of his action.
R The new page also displays an acknowledgement of the operator
R (insertion of a value in a line, message, etc ...).
R
R Examples:
R If the user wants to enter a value into a field, he will have the
R following messages:
R - 'OUT OF RANGE' if the value is not within the range as expected by
R the system.
R - 'FORMAT ERROR' if the value does not have the correct format.
R - The message 'NOT ALLOWED' is displayed if an incorrect LS key is
R activated.
R
R In case of the call-up of a function, the acknowledgement is made by
R deletion of the asterix '*'. This is next to the function name when
R the call-up is taken into account by the system.
R If the system is not available a message is displayed (e.g 'Printer
R Busy').
R
R (8) MCDU Data Entry
R Data are entered into the computer through the keyboard.
R First the data are entered from left to right into the scratchpad by
R activating the alphanumeric keys on the keyboard (similar to that of
R a type-writer). Only 22 characters may be entered into the
R scratchpad. If more than 22 are entered, they will be ignored. The
R 23rd key press will not be accepted by the computer and the computer
R will give no response.
R After entry of the data into the scratchpad, the date are moved from
R the scratchpad into the correct data field. By activating the
R adjacent LS key, the scratchpad is cleared.
R
R The computer checks the data for format and acceptability (out of
R range, entry not allowed into the field, etc ...).
R If the data are incorrect, the system will leave the previous data in
R the data field and then display the associated message indicating the
R error in the scratchpad. To enter the correct data, the operator must
R do either of the following:
R - Clear the message from the scratchpad by activating the CLR key.
R The data that was incorrect will appear in the scratchpad. The
R operator can then correct the data or clear it out.
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R - Enter new data into the scratchpad. This automatically clears the
R message being displayed and replaces the previous (incorrect)
R scratchpad data with the new data.
R If the entry was rejected because an incorrect LS key was activated,
R the entry will be accepted if the correct LS key is activated.
R To clear the scratchpad of entered or incorrect data, the CLR key can
R be used. One press of the CLR key erases the last character entered
R in the scratchpad. A second press of the CLR key erases the second
R last character. At the third press of the CLR key, all data in the
R scratchpad are deleted. The same process applies if the CLR key is
R held pressed.
R Immediately the last character is cleared, one second later, the
R second character is cleared, after 2 seconds the entire scratchpad
R will be cleared of any data.
R Certain data entries into a field also cause the displayed page to be
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