Operation History - HTC T-Mobile G1 User Manual

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 To enter numbers or operators, tap their respective keys on the keypad. The key
flashes red when tapped. Make sure that you see the red flash before entering
your next number or completing the operation.
To delete numbers one at a time, tap CLEAR. To delete all numbers at once,

tap and hold CLEAR.
To clear the display and start a new calculation, tap and hold CLEAR, or

press

Operation history

To scroll through your operations, roll the TRACKBALL up or down.
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To clear your operation history, press MENU and tap Clear history.
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