How do lifts in old HDB estates work?

Question:
i'm refering to lifts that have only one lift button.

Answers:

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http://science.howstuffworks.com/elevato...

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How do you install air shocks on a 1996 buick roadmaster station wagon. front and rear?

They work just the same... I mean they only take into account the floor on which the button was pressed, ignoring whether you want to go up or down. With two button elevators, you specify if you want to go up or down and a mechanism sorts the requests in an optimum order so that the elevator does not have to go up then down then up again, if it could have simply taken both orders and then go down.
If you have only one button, this sorting is no longer performed and the elevator simply carries out the commands in the order they were given.

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