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Computer Architecture and Processing Systems

Automatic teller machines and point of sale terminals

  • 3 things to know
  • AS Unit 2

Overview

Inputs an automatic teller machine takes from a customer, outputs of a cash withdrawal at an automatic teller machine and processing a point of sale terminal performs during a sale.

What you need to know

Answer each one before you reveal it.

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Key term

List the outputs of a cash withdrawal at an automatic teller machine.

Process

Describe the processing a point of sale terminal performs during a sale.

Process

What processing does an automatic teller machine carry out before dispensing cash?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Name the inputs an automatic teller machine takes from a customer.

    Model answer

    An automatic teller machine reads the chip on the customer's card and takes the PIN and the amount requested from the keypad or the touchscreen.

  2. 2

    What processing does an automatic teller machine carry out before dispensing cash?

    Model answer

    An automatic teller machine checks the PIN against the encrypted value held for that account, confirms that the balance and the daily limit allow the withdrawal, and then debits the account.

  3. 3

    List the outputs of a cash withdrawal at an automatic teller machine.

    Model answer

    An automatic teller machine dispenses notes, prints a receipt if one is asked for, displays messages on its screen and returns the card.

  4. 4

    Why does an automatic teller machine encrypt the PIN as soon as it is typed?

    Model answer

    Encrypting the PIN at the keypad means the plain digits never travel across the bank's network where they could be intercepted.

  5. 5

    Why is an automatic teller machine described as working in real time?

    Model answer

    An automatic teller machine adjusts the account balance during the transaction itself, so a second withdrawal a minute later already sees the reduced balance.

  6. 6

    What happens at an automatic teller machine when the link to the bank is unavailable?

    Model answer

    A machine that cannot reach the bank refuses the transaction rather than dispensing money, because the balance and the daily limit cannot be checked.

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