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Data terminal and method of protecting memory items stored in non-persistent memory in a data terminal

  • US 5,717,936 A
  • Filed: 12/19/1995
  • Issued: 02/10/1998
  • Est. Priority Date: 12/19/1995
  • Status: Expired due to Fees
First Claim
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1. A data terminal comprising:

  • a persistent memory for persistent storage of user information items;

    a non-persistent memory for temporary storage of user information items, the non-persistent memory being coupled to the persistent memory and including at least a first information item and an indicator indicating whether the first information item has been stored in the persistent memory;

    a power supply supplying power to the data terminal, the power supply comprising a power supply rail and a battery;

    a power fail detector responsive to the power supply rail for detecting a power fail state in the power supply rail; and

    a switching element connected between the battery and the non-persistent memory and responsive to the indicator in the non-persistent memory to selectively couple the battery to the non-persistent memory and to selectively cause the battery to supply power to the non-persistent memory dependent on the indicator and on the power fail detector.

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