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System wake up circuit for computer

  • US 4,849,919 A
  • Filed: 06/11/1986
  • Issued: 07/18/1989
  • Est. Priority Date: 06/14/1985
  • Status: Expired due to Term
First Claim
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1. An electronic apparatus with peripheral interface means for selectively coupling additional hardware to the electronic apparatus, comprising:

  • central processing means for controlling said electronic apparatus during a system on condition when power is transmitted to said central processing means;

    sub-central processing means for comparing a current time to an alarm time during a system off condition when power is prevented from being transmitted to said central processing means, said sub-central processing means initiating a wake up actuation when said current time and said alarm time are determined to be equal; and

    alarm means for providing an alarm for a predetermined period of time in response to initiator of said wake up actuation, said alarm indicating that selective coupling of additional hardware to said peripheral interface means should be withheld for said predetermined period of time.

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