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Method for distinguishing between a 386-type central processing unit and A 286-type central processing unit

  • US 5,490,267 A
  • Filed: 05/23/1995
  • Issued: 02/06/1996
  • Est. Priority Date: 08/03/1987
  • Status: Expired due to Fees
First Claim
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1. A method of operating an integrated circuit logic device to determine its type by executing a computer program, said logic device selected from a group of logic device types, said method comprising the steps of:

  • performing a load operation to a register of said logic device with a selected data word, said register having a certain bit therein which is writable by side load operation for logic devices of a first type of said group of logic device types, and which is not writable by said load operation for logic devices of a second type of said group of logic device types; and

    testing said certain bit of said register to determine if said certain bit is writable by comparting said certain bit with the corresponding bit in said selected data word;

    wherein said logic device is identified as of said first type or of said second type based on the result of said testing step.

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