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Method of formatting data from a mouse

  • US 5,125,077 A
  • Filed: 12/10/1990
  • Issued: 06/23/1992
  • Est. Priority Date: 11/02/1983
  • Status: Expired due to Term
First Claim
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1. A method of controlling a cursor on a computer display, the method including:

  • providing a cursor control device having at least first and second buttons, a position sensor, and a serial encoder;

    coupling the cursor control device to a computer using an RS-232 interface that includes first, second and third lines;

    under control of a software driver in the computer, maintaining the first RS-232 line at a first voltage and maintaining the second RS-232 line at a second voltage different than the first;

    deriving from the first and second RS-232 lines an operating voltage to power the serial encoder;

    formatting data from the position sensor and from the first and second buttons into a three byte packet to form a serial data stream using the serial encoder;

    said formatting step including formatting a first byte of said three byte packet to include a bit indicating a status of the first button and a bit indicating a status of the second button; and

    transmitting said serial data stream to the computer using the third RS-232 line while the first and second RS-232 lines are maintained under control of the software driver at said first and second voltages.

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