Overflow bit?

Discussion in 'General Electronics Chat' started by Razor Concepts, May 25, 2009.

  1. Razor Concepts

    Thread Starter Active Member

    Oct 7, 2008
    212
    1
    I am looking at the PS/2 mouse protocol. I found nice information here:
    http://www.computer-engineering.org/ps2mouse/

    There are two bits for X overflow and y overflow, if the change is greater than 255. I am a little confused over how this works. So say if the change is 256 for X, will the X overflow bit be 1, and the X movement byte be 00000001?

    Thanks!
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Your link gives a DNS lookup error.
     
  3. Ratch

    New Member

    Mar 20, 2007
    1,068
    3
    Razor Concepts,

    No, the overflow bit will be set, and the X movement byte will be 0.

    Ratch
     
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