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Conference hydra::amiga_v1

Title:AMIGA NOTES
Notice:Join us in the *NEW* conference - HYDRA::AMIGA_V2
Moderator:HYDRA::MOORE
Created:Sat Apr 26 1986
Last Modified:Wed Feb 05 1992
Last Successful Update:Fri Jun 06 1997
Number of topics:5378
Total number of notes:38326

1705.0. "Mouse Zapped!!! Dead or alive?" by RAVEN1::EVERHART () Tue Sep 20 1988 14:18

    	A friend of mine owns an Amiga 500, and made the stupid mistake
    of trying to connect a Tandy mouse to his second Joyport so that
    he could have two mice for Marble Madness.  Predictably, this caused
    a problem with the Hardware, and his Mouse no longer works properly.
    (The Amiga Mouse)  The joysticks seem to work fine, and the mouse
    buttons work.  He took the mouse to the lab and checked it under
    the oscilloscope, and it seems to check out just fine.  We think
    we've narrowed the problem down to either the DENISE, or a 74HCT157
    that seems to XOR and NOT the signals going to the DENISE mouse
    registers.  Anybody got any idea what the actual problem might be?
    The puzzling thing is that the joysticks work perfectly.  The reason
    I ask is because DENISE is $50, wheras the 74HCT157 is only 65 cents.
    Thanks in advance.
    
     - Chris
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