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   comp.sys.atari.st      Discussion about 16 bit Atari micros      15,439 messages   

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   Message 13,638 of 15,439   
   Michael Schwingen to P Slegg   
   Re: Keyboard weirdness   
   30 Sep 08 17:55:17   
   
   From: news-1171796400@discworld.dascon.de   
      
   In article ,   
   P Slegg  wrote:   
   >Something weird has started happening with my Milan keyboard.   
   >   
   >Last week I was having problems getting some keys to respond. I   
   >assumed it was the batteries in the wireless keyboard but the   
   >leds on the receiver puck wer falshing every time I tapped   
   >a key. I changed the batteries anyway.   
   >   
   >It has happened intermittently since but today it was working fine   
   >as I was using Texel. Then it suddenly stopped responding to lots   
   >of keys, particularly up, down, left right but Shift-up, down,   
   >left and right still worked.   
      
   Does this still happen if you remove the mouse?   
      
   I have seen erratic keyboard/mouse behaviour when the +5V supply for the   
   PS/2 ports (keyboard and mouse) is broken: if a device draws too much   
   current, a PCB trace may blow. In that case, the +5V supply to both ports is   
   broken, and keyboard/mouse get their power only from the pullup resistors on   
   the data lines. If this works depends on the exact model of keyboard/mouse,   
   and usually it works better when only one device is plugged in.   
      
   Anyway, you should try:   
    - a different keyboard/mouse, preferrably a non-wireless model   
    - measuring the +5V on either port when both keyboard and mouse are plugged   
      in   
      
   If the +5V supply is faulty, this can be fixed by soldering a small wire on   
   the PCB.   
      
   cu   
   Michael   
   --   
   Some people have no respect of age unless it is bottled.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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