From: timriker@gmail.com   
      
   On Monday, July 18, 2022 at 10:15:36 PM UTC-6, Jerry Penner wrote:   
   > I converted a USB wheel mouse to work with the DIN-9 Apple //e mouse    
   > card. I removed the USB driver chip that read the signals from the    
   > phototransistor/LED pairs for the X- and Y-axes and routed them to the X    
   > and Y inputs. The phototransistors output the supply voltage (+5V) when they    
   > detect light, which is perfect for the Apple mouse card.    
   >    
   > The button on the mouse was the wrong sense (active-high), so I inverted    
   > it using a pull-down 10kΩ resistor. That's the value I've seen in Apple    
   > circuits for similar functions, and it worked well.    
   >    
   > I don't have a schematic handy, but that's how it can be done. It does    
   > depend on what you've got for a mouse. The optical mice encode    
   > everything within their controller chips, and output USB data, so that    
   > makes it much harder to use them.   
      
   Thanks for the reply!   
      
   If I can find a PC bus mouse / serial mouse, is that an easier place to start?   
   Is your converted mouse an optical or ball mouse? I'm not sure what the Apple   
   is expecting as a signal. How does it know the difference between moving right   
   and moving left,    
   for example?   
      
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