the alpha syntauri system
  a ancient synthisizer concept for the Apple II		    Page No.:H212-5
 
           details and circuitplan of the piano-keyboard part
     of the alpha syntauri		  
      During the distribution of the alpha syntauri system there have been 2 different pianokeyboards common to sales:
a version with 48 keyswitches was distributer with the early systems,
while later systems have been distributed with a 61 keyswich pianokeyboard.
Another difference was that the later version was able to recognize velocity, while the early version didnīt do that.		  
 
This page displays the later common version with 61 keyswitches.

 In the earlier pages the keyboard has been displayed in general. In this part weīll take a closer view to the details of the piano-keyboard part
 of the alpha syntauri before the signals from the keyboard enter the decoder PCB inside of the keyboard case.

 The keyboard has 61 keyswitches. To enable the user to assign each single key of the keyboard to itīs correct part in the circuitplan
 i have numbered the keys in the picture below. According also to this picture and the circuitplan you may recognize the "grouping"
 of each 8 keyswitches in a keyblock. This is also due to the "grouping" inside of the keyboard where 8 keys are collected to one
 group by the related "upper connector bar" and "lower connector bar". This will be explained later in other pictures.
 


 Here is the picture with the numbering of the keyswitches and itīs related "piano keys":


 


 and here is the related circuitplan:



 to recognize the details of the keyswitches here some more pictures of that section:




 and here the second picture from another viewpoint:






 
       
 and here is the pinout of the cable between the Apple II interfacecard and the keyboard:

  
         
         
         
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