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boards:ecb:scg:start [2019/05/14 09:43]
b1ackmai1er [Board Construction]
boards:ecb:scg:start [2019/05/14 09:52] (current)
b1ackmai1er [Board Configuration]
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-You **must** short one (and only one) set of pins above. These pins allow scaling the audio chip oscillator input. The default configuration is no scaling with an osciallator ​frequency of 2.0MHz which is the maximum frequency allowed by the AT-3-8910 chip. Incorrect setting of the oscillator frequency will result in distorted sound output.+You **must** short one (and only one) set of pins above. These pins allow scaling the audio chip oscillator input. The default configuration is no scaling with an oscillator ​frequency of 2.0MHz which is the maximum frequency allowed by the AY-3-8910 chip. Incorrect setting of the oscillator frequency will result in distorted sound output.
  
 **JP1: TEST2 Enable** **JP1: TEST2 Enable**
  
-Shorting 1-2 will ground the TEST2 pin of the sound controller, otherwise the pin will be disconnected. ​You would normally leave this jumper open. The AY-3-8910 datasheet does not document the functionality of the test configuration.+Shorting 1-2 will ground the TEST2 pin of the sound controller, otherwise the pin will be disconnected. ​This jumper ​is normally left open as the AY-3-8910 datasheet does not document the functionality of the test configuration. However the YM2149 which is compatible with the AY-3-8910 uses Pin 26 to divide the master clock by two when pulled low.
  
 **J21: Interrupt Enable** **J21: Interrupt Enable**
boards/ecb/scg/start.txt · Last modified: 2019/05/14 09:52 by b1ackmai1er
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