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Commodore Amiga filter test

 

 

 

commodore amiga500

  audio demo trend price : 50-100€
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Commodore AMIGA ANALOG FILTER TEST

 

This simple test will compare some samples recorded straight from an amiga 500 with filter enabled and disabled.

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editFOREWORD the AMIGA sound processor is "PAULA" MOS8364 which is able to generate 4 PCM voices at 8 bits resolution with a frequency rate up to 27/28 kHz. The Paula ouputs are chained to a static analog 2-poles Butterworth low-pass filter for the whole 4 channels with an attenuation about 7000 Hz. Amiga fixed LPF can be deactivated by software (in this case the red LED turns OFF or dimes depending on Amiga model).

paula

 

audio filter
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test

edit TEST 1 just recorderded a Roland TR808 analog drum machine with an amiga 500:

amiga low pass filter
demo filter enabled
demo filter disabled
   
demo A/B WAVEFORM
demo A/B SPECTRAL

 



editTEST 2 playing a piano sample from soundtracker library on 3 octaves, first with filter on then disabled.

amiga low pass filter
demo piano sample octave1: first enable
demo piano sample octave2: first enable
demo piano sample octave3: first enable
   
demo A/B WAVEFORM
demo A/B SPECTRAL



 

editTEST 3 just alternating the filter on the soundtrack from Shadow of the Beast II by Psygnosis

shadow beast 2
demo alternating filter on and off
   
demo A/B WAVEFORM
demo A/B SPECTRAL

 



 

 

 

 

 

 


manual
SCHEMATICS / SERVICE MANUAL

 

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Commodore Amiga 500 FOR SALE

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drum pad amiga circuit


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Commodore Amiga Paula filter 4.0 out of 5 based on 1 ratings. price €10