6581 signifies the MOS Technology 6581 sound chip, found in the Commodore 64 line of computers. 6581 is often referred to as the "old SID", since it was the first of two models - the 8580 followed in newer models of the Commodore 64. More information at Wikipedia).
This tag is related to all instances of the C64 music composition software Future Composer. For the Amiga series of the same name, see here.
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