RE: Converting/Playing WAV files

From: Richard Atkinson (
Date: 2000-05-18 11:13:38

On Thu, 18 May 2000, Marko Mäkelä wrote:

> Yep, basically you use the master volume register (the low nybble of
> $d418) as a 4-bit D/A converter.  It works, because the master volume
> control also amplifies the DC bias offset (which probably wasn't intended,
> and the amplification was reduced in the 85xx series SID, which makes
> digital samples play very quiet on newer C64s).

Although, contrary to popular belief, you can actually do something about
this in software - to make samples play loud on all C64s, generate some
additional DC offset by setting each oscillator to 0 pulse width and
turning them on with pulse waveform, maximum sustain.

It might also be possible to get some extra offset with certain filter


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