HelenOS sources

DSP_MODE_SIGNED   419 uspace/drv/audio/sb16/dsp.c 	    (pcm_sample_format_is_signed(format) ? DSP_MODE_SIGNED : 0) |
DSP_MODE_SIGNED   495 uspace/drv/audio/sb16/dsp.c 	    (pcm_sample_format_is_signed(format) ? DSP_MODE_SIGNED : 0) |
HelenOS homepage, sources at GitHub