sc_pfirstintr    2009 dev/audio.c    			totdelta = t - sc->sc_pfirstintr - sc->sc_pblktime * sc->sc_pnintr;
sc_pfirstintr    2016 dev/audio.c    			sc->sc_pfirstintr = t;
sc_pfirstintr     140 dev/audiovar.h 	u_long	sc_pfirstintr;	/* first time we saw a play interrupt */