r20c              469 dev/ic/opl.c   	u_int8_t r20m, r20c, r40m, r40c, rA0, rB0;
r20c              512 dev/ic/opl.c   	r20c = (chars1 &~ OPL_MULTIPLE_MASK) | c_mult;
r20c              541 dev/ic/opl.c   	opl_set_op_reg(sc, OPL_AM_VIB,      voice, 1, r20c);