reg3              625 dev/isa/ess.c  	u_char reg3;
reg3              753 dev/isa/ess.c  			reg3 = reg2 ^ 0xff;  /* toggle all bits */
reg3              759 dev/isa/ess.c  			ess_write_mix_reg(sc, 0x69, reg3);
reg3              762 dev/isa/ess.c  			    ess_read_mix_reg(sc, 0x69) == reg3)