mailboxlock      1072 dev/isa/aha.c  		    extbios.reply.flags, extbios.reply.mailboxlock);
mailboxlock      1077 dev/isa/aha.c  		unlock.cmd.magic = extbios.reply.mailboxlock;
mailboxlock       187 dev/isa/ahareg.h 		u_char	mailboxlock;	/* mail box lock code to unlock it */