ja_isa
ja.ja_isa.iba_iot = &jcp->jc_eisa_iot;
ja.ja_isa.iba_memt = &jcp->jc_eisa_memt;
ja.ja_isa.iba_dmat = &jcp->jc_dmat_isa;
ja.ja_isa.iba_ic = &jcp->jc_ic;
isabus_attach(self, &ja.ja_isa);