eisa_intr_string
const char *eisa_intr_string(eisa_chipset_tag_t, eisa_intr_handle_t);
intrstr = eisa_intr_string(ec, ih);
intrstr = eisa_intr_string(ec, ih);
intrstr = eisa_intr_string(ec, ih);
intrstr = eisa_intr_string(ec, ih);