MAXMODBUS
pdc_scanbus(self, &nca, MAXMODBUS, 0, 0);
pdc_scanbus(self, ca, MAXMODBUS, 0, 0);
pdc_scanbus(self, &nca, MAXMODBUS, regs->io_io_low);
pdc_scanbus(self, &nca, MAXMODBUS, 0, 0);
pdc_scanbus(self, &nca, MAXMODBUS - 1, 0, 0);
pdc_scanbus(self, &nca, MAXMODBUS - 1, hpa, 0);
pdc_scanbus(self, &ga->ga_ca, MAXMODBUS, 0, 0);
pdc_scanbus(self, &nca, MAXMODBUS, HPPA_FPA, 1);
pdc_scanbus(self, &nca, MAXMODBUS, HPPA_FPA, 0);
pdc_scanbus(self, &nca, MAXMODBUS, 0, 1);
pdc_scanbus(self, &nca, MAXMODBUS, 0, 0);
bus_walk(NULL, MAXMODBUS);
bus_walk(NULL, MAXMODBUS);
bus_walk(&dp, MAXMODBUS);
bus_walk(&dp, MAXMODBUS);
bus_walk(&dp, MAXMODBUS - 1);