IRQENABLE
ppb_wctr(ppbus, IRQENABLE);
ppb_wctr(ppbus, IRQENABLE);
ppb_wctr(ppbus, r | IRQENABLE);
ppb_wctr(ppbus, r & ~IRQENABLE);
i = IRQENABLE | PCD | STROBE | nINIT | SELECTIN;
i = IRQENABLE | PCD | nINIT | SELECTIN;
i = IRQENABLE | PCD | nINIT | SELECTIN;
ppb_wctr(sc->ppbus, IRQENABLE | AUTOFEED);
ppb_wctr(sc->ppbus, IRQENABLE);
if (ctr & IRQENABLE) {
ctr &= ~IRQENABLE;