IRQENABLE
if (ctr & IRQENABLE) {
ctr &= ~IRQENABLE;
ppb_wctr(ppbus, r | IRQENABLE);
ppb_wctr(ppbus, r & ~IRQENABLE);
ppb_wctr(ppbus, IRQENABLE);
ppb_wctr(ppbus, IRQENABLE | AUTOFEED);
ppb_wctr(ppbus, IRQENABLE);
ppb_wctr(ppbus, IRQENABLE);
ppb_wctr(ppbus, IRQENABLE);