PCD
if (!(ctr & PCD)) {
ctr &= ~PCD;
if (atppc->sc_ctr_intr & PCD) {
ecr |= PCD; /* data is INPUT */
ecr |= PCD;
if (!(ctr & PCD)) {
if (!(ctr & PCD)) {
atppc_w_ctr(atppc, (ctr_sav & ~IRQENABLE) | PCD);
atppc_w_ctr(atppc, (ctr_sav & ~IRQENABLE) & ~PCD);
if (atppc->sc_ctr_intr & PCD) {
#define nPCD inv(PCD)
ppbus_wctr(sc->ppbus, IRQENABLE | PCD | nINIT | SELECTIN);