MPEE
np->rv_ctest4 |= MPEE; /* Master parity checking */
OUTB(np, nc_ctest4, (np->rv_ctest4 & MPEE));
if ((dstat & MDPE) && (np->rv_ctest4 & MPEE)) {
np->rv_ctest4 &= ~MPEE;
np->rv_ctest4 |= MPEE; /* Master parity checking */