PAR_ENAB
up->curregs[4] |= PAR_ENAB;
up->curregs[4] &= ~PAR_ENAB;
uap->curregs[4] |= PAR_ENAB;
uap->curregs[4] &= ~PAR_ENAB;
up->curregs[R4] |= PAR_ENAB;
up->curregs[R4] &= ~PAR_ENAB;