RxINT_MASK
regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
up->curregs[R1] &= ~RxINT_MASK;
up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
uap->curregs[1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
uap->curregs[R1] &= ~RxINT_MASK;
regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
up->curregs[R1] &= ~RxINT_MASK;
up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
zport->regs[1] &= ~(RxINT_MASK | TxINT_ENAB);
zport->regs[1] &= ~RxINT_MASK;