Tx8
up->curregs[R5] = TxENAB | Tx8;
up->curregs[5] |= Tx8;
uap->curregs[5] |= Tx8;
write_zsreg(uap, 5, Tx8 | RTS);
uap->curregs[R5] = Tx8 | RTS;
up->curregs[R5] = TxENAB | Tx8;
up->curregs[R5] = TxENAB | Tx8;
up->curregs[R5] |= Tx8;
Tx8 | TxENAB, /* write 5 */
zport->regs[5] |= Tx8;