Rx8
wr(scc,R3,Rx8|RxCRC_ENAB); /* RX 8 bits/char, CRC, disabled */
up->curregs[R3] = RxENAB | Rx8;
up->curregs[3] |= Rx8;
uap->curregs[3] |= Rx8;
write_zsreg(uap, 3, Rx8);
write_zsreg(uap, 3, Rx8 | RxENABLE);
write_zsreg(uap, 3, Rx8);
uap->curregs[R3] = Rx8;
up->curregs[R3] = RxENAB | Rx8;
up->curregs[R3] = RxENAB | Rx8;
up->curregs[R3] |= Rx8;
zport->regs[3] |= Rx8;