WR1_RXALLS
WR1_RXALLS, /* Rx per char, No Tx */
WR1_RXALLS | WR1_TXENBL, /* Rx per char, Tx */
sioreg(REG(0, WR1), WR1_RXALLS); /* Interrupted All Char. */
sioreg(REG(1, WR1), WR1_RXALLS); /* Interrupted All Char. */