DATA_REG_W
insw(BASE + DATA_REG_W, data, packet_length >> 1);
outw(BASE + DATA_REG_W, 0);
outsw(BASE + DATA_REG_W, mtod(m, caddr_t), m->m_len / 2);
outw(BASE + DATA_REG_W, 0);
outw(BASE + DATA_REG_W, 0);
outw(BASE + DATA_REG_W, 0);
outsw(BASE + DATA_REG_W, mtod(m, caddr_t), m->m_len / 2);
outw(BASE + DATA_REG_W, 0);
outw(BASE + DATA_REG_W, 0);
tx_status = inw(BASE + DATA_REG_W);
status = inw(BASE + DATA_REG_W);
packet_length = inw(BASE + DATA_REG_W) & RLEN_MASK;