HelenOS sources

ANAR             1642 uspace/drv/nic/rtl8139/driver.c 	pio_write_16(rtl8139->io_port + ANAR, anar);
ANAR             1716 uspace/drv/nic/rtl8139/driver.c 	uint16_t anar = pio_read_16(rtl8139->io_port + ANAR);
HelenOS homepage, sources at GitHub