HelenOS sources

DP_MAR2           334 uspace/drv/nic/ne2k/dp8390.c 	pio_write_8(ne2k->port + DP_MAR2, 0);
DP_MAR2           672 uspace/drv/nic/ne2k/dp8390.c 	pio_write_8(ne2k->port + DP_MAR2, (uint8_t) (hash >> 16));