HelenOS sources

CR_DM_RW          150 uspace/drv/nic/ne2k/dp8390.c 	pio_write_8(ne2k->port + DP_CR, CR_DM_RW | CR_PS_P0 | CR_STA);
CR_DM_RW          235 uspace/drv/nic/ne2k/dp8390.c 	pio_write_8(ne2k->port + DP_CR, CR_DM_RW | CR_PS_P0 | CR_STA);
HelenOS homepage, sources at GitHub