HelenOS sources

DP_TCR            209 uspace/drv/nic/ne2k/dp8390.c 	pio_write_8(ne2k->port + DP_TCR, TCR_NORMAL);
DP_TCR            298 uspace/drv/nic/ne2k/dp8390.c 	pio_write_8(ne2k->port + DP_TCR, TCR_INTERNAL);
DP_TCR            337 uspace/drv/nic/ne2k/dp8390.c 	pio_write_8(ne2k->port + DP_TCR, TCR_NORMAL);
DP_TCR            379 uspace/drv/nic/ne2k/dp8390.c 	pio_write_8(ne2k->port + DP_TCR, TCR_1EXTERNAL | TCR_OFST);
DP_TCR            381 uspace/drv/nic/ne2k/dp8390.c 	pio_write_8(ne2k->port + DP_TCR, TCR_NORMAL);
HelenOS homepage, sources at GitHub