HelenOS sources

ISR_TXE           559 uspace/drv/nic/ne2k/dp8390.c 	if (isr & (ISR_PTX | ISR_TXE)) {
ISR_TXE            86 uspace/drv/nic/ne2k/ne2k.c 		.value = (ISR_PRX | ISR_PTX | ISR_RXE | ISR_TXE | ISR_OVW |
HelenOS homepage, sources at GitHub