I think the 'port' concept inherits so much abstraction, it changes the meaning and how it really works. When I started out, a port was (and still is) just a d

I think the 'port' concept inherits so much abstraction, it changes the meaning and how it really works. When I started out, a port was (and still is) just a designated memory location, and address, where some process (like a NIC driver) can write byte(s) into it. 'Listening' on a 'port' just meant the memory location is checked by a piece of code either through polling or interrupt driven. The interrupt is triggered by the same process that placed the data into the mem location. Abstraction married to time is a is the enemy of knowledge.