Words change their meaning over time.
For example, I guess or deduce that the original meaning of the word yet was "now", "at the present time". And from that meaning the opposite secondary meanings of "still" and "already" developed.
When I was child I thought that yet only meant already, as in "Are we there yet?".
But that doesn't seem to make sense in the song "Bendemeer's stream".
I think: "Is the nightingale singing there yet?"
probably does not mean he is wondering if the nightengale has already arrived and started singing. Instead it probably means he wonders if the nightingale is still singing there.
The storytelling logic of the song tells me that in "Bendemeer's stream" "yet" means "still", the exact opposite to "already", the meaning I am much more familiar with. And thus from that one line in a song I deduce that "yet" probably originally meant "now".
On 19th century paddlewheel steamers a wooden platform bridged the gap between the tops of the two semicircular wheelhouses and was used to command the ship from. After decades of commanding and steering paddlewheel ships from their bridges, the command platform on propeller steamships continued to be called the bridge, and so on until the 24th century starships and beyond.
The writers of TOS may have imagined that computer tapes would still be used in the era of Star Trek and so called the small transportable data storage units "tapes", but with our modern knowledge of more advanced computer data storage, we can imagine that in the alternate universe of Star Trek which branched off from ours before World War II, small transportable computer data storage units are still called "tapes" for the same reasons that the command center of a starship is still called the "bridge".
And here is a link to a similar question.
Why does the Star Wars universe use such a primitive technology as data-tapes?1