The Korean company BTO (Beyond the Ordinary) have created an internal cassette deck player for PC, called
Plusdeck. It can be used to play music but, if we're not mistaken also to store (small) files, just like in the old days. Of course, we are wondering if MSX emulators could support this tape deck, in a similar way to the MSX Game Reader, allowing you to use real MSX tapes on PC with emulators.
Relevant link:
Plusdeck
