I got a Pi Zero W into a cassette tape and I'm using it to emulate a ZX Spectrum. I had to do some severe trimming but it works well and that
1981 Portable VCR Raspberry PI Media Centre : 12 Steps (with Pictures) - Instructables
Cassette deck in an old Ferrari, Pi-fied - Raspberry Pi
Rewind: This Raspberry Pi cassette player plays Spotify tunes from actual tapes - CNET
1979 Bang & Olufsen Raspberry Pi Internet Radio : 10 Steps (with Pictures) - Instructables
Cassette is not dead inspired Raspberry Pi case @Raspberry_Pi #piday # raspberrypi « Adafruit Industries – Makers, hackers, artists, designers and engineers!
Building a Cassette Tape Pitch Mod with a Raspberry Pi Pico - Hackster.io
ZX Spectrum Raspberry Pi Cassette — The MagPi magazine