PDDuino

Jimmy Petit's original project for Arduino Mega

https://github.com/TangentDelta/SD2TPDD

And here is a fork that adds,

• power saving sleep mode calls
• disk-activity led
• support for the special card-reader hardware on Teensy 3.5/3.6
• the current working directory is displayed in the top-right corner of the TS-DOS display

https://github.com/aljex/SD2TPDD/tree/bkw_teensy36 for Teensy 3.5/3.6

https://github.com/aljex/SD2TPDD/tree/bkw_al32u4 for Adafruit Feather 32u4 Adalogger

https://www.youtube.com/embed/_lFqsHAlLyg