The $20 C64 Tape Emulator
A really nice board design can be found here: https://github.com/arananet/tapuinomini1.03 And a write up here: http://arananet-net.kinja.com/tapuino-1-03-mejorando-el-tapuino-mini-1788202676 These schematics are also provided in the "layout" folder as a convenience.
Portions of this code are copyright by their respective owners:
PetitFatfs: Chan: http://elm-chan.org/fsw/ff/00index_p.html I2C code: Peter Fleury firstname.lastname@example.org http://jump.to/fleury LCD code: conversion of the Arduino code apparently by DFRobot? (converted to C by me)