I did something like this in around 1999 too. It was just a headless motherboard in a plastic box running some DOS MP3 player. I had a numeric keypad with a lit

I did something like this in around 1999 too. It was just a headless motherboard in a plastic box running some DOS MP3 player. I had a numeric keypad with a little integrated LCD that I used to control it. I eventually replaced the whole thing with an iPod. Good times.