I had an old Atari 2600 lying around the workshop. I decided to turn it into a dock for my iPod using an amp that can be had off eBay for £10. This amp has a usb connector that will recognise an iPod as well as having a FM radio and remote control. I also managed to port all of the controls that control all the major functions to the original switchers on the Atari.
Power switch LED mod can be found here: https://www.instructables.com/id/Atari-2600-power-switch-LED/