The ISEE-3 satellite, launched in 1978, is still functioning and its orbit will bring it back past Earth in August, and 12 of its 13 instruments are still working. Trouble is, NASA scrapped the hardware, and presumably the software they used to control the satellite in 1999. But what would it really take to be able to talk to ISEE-3 again? I assume hardware exists that is flexible enough to send the signals, and software can run on emulators, at a fraction of the costs NASA fears, but could we really? The satellite is by all accounts still in good condition, it'd be a shame to lose this opportunity...