Oldest computer still in current use

http://voyager.jpl.nasa.gov/ http://sse.jpl.nasa.gov/missions/jup_missns/jup-p10.html Both Voyagers and one Pioneer are still being tracked, daily for the Voyagers and "occasionally" for Pioneer 10. All are looking for the point where the solar wind finally gets overwhelmed by the local interstellar medium flow (there should be a bow shock in the "upwind" direction). The main instrument being used for the search is a magnetometer, which should register a change in the local magnetic field when the spacecraft crosses the bow shock. Bit rates are very very low (bits per minute type thing, don't know exactly but can find out if you are interested.) The science being addressed is something we have no other way of observing in situ (remote observing missions are being planned) so it's still in practical use if you regard basic scientific research as "practical" (I do, but then, I would). Pioneer 10 was launched 02-Mar-1972, and it's questionable whether you want to claim it contains a "computer" anyway, so it's maybe not relevant to the original question. - Mark