Re:Pioneer 10 used an intel 4004 microprocessor (Score 2)

And apart from having a 4004 microprocessor it also featured the following instruments:
Pioneer 10 Instruments

Helium Vector Magnetometer (F)

Plasma Analyzer (P/L)

Charged Particle Instrument

Cosmic Ray Telescope

Geiger Tube Telescope

Trapped Radiation Detector (P/L)

Meteoroid Detector (ENC)(F)

Asteroid-Meteoroid Experiment (ENC)(F)

Ultraviolet Photometer

Imaging Photopolarimeter (ENC) (P/L)

Infrared Radiometer (F)
(this info comes from here, which also has info on it's brother pioneer 11, which died in Dec '95)