The primary UoSAT-2 spacecraft computer

The UoSAT-2 spacecraft incorporates two ground-programmable computers. The primary computer is based around an RCA 1802 microprocessor and is intended for general-purpose management and data collection purposes within the spacecraft, whilst the secondary computer, based on the National Semiconductor NSC-800 microprocessor, controls the Digital Communications Experiment and has a more limited interface to the rest of the spacecraft. This paper describes how the experience gained from operating the UoSAT-1 spacecraft led to an enhanced primary computer design on UoSAT-2.