It is a nice pleasant day in South Park, and we're at the South Park Hospital.  The Therac-25 was housed in several hospitals.  There didn't seem to be any problems with the Therac-25 in the beginning.  The Therac-25 was an updated version of the Therac-20.  While a lot of startup tests were done in hardware with the Therac-20, the Therac-25 did most of its tests completely in software.
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