A quote from the report: > Related problems were found in the Therac-20 software. These were not recognized until after the Therac-25 accidents because the The

A quote from the report: > Related problems were found in the Therac-20 software. These were not recognized until after the Therac-25 accidents because the Therac-20 included hardware safety interlocks and thus no injuries resulted. The safety fuses were occasionally blowing during the operation of Therac-20, but nobody asked why.