In 1970, Princeton had an IBM 91 computer. It covered the floor of a building. It had two giant racks of bipolar memory (256 bits/chip) with 1 MB in each rack

In 1970, Princeton had an IBM 91 computer. It covered the floor of a building. It had two giant racks of bipolar memory (256 bits/chip) with 1 MB in each rack. It had an office for several IBM employees who managed the machine. On day an IBM tech was bringing up the system using a check-list. He noticed a red light that said "temperature". He noted it in the log and kept going. It turns out he had forgotten to turn the water on. After a short while the room filled with smoke. The machine was ruined. After the machine was replaced, the IBM office kept one of the old PC boards on the wall. It was curled up like a potato chip.