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Researchers will be able to gain a deeper understanding of what’s considered the world’s oldest surviving (digital) computer after its long-lost user manual was unearthed. The Z4, which was built in 1945, runs on tape, takes up most of a room and needs several people to operate it. The machine now takes residence at the Deutsches Museum in Munich, but it hasn’t been used in quite some time.

An archivist at ETH Zurich, Evelyn Boesch, discovered the manual among her father’s documents in March, according to retired lecturer Herbert Bruderer (via Motherboard). René Boesch worked with the Swiss Aeronautical Engineering Association, which was based at the university’s Institute for Aircraft Statics and Aircraft Construction. The Z4 was housed there in the early 1950s.

Among Boesch’s documents were notes on math problems the Z4 solved that were linked to the development of the P-16 jet fighter. “These included calculations on

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The manual would give researchers a better understanding of how the early computer functioned.

The operating manual of the world’s oldest digital computer has been unearthed in a pile of documents in Zurich, according to a blog post from the Association of Computing Machinery written by retired ETH Zurich lecturer Herbert Bruderer.

The manual would give researchers a better understanding of how the early computer functioned.

According to Bruderer, Zuse Z4 is considered the oldest preserved computer in the world. Built in 1945, the room-sized machine runs on magnetic tapes and needs several people to operate it.

Currently, it is housed at the Deutsches Museum in Munich, but hasn’t been used in quite some time. Researchers and historians have had little knowledge of the device since the manual was lost long ago.

Evelyn Boesch, an archivist at ETH Zurich University discovered the manual among her father’s documents in March, Bruderer

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