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A Colossus Mark 2 computer being operated by Wrens. The slanted control panel on the left was used to set the "pin" (or "cam") patterns of the Lorenz.
A Colossus Mark 2 computer being operated by Wrens. The slanted control panel on the left was used to set the "pin" (or "cam") patterns of the Lorenz. The "bedstead" paper tape transport is on the right.
A Lorenz SZ42 cipher machine with its covers removed at The National Museum of Computing on Bletchley Park
A Lorenz SZ42 cipher machine with its covers removed at The National Museum of Computing on Bletchley Park
The Lorenz SZ machines had 12 wheels, each with a different number of cams (or "pins"). Wheel number 1 2 3 4 5 6 7 8 9 10 11 12 BP wheel name ψ1 ψ2 ψ3
The Lorenz SZ machines had 12 wheels, each with a different number of cams (or "pins"). Wheel number 1 2 3 4 5 6 7 8 9 10 11 12 BP wheel name ψ1 ψ2 ψ3 ψ4 ψ5 μ37 μ61 χ1 χ2 χ3 χ4 χ5 Number of cams (pins) 43 47 51 53 59 37 61 41 31 29 26 23
Cams on wheels 9 and 10 showing their raised (active) and lowered (inactive) positions. An active cam reversed the value of a bit (0→1 and 1→0).
Cams on wheels 9 and 10 showing their raised (active) and lowered (inactive) positions. An active cam reversed the value of a bit (0→1 and 1→0).
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A human computer, with microscope and calculator, 1952
A human computer, with microscope and calculator, 1952
The Ishango bone, a bone tool dating back to prehistoric Africa
The Ishango bone, a bone tool dating back to prehistoric Africa
The Antikythera mechanism, dating back to ancient Greece circa 150–100 BCE, is an early analog computing device.
The Antikythera mechanism, dating back to ancient Greece circa 150–100 BCE, is an early analog computing device.
Charles Babbage c. 1850
Charles Babbage c. 1850