Youtuber builds mechanical 8-bit computer from K'nex
Shadowman39 has built an 8-bit computer with the help of K'nex construction toys. Despite its imprecise mechanics, the machine solves simple arithmetic problems.
Shadowman39's calculator is made entirely from K'nex parts.
(Image: Shadowman39)
The Youtuber Shadowman39 has built a functional, mechanical 8-bit computer with the construction toy for roller coasters and towers K'nex. The machine can process binary numbers between 0 and 255 or -128 and 127 with a sign and perform simple arithmetic operations. Only K'nex parts were used for the calculator.
Building a calculator from K'nex plastic parts is a major challenge. The construction toy, invented by Joel Glickman in 1992, was originally developed to build skeletal, motorized, and immobile models, such as roller coasters, bridges, and towers. However, K'nex was never intended for precise construction. The standardized parts are made of quite flexible plastic and bend and deform accordingly, so that the plug connections can become loose. Youtuber Shadowman39 has nevertheless managed to build a functional calculator with it.
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Calculator for simple arithmetic tasks
Shadowman39 has mechanically reconstructed an arithmetic logic unit (Arithmetic Logic Unit – ALU) that uses logic gates like early computers. It processes binary-coded numbers between 0 and 255 or -128 and 127, which can be added, subtracted, and compared. The binary numbers are set manually using levers. The values are “stored” in mechanical registers. Each individual register consists of several levers that represent the position 0 or 1.
A system of racks then enables the desired arithmetic operation to be carried out. The machine performs the necessary movements step by step and then displays the final result. This makes each individual calculation step visible and easy to follow.
Shadowman39 explains his mechanical 8-bit computer clearly in a detailed video. The Youtuber plans to post more videos on his YouTube channel, in which he goes into details about the structure, technology, and function of individual components such as the mechanical registers, ROM, and RAM.
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Mechanical calculating machines, which also consisted of cogwheels and moving parts, already existed in the 19th century. They were mostly made of metal, often brass, to perform simple arithmetic operations.
(olb)
