Ohio Scientific
![Ohio Scientific Challenger 2P, with optional double disk unit. On display at the Musée Bolo, EPFL, Lausanne.](/Images/godic/202502/14/Challenger_2P-IMG_41372709.jpg")
![Ohio Scientific Challenger 4P](/Images/godic/202502/14/OSI_Challenger_4P2709.jpg")
![Superboard II in a home built wooden case meant to mimic the extremely popular Apple II computer](/Images/godic/202502/14/Ohio_Scientific_Superboard_cabinet2709.jpg")
![Superboard II - single board computer with home built case opened](/Images/godic/202502/14/Ohio_Scientific_Superboard2709.jpg")
Ohio Scientific Inc. (also known as Ohio Scientific Instruments) was a United States computer company that built and marketed microcomputers from 1975 to 1981. Their best known products were the Challenger series of microcomputers, but they also sold a variety of computer kits, single-board computers and various peripherals.