(Now, desktops are 64-bit wide and are able to address billions of bytes of memory). It ran on an old F100-L bus machine with an amazing 16-bit wide memory when most machines were only 8-bit wide. Riddle started development in 1977 and worked on it for two years, getting his Computer Aided Design system operational by 1979. He dumped that one and started over, designing an interactive system. His first CAD program was actually an interpreter and we're talking 2D, at first. Think about that kind of genius for a moment: he was able to write his own high-level language compiler (SPL: System's Programing Language) when existing ones didn't suit his needs. He worked on a 16-bit processor with 64k of addressable space. Riddle, seen in his lab in Arizona, above ( photo courtesy of the DigiBarn Museum), developed his first CAD program in the 70s. It's Riddle's early innovations that set the ball rolling, and it's worth a look back to see how it all began. Autodesk has been around since the early 80s when John Walker and some of his programmer friends founded it as a small company based on their original product, AutoCAD, an early Computer Aided Design program acquired from programmer Michael Riddle.
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