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Bill Nagel was one of the pioneers of assembly language for the TI graphing calculators. In particular, Bill Nagel was the first person to release assembly games for the TI-83 and TI-86 graphing calculators, as well as the first assembly shell for the TI-83 and TI-86 (AShell).
Bill Nagel had his own one-person programming group called Aurora Technologies (URL: http://www.icestorm.net/aurora/) from 1997 to 1999, where he released several high-quality assembly games. In fact, he was the first person to release assembly games for the TI-83 and TI-86, as well as releasing the first assembly shell (Ashell and Aurora Shell Enhanced) for the TI-83 and TI-86 calculators. Some of his most notable games include Super Mario 86 and Penguins (the first scrolling platform game on a TI graphing calculator).
Aurora Technologies was founded in Fall 1997 by Bill Nagel.