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Crescent Door Incorporated (CDI) was a short-lived TI-Basic programming group for the TI-83+ graphing calculator. The only member that was active was the founder, Fred Sparks, and the group was eventually disbanded as a result; it should be noted that the founder continued to use the CDI name as an alias.
The CDI group merged with various other TI community sites — Calc Haven (JcCorp), Omnimaga (Kevin Ouellet), TI-Jon (Jon Snyder), and TI-Freakware (Daniel Thorneycroft) — in late 2005 to form the Crescent Door Alliance (CDA), with the programs and games released by the group using the CDA-CDI Games banner.
It was one of the sites that got hosting through CalcGames.
- Notable programs/games (including screenshots)
- Notable tutorials/documents
Fred Sparks released several notable TI-Basic programs games, both pure and hybrid using the xLIB assembly library: Minesweeper Greyscale, Greyscale "Powered by xLIB" Program, Metroid Pure, Animation Studio, Reflex Revolution, Theta Fourteen, XCAPE, A Dot RPG, Text Pong, Game Pack, M1nd Hak3r5, I-Man, and Black Jack Pro 83+.
- Fred Sparks (CDI) — founder
- JcCorp (Calc Haven)
- Kevin Ouellet (Omnimaga)
- Jon Snyder (TI-Jon)
- Daniel Thorneycroft (TI-Freakware)
- List of their important milestones (founding, important programs, etc.)
Crescent Doors Incorporated was started by Fred Sparks in March 2005 with the release Matrix Zipper for the TI-82 graphing calculator.