The following is the TRON Universe Timeline, which features both confirmed and unconfirmed dates. TRON and TRON: Legacy are on the same canon, but TRON 2.0 is a different canon.
Please note that several sources are contradicting each other with dates.
Timeline of TRON motion pictures and the Evolution games.
It is during this decade that the Master Control Program, an administrative program that oversees ENCOM's mainframe, and its Game Grid, is developed. Ed Dillinger, a programmer at ENCOM, secretly begins to write codes into the MCP that tells the program to steal functions from other programs.
1978
Kevin Flynn, one of ENCOM's brightest software engineers, codes "Space Paranoids", "Matrix Blaster", "Vice Squad" and two other high profile video games.
Ed Dillinger steals Flynn's programs and presents ENCOM with five video games that he claims as his own.
Ed Dillinger gets promoted among the ranks of ENCOM. He soon reaches as Executive V.P. of the company.
Alan Bradley, also a programming engineer, starts coding Tron, an independent security program that monitors all contacts between ENCOM and other systems.
Flynn and Lora end their relationship.
Alan and Lora get together in a relationship.
Flynn writes his best program yet, Clu, with the purpose of breaking into security systems.
Lora begins 'Matter Transform' tests using a laser that dismantles the molecular structure of objects in a process called digitization.
Flynn starts using Clu to hack ENCOM's system and periodically tries reading the different mainframe's memory modules to reconstruct the file he needs as solid evidence to prove he's the one who programmed the video games.
The MCP has become 2,415 times smarter since Ed Dillinger wrote it.
Sep. 22. Mr. Dillinger shuts down access to all Group-7 personnel. Alan is denied access to his Tron program.
Lora, working together with Dr. Gibbs, finish yet another 'digitizing' test. Her theory of a scanned U-V laser beam being superior to single pulse exposure is a success.
Flynn sets an all-time world record in 'Space Paranoids' with 999,000 points.
Alan, Flynn and Lora use a terminal from within ENCOM to forge a Group-6 access, planning to get into the system to activate Tron and use it as a means of shutting down the MCP and retrieve the evidence.
Flynn gets digitized into the Game Grid by the MCP while trying to access the mainframe. He succeeds in retrieving and printing the file needed as evidence after derezzing the MCP with Tron and Yori's help. He also becomes ENCOM's CEO.
Beyond 1982
Kevin Flynn's ascension to leadership of ENCOM brings about many years of stability for the company.
1983
Kevin Flynn is reinstated as an employee of ENCOM and gets promoted as V.P. Creative Development. (Source)
Flynn redesigns the Grid to his own specifications.
Flynn creates Clu 2 to watch over the Tron system in his absences, which began to anger Clu whenever he needed Flynn's permission to make major changes to the Grid, making him think he's been set up to fail his function of perfecting it. Over time begins to declare himself the creator of the Grid and decides to create his version of "the perfect system" by ruling over the Tron system without Flynn's permission. He intends to imprison Flynn after he refuses Clu's wish to destroy self-created programs called ISOs.
Flynn disappears, leaving Sam as a orphan but shareholder of ENCOM's stock. (Source)
2000s
2010
December
Sam Flynn infiltrates ENCOM and releases ENCOM OS-12 to the world, free of charge.
Alan Bradley tells Sam that he had received a page from Flynn's Arcade. Sam goes to investigate and gets digitized into the Tron system.
Sam Flynn emerges from the Tron system, accmpanied by Quorra, with a new outlook on life.
In a shocking announcement, Sam Flynn seizes control of ENCOM and names Alan Bradley as ENCOM's new chairman of the board.
TRON 2.0 Timeline
The events of TRON 2.0 are structured as a sequel of sorts to the events of TRON. They are regarded as non-canon within the TRON franchise.
Note: The following section contains information that appears in the TRON 2.0 storyline, which has been classed as non-canon with the TRON mythology and takes place in an alternate timeline.