It is well known that id Software's Commander Keen technology was originally designed to host a PC port for Super Mario Bros. 3 and, in 2015, John Romero images revealed of the proof of concept. Nintendo didn’t bet on that, but it was a breakthrough in terms of smooth screen scrolling in PC gaming.
A copy of this demonstration of Mario has appeared in a post to Fort National Game Museum, seemingly at random. Museum game curator Andrew Borman explains Ars Technica that the album was part of the biggest presentation of an unnamed game developer. This developer did not work on the demo, although he received it "during his work."
"It wasn't something I expected to see in this donation, but it was extremely exciting, after seeing the video that Romero shared in 2015," Borman said. The curator imagined the record, ripped off the demo and found it matched Romero’s 2015 video. In addition to the images we’ve seen, there’s a 1-4 level “pretty flat” on the demo.
It's good to hear that the show will be kept, but according to the Ars report, it is not planned to show it to the public. Researchers "and other parties" may submit requests to access it.
Below are the images from Romero’s demo and it’s worth reading Ars Report for more information on the preservation plan.
https://www.youtube.com/watch?v=1YWD6Y9FUuw [/ embed]