So Zedy, can you tell me anything else about them like who wrote them (someone @ NCR, or a user)? I know the source code might be impossible to find anymore, if it exists at all, but did you ever see the source code for those particular games?
I wrote Star Trek when I worked for NCR in Adelaide, South Australia, in the 1970s. I have no idea what happened to the source code, but I believe it's still floating around somewhere.
The way I wrote it was by taking an inferior text-based version that ran on Data General and rewrote it all in COBOL on the 8250 we had in our office. (After I left NCR to work for Wang in 1979, I took the code with me and modified it to run on Wang VS COBOL.)