Spoiler: Rogue just implements its own Linear Congruential Generator.

    #define RN (((seed = seed*11109+13849) & 0x7fff) >> 1)

I would not be surprised if other contemporaries like glibc, Borland, Watcom, Lattice, etc all did the same. Or did they do something else/better?

Thank you.

I think the algorithm used and the seeding method are very relevant in procedurally generated games like Rogue, Elite and Minecraft so I was disappointed when the author just used Random().

And yes I could have read the code or remembered a previous time whence I might have learnt the same bit of information but instead I read the article.