I have been given my father's old computer, which currently runs Windows 95 and has a 133-MHz processor, a Pentium(r) according to "My Computer". It seems a shame to recycle it when it works so well (considering what it is), so I'd like to load some variant of Unix on it and learn some stuff. I happen to have a copy of "Unix for Dummies" 4th edition (copyright 1998), but it assumes someone has already set up Unix on the computer in question, so I need another source for this step.
There are several existing questions on here about the Unix-on-old-computer thing (typically Linux), except for one major issue: I specifically want a Unix system without a GUI and I cannot for the life of me find simple instructions for getting that. There's people looking for GUIs for their Linux servers and people looking to temporarily remove the GUI, but nothing whatsoever about how to get an old-school, pre-GUI Unix. It's not going to be used as a server, but to pretend I'm in a long-gone decade doing programming, file-editing, etc. on my desktop with just text.
So, what Unix should I use, and how do I get it?
The very fact that I have to ask may mean I'm in over my head, but I have to start somewhere.
P.S. The computer has an ethernet card but I'm fairly certain it has no means of using wifi, so it may remain disconnected from the Internet unless it becomes necessary to connect it.
Edit: It has a CD-ROM drive, as well as a floppy drive, tape drive, and apparently one USB port. 96 MB of RAM. Total capacity of C drive is 1 GB.