@Mauricio: I'm just now coming into the conversation and have NOT completely read the entire thread, so forgive me if I ask questions which have already been answered.
- Do you have access to a "more recent" computer which can boot from USB?
- Do you have access to a USB to IDE/SATA adapter?
- Do you have access to a USB CD and/or DVD drive?
- Take one of the memory chips out of the Pentium II machine - if there's a sticker on it, what's the ID?
(it'll usually begin with "PC" like PC100-something or just PCsomething, etc.) - There's mention of a floppy drive; do you have KNOWN TO BE GOOD floppies to use in it?
- What country do you reside in?
With a vintage machine, you run VERY GOOD chances that the optical drive is filthy just from sitting around for the past two decades and may not read anything you put inside it. The rubber belt that opens and closes the drawer is also VERY likely half-shot or worse, so DO NOT put in any CDs you cannot afford to lose and/or you must be willing to dissect the CD drive in order to get it out. That said, if you want to resurrect the machine:
To "cheat" -- if you have a newer machine which you can connect the old hard drive to that CAN boot to USB and/or CD, disconnect its hard drive and connect the OLD one and just install Tiny Core using the newer machine. You'll then be able to take the old drive, reinstall it into the P-II computer and you should be up and running, bypassing the need for CDs completely. You will then want to test the USB ports to make sure you have at least one working port (they can oxidize in decades of not being used) -- if so, should you need extensions added to your install to get the remainder of the machine up and running (networking, etc.) you now have the means to do so.
A portable USB based CD/DVD drive tends to come in handy for older machines where their own optical drives either don't exist or don't function correctly.
An IDE/SATA adapter (also USB based) allows you to plug in a hard drive from an older machine into a newer machine without fuss.