The goal of this project is to produce a minimalist Linux distribution that uses as little memory (RAM) as possible. Ubuntu 12.04 is used as a base for this new system as this supports non PAE systems /citePAE Ubuntu 12.04 is used as a base for this new system
ToriOS does not require a special setup for non-PAE hardware as Ubuntu requires” [3] PAE – Physical Address Extension is explained further on Wikipedia.
PAE allows access a physical address space larger than 4 gigabytes (232 bytes).
PAE was introduced with the Pentium Pro around 1995
https://en.wikipedia.org/wiki/Physical_Address_Extension