The Online Start-Up Disc was an essential utility for both original "Fat" PS2 models and "Slimline" models.
Because official Sony PS2 servers were discontinued in 2012, the disc is largely used for hobbyist and legacy purposes. PSBBN-Definitive-Project/README.md at main - GitHub Download SLUS 210 ONLINESTARTUPDISC ISO
, specifically version 2.10. These discs were originally used to configure the PS2 Network Adapter so users could play multiplayer games. The Online Start-Up Disc was an essential utility
: Its primary function was to create a network configuration file (netcnf) saved to a memory card. This file contained ISP settings required for the console to connect to the internet. Download SLUS 210 ONLINESTARTUPDISC ISO