, specifically version 2.10. These discs were originally used to configure the PS2 Network Adapter so users could play multiplayer games.
While physical copies are available at retailers like eBay and Ralphie's Funhouse for around $1 to $16, many users seek the ISO file to boot the software on modern hardware via emulation or homebrew. Disc Overview and Purpose
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