Key features of the v18 BIOS:
Clean dump. SCPH-90001, BIOS v18, NA region. Custom bridge method, full sector-by-sector verification. First known clean extraction. Hashes below. Someone else verify before I mirrors it. Scph-90001-bios-v18-usa-230.rom0
The v18 BIOS introduced an enhanced LibCrypt check. Earlier PS1s could be tricked via a wobbling CD subchannel. The v18 BIOS actually compares the subchannel data table against a hidden signature in the lead-in area of official discs. Key features of the v18 BIOS: Clean dump
This is the most crucial aspect of this BIOS. Sony updated the boot ROM on these machines (roughly Q3 2009 onwards) to specifically break compatibility with Free McBoot (FMCB) , the popular softmod that allows homebrew software. NA region. Custom bridge method
