I recently developed a popular board called RAMesses, which upgrades an Amiga 500 / 2000 / Commodore CDTV to 2MB of Chip RAM without any soldering" : r/ amiga
RAMesses II Amiga 2MB Chip RAM upgrade from Retro Supplies on Tindie
GitHub - blark/a500plus-chipram-expansion: A 1MB chip RAM expansion for the A500+