The Amiga 500 had 512KB Chip RAM by default. Typical expansions: Trapdoor expansion (A501 compatible, 512KB Slow RAM at $C00000), giving the A500 1MB. With Fat Agnus (8372) mod: 1MB Chip RAM. Zorro adapter (e.g. Microbotics Starboard) for real Fast RAM. Accelerator cards like GVP A530, Blizzard 1200 or ACA500+ offered additional 4-128MB Fast RAM. The best-selling RAM upgrade was the simple 512KB trapdoor expansion for about 50 DM.