Original sentence: By default, most Amiga computers came with chip RAM only, but could be expanded with RAM that only the CPU could access (called "Fast RAM"), through expansion boards.It featured 256-2048 KiB of "chip RAM" (depending on the model)
Edited sentence: By default, most Amiga computers were shipped with chip RAM only, but could be expanded with RAM that only the CPU could access (called "Fast RAM"), through expansion boards.It initially featured 256 KiB of "chip RAM" (later up to 2048 KiB, depending on the model)