A604 Memory Expansion for the Amiga 600 Features Expand your A600 to 2MB chip memory Real-time clock with optional coin battery Dual 22-pin clockport header for adding selected clockport expansions to your A600 Expansion port for the new Indivision ECS scandoubler/flickerfixer Fits into trapdoor (under side of Amiga 600). Printed instructions included. 2 year warranty The second clockport is designed for use with the Subway USB controller (available separately). The Subway can be mounted at the same time as an optional Indivision ECS as shown in the picture below: