Yamaha 02R Owner's Manual page 284

174 Installing Options
Digital Recording Console 02R User's Guide
Memory Expansion Kit
The memory expansion kit (ME4M) expands the 02R automation system
memory from the standard 512 Kbytes to either 1.5 Mbytes or 2.5 Mbytes.
Note: You cannot install the Memory Expansion Kit ME4M without
invalidating the warranty. Take your 02R to your YAMAHA dealer or authorized
service centre for installation of the ME4M kit.
Wooden Side Panels
These Wooden Side Panels (W02SP) attach to either side of the 02R to give
it an attractive appearance.