1.2.4 RDRAM (N64 Main Memory)

RDRAM is the N64 main memory. It provides a total of 4 megabytes by 9 bits of memory in two chips of 2 megabytes each. You can add another 4 megabytes of RDRAM (another two chips of two megabytes each) by connecting the Memory Pak, which is used by the N64 Game Pak. The CPU and the RCP processing chips share all available RDRAM as shown in the following illustration:


Features of RDRAM

RDRAM Block Definition

As a game developer, you can map RDRAM as appropriate for each game application. Usually the following buffers and areas are specified in RDRAM: