Nintendo 64 - Expansion Pak - Boxed

The Expansion Pak for Nintendo 64 allows the Random Access Memory (RAM) of the Nintendo 64 console to increase from four megabytes (MB) to eight MB of contiguous main memory. With the help of an included key, the Expansion Pak fits into the slot below a removable panel on the top of the N64 console. Game developers can take advantage of the increased memory in several ways, including making games that are more visually appealing. Some games will allow players to choose a "high resolution" option, increasing the screen resolution from 320 by 240 pixels to as much as 640 by 480 pixels, creating crisp, high-definition graphics. The Expansion Pak utilises Nintendo 64's capability for 32-bit, 16.7-million-colour display with 256 levels of transparency (alpha), bringing your games to a new level of realism. Instead of re-using texture data, games can buffer a larger number of textures for a more distinct look.

Other ways for developers to utilise the larger memory is by setting a higher frame rate, longer replays and more animation. Games can also have more sophisticated artificial intelligence, allowing computer-controlled characters literally to be smarter. Games can offer more characters and vehicles, and can contain larger, more complex levels and worlds. Some games like Legend of Zelda: Majora's Mask require the Expansion Pak, while others such as Perfect Dark require it for access to all of the game's levels and features.