RAM pack


RAM pack, RAMpack, RAM expansion cartridge, RAM expansion unit , memory expansion pak and memory module are some of the most common names given to various self-contained units or cartridges that expand a computer, games console or other device's own internal RAM in a user-friendly manner.
Such units are generally designed to be installable by an end-user with little technical knowledge, often simply by plugging them into an expansion or cartridge slot easily accessible at the rear of the machine, or via a user-accessible hatch.
The ZX81 16K RAM expansion gained particular notoriety for the "RAM pack wobble" problem because it was top-heavy and only supported by the edge connector. This could lead to it falling out, crashing the ZX81 and losing any program or data currently in the computer's memory.
Examples of such memory expansions include: