 The cartridge slot could also be used for hardware additions, for example speech synthesis.Some cartridges had battery-backed static random-access memory, allowing a user to save data such as game progress or scores between uses.ROM cartridges allowed the user to rapidly load and access programs and data without the expense of a floppy drive, which was an expensive peripheral during the home computer era, and without using slow, sequential, and often unreliable Compact Cassette tape.