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ROM is a type of memory that can only be read from and cannot be modified. It is non-volatile, meaning its contents are retained even when power is turned off. PROM, EPROM, and EEPROM are programmable versions of ROM that can be written to a single time (PROM), by exposing it to UV light (EPROM), or electrically (EEPROM). RAM is volatile memory that is used by the CPU for temporary storage and can be written and read many times. Caches like L1, L2, L3 improve memory access speed. Different RAM types include DRAM, SRAM, VRAM, and EDO RAM.


















































