RAM and ROM, virtual memory, the three types of secondary storage, and common input and output devices.
Primary memory: RAM and ROM
Primary memory is directly accessed by the CPU.
| RAM | ROM | |
|---|---|---|
| Volatile? | volatile (loses contents when power off) | non-volatile (keeps contents) |
| Read/write | read and write | usually read only |
| Stores | currently running programs and data (OS, applications) | the boot-up instructions / BIOS |
| Can change? | contents change constantly | fixed at manufacture (or rarely updated) |
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