Know and understand characteristics of ROM and RAM

1. Types and Components of Computer Systems

1.1 ROM – Read‑Only Memory

ROM is like a cookbook that contains recipes (data) that you can read but not change while the computer is running. It stores the firmware that tells the computer how to start up (BIOS, UEFI). Because it is non‑volatile, the information remains even when the power is off.

• Non‑volatile – keeps data without power.
• Permanent storage – data is written during manufacturing or by special programming.
• Typical uses: BIOS/UEFI, device drivers, embedded systems.
• Types of ROM:
  1. PROM – Programmable once.
  2. EPROM – Erasable by UV light.
  3. EEPROM – Electrically erasable.
  4. Flash – Fast, large capacity, widely used in SSDs and USB sticks.

1.2 RAM – Random‑Access Memory

RAM is like a whiteboard where you write notes while studying. You can read and write data quickly, but once you turn off the computer, everything on the whiteboard disappears. RAM is essential for the computer to run programs efficiently.

• Volatile – loses data when power is removed.
• Fast read/write speeds.
• Used to store the operating system, applications, and data currently in use.
• Types of RAM:
  1. DRAM – Dynamic RAM, needs refreshing.
  2. SRAM – Static RAM, faster, used in CPU caches.
  3. SDRAM – Synchronous DRAM, works with the system clock.

1.3 Key Differences Between ROM and RAM

1.4 Quick Quiz

1. Which memory type retains data after the computer is turned off? Answer: ROM
2. What is a common analogy for RAM? Answer: A whiteboard
3. Name one type of ROM that can be erased and rewritten. Answer: EEPROM or Flash
4. Why is RAM considered volatile? Answer: It loses data when power is removed.

?? Great job! Remember: ROM is the permanent cookbook, RAM is the temporary whiteboard. Keep these analogies in mind when you study how computers remember and process information. 🚀