TYPES OF MEMORY

RAM – Random Access Memory (Volatile).

ROM – Read Only Memory (Non-Volatile).

RAM can be classified into 2 types

1. SRAM – Static RAM – Expensive, used mostly in cache memory.
2. DRAM – Dynamic RAM

SRAM types

1. ASYNC  SRAM
2. SYNC SRAM
3. Pipeline Burst RAM

DRAM types

1. FPM DRAM – Fast Page Mode DRAM ---- Very slow, Access time – 120 ns (Access time: Time taken to retrieve data from memory).
2. EDO DRAM – Extended Data Out DRAM ----- Able to retrieve more than 1 data at the same time Faster than FPM DRAM.
3. BEDO DRAM – Burst EDO DRAM
4. SDRAM  - Synchronous DRAM
5. DDR SDRAM – Double Data Rate SDRAM

Other types of memory

1. Cache Memory i) L2 cache – Faster than RAM, 20 to 30 ns. ii) Faster than L2 & RAM, 10 ns. Inbuilt in CPU & smaller in size.
2. Conventional or Base memory – 640 KB size.
3. Extended Memory (XMS) -
4. Expanded Memory (EMS)

RAM Error Messages when corrupted

• General protection error
• Program performed an illegal operation

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