It 11 prt 2

• Types of computer memory

  1. Cache memory
  2. RAM
  3. Dynamic RAM
  4. Static RAM
  5. Double Data Rate SDRAM
  6. Double Data Rate 4 Synchronous Dynamic RAM
  7. Rambus Dynamic RAM
  8. Read-only memory
  9. Programmable ROM
  10. Erasable PROM
  11. Electrically Erasable PROM
  12. Virtual memory
• Cache memory

  is more readily available to the processor than the computer's main memory source
• Cache memory It is also called CPU memory because it is typically integrated directly into the CPU chip or placed on a separate chip with a bus interconnect with the CPU.
• RAM . The term is based on the fact that any storage location can be accessed directly by the processor.
• Dynamic RAM .is a type of semiconductor memory that is typically used
• Static RAM

  retains data bits in its memory for as long as power is supplied to it.
• DRAM , which stores bits in cells consisting of a capacitor and a transistor, SRAM does not have to be periodically refreshed.​
• Double Data Rate SDRAM

  is SDRAM that can theoretically improve memory clock speed to at least 200 MHz.
• Double Data Rate 4 Synchronous Dynamic RAM

  •is a type of DRAM that has a high-bandwidth interface and is the successor to its previous DDR2 and DDR3 versions.
• DDR4 RAM allows for lower voltage requirements and higher module density. It is coupled with higher data rate transfer speeds and allows for dual in-line memory modules (DIMMS) up to 64GB.
• Rambus Dynamic RAM

  is a memory subsystem that promised to transfer up to 1.6 billion bytes per second.
• Read-only ​memory( ROM )

  is a type of computer storage containing nonvolatile, permanent data that, normally, can only be read and not written to.​
• ROM contains the programming that enables a computer to start up or regenerate each time it is turned on.​
• Programmable ROM (PROM)

  is ROM that can be modified once by a user.
• PROM .

  Its a user to tailor a microcode program using a special machine called a PROM programmer.
• Erasable PROM (EPROM)

  • is programmable read-only memory PROM that can be erased and reused
• Erasure is caused by shining an intense ultraviolet light through a window designed into the memory chip.
• Electrically Erasable PROM (EPROM)

  • is a user-modifiable ROM that can be erased and reprogrammed repeatedly through the application of higher than normal electrical voltage.
• Virtual memory uses hardware and software to enable a computer to compensate for physical memory shortages by temporarily transferring data from RAM to disk storage.
• Virtual memory - A memory management technique where secondary memory can be used as if it were a part of the main memory.