1.2 Memory

1.2 Memory

ROM
1. Read only memory, ROM is non volatile so when you turn off your computer/device it'll save everything in ROM
2. ROM is the thing that keep you computer running if you had no ROM your monitor wont proccess any words because its there to read only what its set to do
  1. It doesn't lose data when your device is turned off
  2. Once data has been written onto a ROM chip, it cannot be removed and can only be read
  3. Read only memory
Cache
1. To store data locally in order to speed up subsequent retrievals. Pronounced cash. See Web cache and browser cache.
  1. GHz
  2. MHz
  3. The cpu is made of cache, cores and clock speed
2. Reserved areas of memory in every computer that are used to speed up instruction execution, data retrieval and data updating.
3. Cache memory, also called CPU memory, is random access memory RAM that a computer microprocessor can access more quickly than it can access regular RAM
RAM
1. RAM (pronounced ramm) is an acronym for random access memory
  1. a type of computer memory that can be accessed randomly
    1. that is, any byte of memory can be accessed without touching the preceding bytes.
      1. Random access memory (RAM) is a type of data storage used in computers that is generally located on the motherboard.
        This type of memory is volatile and all information that was stored in RAM is lost when the computer is turned off
  2. Random access memory
Flash Memory
1. a kind of memory that retains data in the absence of a power supply
2. for transfering data between a personal computer PC and digital device.
  1. Flash memory is a non-volatile memory chip used for storage
    1. Flash memory is a non-volatile memory chip used for storage and for transfering data between a personal computer
    2. Flash memory is a type of electrically erasable programmable read-only memory
Solid State
1. This is no moving parts and it used flash memory
  1. Because it has no moving parts its hard to hack
    1. solid states are faster than hard disk because there is zero latency
    2. An all-electronic storage device that is an alternative to a hard disk
Virtual memory
1. Virtual memory is needed to let more memory in then there is available in the system
2. it is temporary memory
3. it is located on the hard drive
  1. Virtual memory is an area of secondary storage that is used like RAM
    1. rapidly exchanging data in memory for data on disk, to the exclusion of most application-level processing
  2. Disk thrashing: In computer science, thrashing occurs when a computer's virtual memory subsystem is in a constant state of paging
4. When the hard drive is full you can no-longer do things such as copy and paste
Registers
1. A processor register CPU register is one of a small set of data holding places that are part of the computer processor
  1. A register may hold an instruction, a storage address, or any kind of data
2. The storage time of internal registers is extremely temporary, as they often hold data for less than a millisecond

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	Criado por Michael Jackson quase 7 anos atrás