12540526
Description
Mind Map by eleanor croker, updated more than 1 year ago
|
Created by eleanor croker
almost 7 years ago
|
|
1.2 - Memory
- RAM
- Random Access Memory
- There are lots of different
RAMs:
- DRAM (Dynamic
Random-Access Memory)
- SDRAM (Synchronous Dynamic
Random-Access Memory)
- FPM RAM
- EDO RAM
- DDR (SD)RAM (Double Data
Rate (Synchronous Dynamic)
Random-Access Memory)
- DRAM (Dynamic
Random-Access Memory)
- RAM is used to store the instructions
that are used by the CPU
- RAM is known as volatile memory,
which means it forgets everything as
soon as the power is switched off
- The computer can not work without RAM because the operating
system and programs need RAM to work, and the lack of RAM would
be detected by the BIOS and the computer would fail the POST.
- Random Access Memory
- ROM
- Read-Only Memory
- ROM is non-volatile, which means
it remembers its data, even after
the power is switched off
- ROM Chips
- They store the BIOS
on a computer.
- BIOS stands for Basic Input Output
System. This tells the computer what
it should do when it is first turned on.
- BIOS also lets you change the boot order for the PC.
When it is first powered up the BIOS does a POST
- POST stands for
Power-On Self Test.
- When the computer boots up, it checks
all the components attached to it to
check none of them have a fault If the
POST fails, the motherboard beeps.
- When the computer boots up, it checks
all the components attached to it to
check none of them have a fault If the
POST fails, the motherboard beeps.
- POST stands for
Power-On Self Test.
- BIOS stands for Basic Input Output
System. This tells the computer what
it should do when it is first turned on.
- You can’t save to ROM chips
- They store the BIOS
on a computer.
- Read-Only Memory
- Virtual Memory
- Virtual memory is a portion of the hard drive that is used as an “overflow” for when there is too much data for the RAM to hold at once
Virtual memory is significantly slower than RAM because it is on the hard drive, which takes much longer for the CPU to access Adding more
RAM speeds up your computer because it means more instructions can be stored in the RAM, making them quicker to fetch and execute. In
order to access something in the virtual memory, it has to be moved into the RAM, which means moving something else out, then moving it in
then running it. You can tell how much virtual memory is currently in use (on Windows) by using: Resource Monitor The Resource Monitor will
tell you exactly how much RAM is being used, what is using it, and allow you to sort the list of apps using it by several different categories.
However, it doesn’t offer much else. You can reduce the computer’s need to use virtual memory by getting bigger RAM. A flash drive can be
used to support the RAM.
- Virtual memory is a portion of the hard drive that is used as an “overflow” for when there is too much data for the RAM to hold at once
Virtual memory is significantly slower than RAM because it is on the hard drive, which takes much longer for the CPU to access Adding more
RAM speeds up your computer because it means more instructions can be stored in the RAM, making them quicker to fetch and execute. In
order to access something in the virtual memory, it has to be moved into the RAM, which means moving something else out, then moving it in
then running it. You can tell how much virtual memory is currently in use (on Windows) by using: Resource Monitor The Resource Monitor will
tell you exactly how much RAM is being used, what is using it, and allow you to sort the list of apps using it by several different categories.
However, it doesn’t offer much else. You can reduce the computer’s need to use virtual memory by getting bigger RAM. A flash drive can be
used to support the RAM.
- Flash Memory
- You can run some programs from
flash memory, but since it is
attached to the Operating System, it
will only be runnable on that device.
- Flash memory is a form of
non-volatile storage.
- Flash memory is very cheap and is
found in many forms, including:
USB sticks SD cards Micro SD cards
- Flash memory stores
data on small chips
- Each bit of data is stored in a
tiny circuit (the memory cell)
consisting of transistors.
- You can run some programs from
flash memory, but since it is
attached to the Operating System, it
will only be runnable on that device.
Want to create your own Mind Maps for free with GoConqr? Learn more.