My OperaA+ Exam Cram 2 Memory
Sunday, April 8, 2012 5:15:17 AM
Memory is just a temporary location to retailer information and facts until the CPU can get to it. This information can be plan instructions, data, or both. A typical instruction could be a request to store a number or an event somewhere. A further may well be to retrieve that information and facts from a specific placean address. Volatile memory can only hold data when a usual electrical current is present. Nonvolatile memory can hold specifics without any electrical present.
CAUTION
Volatile, from the Latin "to fly," means that data "flies away" when there's no electricity to help keep it in location. Tv reporters usually refer to an explosive circumstance as a volatile scenario, which means that it could adjust at any second. Nonvolatile memory, because it isn't volatile, stays the exact same without having any will need for electricity.
Conceptual Overview
Memory is fairly simple to know, when you've grasped the fundamental ideas. Within a nutshell, a CPU moves bits of information into registers (storage locations inside a chip). Immediately after it is dealt with these information bits to its satisfaction, the CPU functions together with a memory controller to move the results out to memory cells (storage locations on a memory chip). Each registers and memory cells have memory addresses, and every time a bit of data goes someplace, it crosses a bus of some type. That's it! Now go pass the exam.
All perfect, so it's a bit, so to speak, a great deal more complex than that. Most memory began as dynamic random access memory (DRAM), as well as the most important modifications happen to be to either speed up the memory to match the CPU, or to speed up the CPU to match the memory. For one of the most portion, the history of memory development revolves around synchronizing these two subsystems.
NOTE
When we refer to speeding up memory, this often means increasing either the actual speed in the chips or rising the clock speed of associated buses.
Memory entails a variety of simple concepts, the very first of which can be a grid or matrix. Due to this, we're going to place Table 3.1 to a slightly numerous use, creating it a kind of "mind map." When you can see the way the general ideas break down on a grid, then possibly they'll be less difficult to don't forget.
NOTE
A matrix is absolutely nothing way more than an arrangement of columns and rows, like a spreadsheet or an Etch-a-Sketch. Columns go across the page, and rows go down the side. Cells going left to right (horizontally) have an X coordinate. Cells going up and down (vertically) possess a Y coordinate. The direction of rows or columns is known as the axis. Combining each the X and Y coordinates gives us an address within the grid, like a cell address within a spreadsheet.
Table 3.1 Mind map of basic memory ideas.
Information Storage C Nonvolatile
Disks Temporary swap files
ROM C Nonvolatile BIOS
Programmable ROM CMOS C volatile (trickle charge)
Flash BIOS C Nonvolatile
RAM C Volatile
Varieties of RAM
Forms of Packaging
Key Memory
DRAM
DIP
SRAM
SIMM
SDRAM
DIMM
RDRAM
RIMM
VRAM
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CAUTION
Volatile, from the Latin "to fly," means that data "flies away" when there's no electricity to help keep it in location. Tv reporters usually refer to an explosive circumstance as a volatile scenario, which means that it could adjust at any second. Nonvolatile memory, because it isn't volatile, stays the exact same without having any will need for electricity.
Conceptual Overview
Memory is fairly simple to know, when you've grasped the fundamental ideas. Within a nutshell, a CPU moves bits of information into registers (storage locations inside a chip). Immediately after it is dealt with these information bits to its satisfaction, the CPU functions together with a memory controller to move the results out to memory cells (storage locations on a memory chip). Each registers and memory cells have memory addresses, and every time a bit of data goes someplace, it crosses a bus of some type. That's it! Now go pass the exam.
All perfect, so it's a bit, so to speak, a great deal more complex than that. Most memory began as dynamic random access memory (DRAM), as well as the most important modifications happen to be to either speed up the memory to match the CPU, or to speed up the CPU to match the memory. For one of the most portion, the history of memory development revolves around synchronizing these two subsystems.
NOTE
When we refer to speeding up memory, this often means increasing either the actual speed in the chips or rising the clock speed of associated buses.
Memory entails a variety of simple concepts, the very first of which can be a grid or matrix. Due to this, we're going to place Table 3.1 to a slightly numerous use, creating it a kind of "mind map." When you can see the way the general ideas break down on a grid, then possibly they'll be less difficult to don't forget.
NOTE
A matrix is absolutely nothing way more than an arrangement of columns and rows, like a spreadsheet or an Etch-a-Sketch. Columns go across the page, and rows go down the side. Cells going left to right (horizontally) have an X coordinate. Cells going up and down (vertically) possess a Y coordinate. The direction of rows or columns is known as the axis. Combining each the X and Y coordinates gives us an address within the grid, like a cell address within a spreadsheet.
Table 3.1 Mind map of basic memory ideas.
Information Storage C Nonvolatile
Disks Temporary swap files
ROM C Nonvolatile BIOS
Programmable ROM CMOS C volatile (trickle charge)
Flash BIOS C Nonvolatile
RAM C Volatile
Varieties of RAM
Forms of Packaging
Key Memory
DRAM
DIP
SRAM
SIMM
SDRAM
DIMM
RDRAM
RIMM
VRAM
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