My OperaA+ Exam Cram 2 Memory
Sunday, April 8, 2012 3:51:12 AM
This sample chapter explains the ins and outs of all kinds of memory to assist you prepare for the A+ exam.
Terms you will have to know:
Memory controller
Read-only memory (ROM) and erasable programmable ROM (EPROM)
Capacitor
Bus
RAM, DRAM, SRAM, SDRAM, VRAM, RDRAM
DIP, SIMM, DIMM, RIMM
Ideas you'll really need to master:
Volatile versus nonvolatile memory
Megahertz (MHz) and nanoseconds (ns.)
Memory address
Synchronization to clock cycle (clock tick)
Memory module versus memory chip
Odd and also parity checking
Computers use numerous numerous microchips and processors, with perhaps essentially the most familiar becoming the CPU and the primary memorywhat men and women commonly refer to as the computer's RAM. Memory is just a temporary place to shop knowledge until the CPU can get to it. This knowledge can be system instructions, information, or both. A typical instruction might be a request to store a number or an event somewhere. One more might possibly be to retrieve that info from a particular placean address. Volatile memory can only hold data when a typical electrical existing is present. Nonvolatile memory can hold knowledge without having any electrical present.
CAUTION
Volatile, from the Latin "to fly," means that info "flies away" when there is no electricity to help keep it in location. Television reporters often refer to an explosive situation as a volatile situation, meaning that it could transform at any second. Nonvolatile memory, given that it is not volatile, stays the identical devoid of any have to have for electricity.
Conceptual Overview
Memory is fairly easy to understand, when you've grasped the fundamental ideas. Inside a nutshell, a CPU moves bits of data into registers (storage areas inside a chip). Right after it's dealt with these information bits to its satisfaction, the CPU works together having a memory controller to move the results out to memory cells (storage places on a memory chip). Each registers and memory cells have memory addresses, and each time a bit of information goes someplace, it crosses a bus of some type. That is it! Now go pass the exam.
All proper, so it really is a bit, so to speak, additional complicated than that. Most memory began as dynamic random access memory (DRAM), and the most important modifications have been 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 component, the history of memory development revolves about synchronizing these two subsystems.
NOTE
When we refer to speeding up memory, this in most cases signifies rising either the actual speed of the chips or increasing the clock speed of connected buses.
Memory entails a few fundamental ideas, the very first of which can be a grid or matrix. Due to this, we're going to place Table three.1 to a slightly different use, producing it a sort of "mind map." In case you can see the way the overall concepts break down on a grid, then maybe they'll be easier to remember.
NOTE
A matrix is absolutely nothing a lot 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. microsoft mcse, a exams, mcitp enterprise administrator
Terms you will have to know:
Memory controller
Read-only memory (ROM) and erasable programmable ROM (EPROM)
Capacitor
Bus
RAM, DRAM, SRAM, SDRAM, VRAM, RDRAM
DIP, SIMM, DIMM, RIMM
Ideas you'll really need to master:
Volatile versus nonvolatile memory
Megahertz (MHz) and nanoseconds (ns.)
Memory address
Synchronization to clock cycle (clock tick)
Memory module versus memory chip
Odd and also parity checking
Computers use numerous numerous microchips and processors, with perhaps essentially the most familiar becoming the CPU and the primary memorywhat men and women commonly refer to as the computer's RAM. Memory is just a temporary place to shop knowledge until the CPU can get to it. This knowledge can be system instructions, information, or both. A typical instruction might be a request to store a number or an event somewhere. One more might possibly be to retrieve that info from a particular placean address. Volatile memory can only hold data when a typical electrical existing is present. Nonvolatile memory can hold knowledge without having any electrical present.
CAUTION
Volatile, from the Latin "to fly," means that info "flies away" when there is no electricity to help keep it in location. Television reporters often refer to an explosive situation as a volatile situation, meaning that it could transform at any second. Nonvolatile memory, given that it is not volatile, stays the identical devoid of any have to have for electricity.
Conceptual Overview
Memory is fairly easy to understand, when you've grasped the fundamental ideas. Inside a nutshell, a CPU moves bits of data into registers (storage areas inside a chip). Right after it's dealt with these information bits to its satisfaction, the CPU works together having a memory controller to move the results out to memory cells (storage places on a memory chip). Each registers and memory cells have memory addresses, and each time a bit of information goes someplace, it crosses a bus of some type. That is it! Now go pass the exam.
All proper, so it really is a bit, so to speak, additional complicated than that. Most memory began as dynamic random access memory (DRAM), and the most important modifications have been 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 component, the history of memory development revolves about synchronizing these two subsystems.
NOTE
When we refer to speeding up memory, this in most cases signifies rising either the actual speed of the chips or increasing the clock speed of connected buses.
Memory entails a few fundamental ideas, the very first of which can be a grid or matrix. Due to this, we're going to place Table three.1 to a slightly different use, producing it a sort of "mind map." In case you can see the way the overall concepts break down on a grid, then maybe they'll be easier to remember.
NOTE
A matrix is absolutely nothing a lot 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. microsoft mcse, a exams, mcitp enterprise administrator
