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Hassan C

on 6 March 2013

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Transcript of RAM

Williams Tube
Magnetic Core Memory How does RAM work The History of RAM Salman & Hassan Salman & Hassan Random Access Memory
(RAM) What is RAM? A form of storage
Quick access to stored data
Data accessed randomly
Provides short term memory space
Hard drive sends data to RAM to run applications
When applications are closed,they stop using RAM, which means more room in RAM for other applications
More RAM means more applications/program
Too many applications results in RAM being used over its limit What is ROM? Read-Only-Memory
Data can't be modified
Store data that doesn't need modifications Types of RAM
. SRAM (Static Random Access Memory)
Best type
Transistors that form flip-flop circuits
1 Flip-flop circuit consist of 18 transistors DRAM (Dynamic Random Access Memory)
Made up of Capacitors
Capacitors store data
Most commonly used in computers EEPROM Electrically Erasable Programmable Read-Only Memory
user-modifiable ROM that can be erased and reprogrammed repeatedly
Can be programmed and erased in-circuit EPROM Erasable Programmable Read-Only Memory
Chip which stores data when power is shut off
Data can be erased using a strong UV light source The RAM used in our computers today
is known as Double Data Rate Synchronous
Dynamic Random-Access Memory. (DDR SDRAM)
There are few different types:
high transfer rates possible
higher speed, less power
2x rate of DDR2
30% less power First form of RAM, Williams Tube, 1947
Stored data as electrically charged spots on cathode ray tube (CRT)
Electron beam of the CRT could read and write in any order, memory was random access
Magnetic Core memory also invented in 1947
Produced until 70's
Relied on array of magnetized rings, by changing magnetization, data could be stored
Standard form of memory system until replaced by solid-state memory THANK YOU Future of RAM I believe that in the future RAM will be much smaller, and will work at a much faster pace than it does today. Allowing applications that require a good ram to run smoothly.
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