1335464
Description
Mind Map by Eloise Milward, updated more than 1 year ago
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Created by Eloise Milward
about 10 years ago
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RAM and ROM
- ROM
- The letters stand for
'read only memory'
- When the computer is turned off, the
ROM keeps all its data and memory.
For example, date and clock.
- The letters stand for
'read only memory'
- RAM
- The letters stand for
'random access memory
- The RAM clears itself every
time the computer is turned off
- Dynamic RAM
- Dynamic RAM is the
most common
memory in use today
- It takes up more room on a chip
- Each memory cell holds one bit of
information and is made up of two parts: a
transistor and a capacitor. These are, of
course, extremely small transistors and
capacitors so that millions of them can fit
on a single memory chip.
- It takes up more room on a chip
- Dynamic RAM is the
most common
memory in use today
- Static RAM
- Static RAM uses a completely different
technology. In static RAM, a form of flip-flop
holds each bit of memory. A flip-flop for a
memory cell takes 4 or 6 transistors along with
some wiring, but never has to be refreshed.
- This makes static RAM significantly faster than
dynamic RAM. However, because it has more
parts, a static memory cell takes a lot more
space on a chip than a dynamic memory cell.
- Therefore you get less memory
per chip, and that makes static
RAM a lot more expensive.
- Therefore you get less memory
per chip, and that makes static
RAM a lot more expensive.
- This makes static RAM significantly faster than
dynamic RAM. However, because it has more
parts, a static memory cell takes a lot more
space on a chip than a dynamic memory cell.
- Static RAM uses a completely different
technology. In static RAM, a form of flip-flop
holds each bit of memory. A flip-flop for a
memory cell takes 4 or 6 transistors along with
some wiring, but never has to be refreshed.
- The letters stand for
'random access memory
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