Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
c4c:parts [14/11/2018 19:04]
andrew [Memory]
c4c:parts [14/11/2018 19:06] (current)
andrew [Memory]
Line 25: Line 25:
 The memory consists of [[c4c:​logicgates|logic gates]] arranged in a way which allows them to be written to with either a 1 or a 0, this is called a memory cell. This memory cell can be read without changing the contents as many time as is required, and when required, the contents can be changed by writing different data. \\ The memory consists of [[c4c:​logicgates|logic gates]] arranged in a way which allows them to be written to with either a 1 or a 0, this is called a memory cell. This memory cell can be read without changing the contents as many time as is required, and when required, the contents can be changed by writing different data. \\
 {{:​c4c:​magneticcorememory.jpg?​200 |}} {{:​c4c:​magneticcorememory.jpg?​200 |}}
-Early computers used a type of memory called "​Magnetic Core Memory",​ this consisted of small magnetic rings made of ferrite to store data, and two pairs of wires to read and write to the memory. Depending on whether a "​1"​ or a "​0"​ needs to be stored, the magnetism is reversed.+Early computers used a type of memory called "​Magnetic Core Memory",​ this consisted of small magnetic rings made of ferrite to store data, and two pairs of wires to read and write to the memory. Depending on whether a "​1"​ or a "​0"​ needs to be stored, the magnetism is reversed. The picture (left) shows the small rings and the wires. This was in a museum in Las Palmas, Gran Canaria which we visited. The rings are approx 1mm in diameter.
  
 More modern memory as with the CPU consists of a die (shown left, magnifyed many times) made of silicon with the millions and millions of logic gates etched on. This die is then packaged in plastic or ceramic to protect it (shown right, the die is the small rectangle in the middle), and the packaged chip is then soldered on to a printed circuit board with other memory chips. The completed assembly is called a memory module. There are many different types, the one shown on the far right is called a SODIMM, or //S//mall //O//utline //D//ual //I//n line //M//emory //M//odule. More modern memory as with the CPU consists of a die (shown left, magnifyed many times) made of silicon with the millions and millions of logic gates etched on. This die is then packaged in plastic or ceramic to protect it (shown right, the die is the small rectangle in the middle), and the packaged chip is then soldered on to a printed circuit board with other memory chips. The completed assembly is called a memory module. There are many different types, the one shown on the far right is called a SODIMM, or //S//mall //O//utline //D//ual //I//n line //M//emory //M//odule.

c4c/parts.txt ยท Last modified: 14/11/2018 19:06 by andrew