Memory is the part of the computer on which data can be stored. As you put on the computer, it reads the main memory or RAM (Random Access Memory) of the computer. Then it seeks system files of Operating System (OS) to load in the RAM. This memory is eraseable. As the electricity goes off or you shut down the computer, everything in the RAM will be erased.There is another type of memory in the computer which is called the ROM Read Only Memory). The program written in ROM cannot be altered or it is not eraseable or it cannot be changed.
PRIMARY AND SECONDARY MEMORY
1. Primary Memory-RAM(Random Access Memory)
Any information store in RAM will be lost after power goes off so that it is temporary memory. The most common RAM in markets are-512 MB DDR2 or DDR3 1 GB (DDR2 RAM 667 Mhz, 800Mhz) or DDR3 2 GB DDR2 or DDR3 4 GB DDR2 or DDR3
ROM (Read Only Memory) The information of ROM is already stored during manufacturing time and it is attached to the main board. 4 types of ROM are;• Masked ROM (Masked Read Only Memory)• PROM (Programmable Read Only Memory)• EPROM (Erasable Programmable Read Only Memory)• EEPROM (Electrically Erasable Programmable Read Only Memory)
2. Secondary Memory: Hard Disk, Pen Drives, CD, DVD, Floppy Disk
The unit memory of the computer is called the bit. One bit is equal to 0 or 1. Below table will be helpful for you to know its multiples.
0 = 1 bit1 = 1 bit4 bits = 1 nibble8 bits = 1 byte1024 bytes= 1 Kilobyte (Kb)1024 Kilobytes = 1 Mega byte (Mb) 1024 Megabytes= 1 Gigabyte (Gb)1024 Gigabyte =1 Terabyte (Tb)
Different types of memory.
SIMMs (single in-line memory modules) -have 72 pins. -it can use either FPM (fast page mode) or EDO (extended data output) technology.-A SIMM measures 4 1/2 inches long and consists of 72 pins along the bottom of the module (36 on each side). -FPM and EDO speeds are often presented in nanoseconds. -The lower the number, the faster the RAM.
DIMMs (dual in-line memory modules)- have either 168 pins or 184 pins.- Has one notches cut out along the pins
RIMMs (Rambus dynamic RAM) - have 184 pins.It has two notches cut out along the pins.
PRIMARY AND SECONDARY MEMORY
1. Primary Memory-RAM(Random Access Memory)
Any information store in RAM will be lost after power goes off so that it is temporary memory. The most common RAM in markets are-512 MB DDR2 or DDR3 1 GB (DDR2 RAM 667 Mhz, 800Mhz) or DDR3 2 GB DDR2 or DDR3 4 GB DDR2 or DDR3
ROM (Read Only Memory) The information of ROM is already stored during manufacturing time and it is attached to the main board. 4 types of ROM are;• Masked ROM (Masked Read Only Memory)• PROM (Programmable Read Only Memory)• EPROM (Erasable Programmable Read Only Memory)• EEPROM (Electrically Erasable Programmable Read Only Memory)
2. Secondary Memory: Hard Disk, Pen Drives, CD, DVD, Floppy Disk
The unit memory of the computer is called the bit. One bit is equal to 0 or 1. Below table will be helpful for you to know its multiples.
0 = 1 bit1 = 1 bit4 bits = 1 nibble8 bits = 1 byte1024 bytes= 1 Kilobyte (Kb)1024 Kilobytes = 1 Mega byte (Mb) 1024 Megabytes= 1 Gigabyte (Gb)1024 Gigabyte =1 Terabyte (Tb)
Different types of memory.
SIMMs (single in-line memory modules) -have 72 pins. -it can use either FPM (fast page mode) or EDO (extended data output) technology.-A SIMM measures 4 1/2 inches long and consists of 72 pins along the bottom of the module (36 on each side). -FPM and EDO speeds are often presented in nanoseconds. -The lower the number, the faster the RAM.
DIMMs (dual in-line memory modules)- have either 168 pins or 184 pins.- Has one notches cut out along the pins
RIMMs (Rambus dynamic RAM) - have 184 pins.It has two notches cut out along the pins.
