COMPUTER MEMORY
Computer memory is a generic term of for all the
different types of data storage , technology that a computer may include RAM
and ROM and flash memory .
MEMORY
1.
PRIMARY
MEMORY
2.
SECONDARY
MEMORY
·
PRIMARY MEMORY –
these memory include ROM , and RAM and is located closed to the CPU on
the computer motherboard enabling the CPU to read data from primary memory
very quickly indeed .It is used to store data that the CPU needs imminently so
that it does not have to wait for it to be delievered .
·
SECONDARY MEMORY - these memory refers to storage devices such
as hard drives and solid state drive and solid state drives .It
may also refer to removable storage media such as USB CABLE FLASH drives ,CD’S
and DVD’S . Unlike primary memory , secondary memory is not accessed
directly by the CPU.
Ø
TYPES OF PRIMARY MEMORY
ROM AND RAM
RAM - RAM stands for random access memory which temporality
stores data while the central processing unit ( CPU ) is executing other tasks .
ROM –
ROM stands for read only memory .It is non - volatile which retains data even
without power .It is used mainly to start or boot up a computer .
TYPES OF RAM
( DRAM )
is widely used as computer’s main memory .Each DRAM memory cell us made up of a
transistor and a capacitor with a integrated and a data bit is stored in the capacitor .
( SRAM ) is
made up of four to six transistors as long as power is supplied to the systems
unlike DRAM which has to be refreshed periodically .
TYPES OF ROM
( PROM )
is essential a blank version of ROM .A
blank PROM chip allows current to run through all possible pathways .
( EPROM ) is
a type of programmable read only memory chip that retain its data when it power
supply is switched off .Computer memory that can retrieve stored data after a
power supply has been turned off and back on is called non volatile .
( EEPROM ) stand
for electricity erasable programmable rom is a type of non - volatile memory
used in computers .Integrated in micro controllers for smart card and remote keyless
systems and other electron in devices to store relatively small amount of data but allowing individual bytes to be erased
and reprogrammed
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