Memory and storage (Jeric Bilita)

Memory and Storage

Prepared by: Jeric F. Bilita

What is memory?

-consist of electronic components that store instructions waiting to be executed by the processor, data needed by those instructions and the results of processed data.

What are items memory holds?

The Operating system

Application Programs

Data processed by Application Program and the resulting information

Stored Program Concept

-the role of memory as a part of computer storing both data and programs

-refers to the basic storage unit in memory.

-resides temporarily in a location in memory that has an address.

Bytes (character)

Types of Memory

-loses its contents when computer’s power is off. -temporary. Ex. ROM

-don’t loose content even if computer’s power is off. -permanent

Ex. RAM

Volatile Nonvolatile

Ready for RFID?

RFID (Radio Frequency Identification) - it uses a tiny computer chip that is mounted

to a product.

RFID reader -reads identifying information on the memory

chip via radio waves .

-must be re-energized constantly or they lose their contents.

Types of RAM (Random Access Memory)

Dynamic RAM Static RAM

-no need to be re-energized. -faster and more reliable. -more expensive than any variation of DRAM

MEMORY MODULE

-a small circuit board where RAM resides.-located on the memory slots on the mother board

SIMM(single inline memory module)DIMM(dual inline memory module)RIMM(rambus inline memory)

Types of Memory Module

Check your computer documentation to see how much RAM you can add.

Can I add more RAM in my computer?

Cache (pronounced cash)

-improve computer’s processing time.

Two Types of Cache

a. Memory cache b. Disk cache

Types Of Memory CacheL1 Cache- built directly in the processor -has small capacity like in PC.L2 Cache-slower than L1 -has larger capacity than L1L3 Cache-a cache on the motherboard that is separate from the processor.

-it coexist with L2.

-helps speed the processes of the computer because it stores frequently used instructions and data.

Memory cache

ROM(Read Only Memory)

-data stored cannot be modified, hence the name read-only.

-a memory chip storing permanent items.

PROM(programmable read-only memory)

-nonvolatile

-is a blank ROM chip on which a programmer can write permanently using microcode but erasable by EEPROM.

Flash Memory

-nonvolatile -can be erased electronically and

rewritten -also store data/instruction.

CMOS (pronounced See-moss)

-stands for Complementary Metal-oxide semiconductor

-provides high speeds and consumes less power.

-uses battery to retain information.

Memory Access Time

-is the amount of time it takes to read from memory.

10,000,000 operations= 1blink

Teenk u! ….