Main Memory (RAM, ROM and Cache)

Explaining Random Access Memory (RAM), Read Only Memory (ROM) and cache.

Made primarily for OCR GCSE Computer Science (J277) Paper 1.

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[itsshreyshrey]

anyone one else trying to cover the whole paper 1 syllabus in ONE DAY?!? GOOD LUCK FOR TOMORROW EVERYONE

[jackwalker]

computer studies test tomorrow, found a way to procrastinate by looking through comments

[chronicsnail]

Volatile - Memory which is lost once power is lost e.g. RAM, Cache, Registers
Non-volatile - Memory which is not lost once power is lost. e.g. HDD, ROM

RAM: Random Access Memory. This is large amounts off data being stored as the data being stored is most likely in use or about to be. Because of this RAM is large, contains GB of memory. This is where the registers fetch the location of data then once the address is specified the CPU can execute the data. RAM to CACHE to REGISTERS from the REGISTERS the data is executed. RAM is volatile. Your RAM can be viewed if you search for "Task Manager" on a Windows PC and clicking on the tab "Performance" and clicking on "Memory".

ROM: Read Only Memory. Memory which is only needed to be read once by your CPU, normally this is the firmware; a program which loads the OS and you hardware therefore it has a low capacity such as MB. Follows the same logic as RAM: ROM to RAM to CACHE to REGISTERS from the REGISTERS the data is executed. It is non-volatile. This memory can only be read suggested by the name.

CACHE: A type of memory that stores copies of frequently used data. Cache's can be located in a lot of places, naming a few: on your CPU, on a web browser on a game. It has a low capacity as well: MB/KB. Cache in a CPU is faster than RAM because it is located nearer to the CPU.

7:35 - Really helpful hierarchy pyramid in terms of speed and capacity.

[miapearson]

Last minute revision gang, where are you?

[abdullahkhurram]

anyone one else trying to cover the whole paper 1 syllabus in ONE DAY?!? GOOD LUCK FOR WEDNESDAY EVERYONE

[mackenzieraggett]

exams tomorrow, i think you might just save my grade as i know nothing and these are very helpful, thankyou

[corrosive]

I have my mock in a week and I've legit revised just by watching ur vids

[josephcooper]

anyone else not revised until today and just watching these videos hoping it will be enough for tomorrow?

[gliitz]

Good luck in everyone's exam tmrw :)

[awkwardwatermelon]

Why does computing just not sink in for me I'm falling I'm a actually gonna cry

[roxanne]

year 10 mocks atm. will be watching these videos until my gcses! so helpful

[isabellazamudio]

cramming for my mocks tomorrow this helped but I still don’t get any of it 😀pain😀

[imtakingapu]

time to start revising computer science xD great channel

[chunghorris]

9 hours left, in the past 2 days ive watched all these videos along with a bunch of shitty rs.
stress levels

[diochristo]

Love this! Its actually helps me to understand ! Thanks

[dogtotom]

14 hours and i am so nervous hope everyone does well :)

[asadrasool]

Covering the syllabus 4 hours before exam 😅

[ketchurself]

Who else revised this thinking it would come up in paper 1?

[asadzaman]

Just learnt about this channel today. Hope it can teach me the entire OCR course in three weeks 🤞🏽

[nicolasmahmoudieh-kraetz]

Had my exam today, started revising last night at 9pm