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chrisgseaton

RO and RA are orthogonal properties. It only makes sense to talk about RW being volatile, but volatility and RA are orthogonal.


timlee126

Why > It only makes sense to talk about RW being volatile, but volatility and RA are orthogonal. ? What is RW?


chrisgseaton

Volatility means it loses values you write - if you can’t write, then what would volatile mean? RW is read-write.


timlee126

Is RO read-only? Is RA random-accessible? Is there ROM also RAM? Can ROM be randomly accessible?


chrisgseaton

Yes most ROMs in practice are RAM. BIOS for example.


MountainAlps582

Think of old arcade machines They have huge chips inside and can be unplugged in the arcade for hours (to be moved around or shipped elsewhere if it isn't being played) There's no OS or anything (maybe newer ones have one but thats beside the point). The code never changes. It's basically written in hardware. RAM however changes within a nanosecond and is powered completely by electricity. Power goes out and memory is gone. It's a completely type of memory The O (only) in ROM is pretty important and not losing data when there's no power is pretty important


SimplyExplained2022

Yes it is correct. ROM = Read Only Memory. It is non volatile memory but it is randomly accessible. Normally ROM con be only read but not written. There is PROM or EPROM or EEPROM that are writtable. RAM is random access memory. It is volatile and random accessible and you can read or write to it. There are different kind of RAM, DRAM, SRAM. In the PC we use the DDR SDRAM. See this about SDRAM: [https://youtu.be/bhSQs9D\_gPo](https://youtu.be/bhSQs9D_gPo)