Not quite.
DRAM requires refreshing every microsecond or so. The data is actually
stored on a small capacitor. It loses its charge so a refresh cycle is used
to top up (if a 1) or not (if a 0) every microsecond. It is cheap, but
requires extra circuitry.
SRAM is bassically a whole heap of D type flip flops in a chip. Does not
need refreshing.
Both need power.
Rom is made at the factory with a programme.
Prom is user programmable - once.
Eprom is erasable basically by UV light.
Eeprom is erasable by electric charge. This is what stores settings as all
these do not need power. Flash prom is an Eeprom that can be programmed
externally by a serial port (or similar) instead of changing chips.
Foxy
----- Original Message -----
> > Not that I know anything, but isn't compact FLASH, ah, FLASH EEPROM?
> Static
> > RAM would require current to keep the content.
>
> DRAM (Dynamic Ram) requires current to keep state. SRAM (Static Ram) does
> not. Thus the word "static". (No sarcasm intended and should not be read
> as such, but as and explaination)
>
> EEPROM's are static also, but can be erased by UV bombardment....
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