A RAM Chip (Random access memory) loses it's stored information when power is lost. A RAM chip can have data written to it.
A ROM Chip (Read Only memory) does not lose it's information when power is lost, but it cannot be written to*
* There are different types of ROM...
ROM (Read Only memory) gets "burned" and cannot be changed.
PROM (Programmable Read Only Memory) (not sure if they're used much any more) can be erased by exposing to ultra-violet light and re-programmed.
EPROM (Electrically Programmable Read Only Memory) - can be re-written electrically with special software.
PRAM (permanent RAM )
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Chip ID
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On-chip memory is a memory that resides on microcontroller itself. e.g RAM. It may be one of the Internal RAM or Special Function Register (SFR). Off-chip memory is external ROM or EPROM.
Memory Modules
It depends on the RAM chip. Some are 1GB, 2GB, 4GB, and 8GB.
The 3200 rating on the MB is just the ram limit you can put just about any speed you want in the board, depending on the speed ram chip you buy is the speed you will get. also know that is you use more than one stick of ram and they are different speeds ex. 1 256mb of pc2700 and 1 256md pc3200 the board will limit the ram speed to the slowesed chip meaning that you ram would acualy be running at the pc2700 speed even thow you have the pc3200 chip in the board ! have a good day
SDRAM modules are available in sizes ranging from 16 MB to 1 GB.
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