There are two types of operating memory used in computers-ROM (Read-Only Memory) and RAM (Random Access Memory).
ROM is permanent memory that cannot be erased or added to whatever information is stored there is stored in the manufacturing process.
ROM is typically used for storing the kinds of information that give a computer its unique personality and structure for operation.
ROM is often used for storage of waveforms (for sounds) in synthesizers.
RAM is memory that can be written, read and erased continually.
RAM is used for moment-to-moment storage as the computer operates.
The amount of RAM available to a CPU can have an effect on how complicated the routines are that can be accomplished with the computer.
The more RAM there is available, the more complex and comprehensive the programs that can be run-Music programs
When dealing with multimedia (i.e., sound and video), RAM capacity is an important consideration.
Memory capacity is a function of the number of bytes available, typically measured in thousands, million, or billions of bytes. The units of measure are as follows:
Kilobytes (KB) = 1,000 bytes·
Megabytes (MB) = 1,000,000 bytes
Gigabytes (GB) = 1,000,000,000 bytes
Currently, having from 2 to 4 Gigabytes of RAM is adequate to handle most common programs, although high-end graphics, video and music programs require more.
We are now moving towards the Terabyte.