The oral mucosa in the area of crenation is usually of normal color, but there may be erythema (redness) if exposed to a high degree of friction or pressure. Crenated tongue is usually asymptomatic and harmless.
ROM stands for read-only memory. It's used to store the start-up instructions for a computer, also known as the firmware. Most modern computers use flash-based ROM. It is part of the BIOS chip, which is located on the motherboard.
PC desktop RAM temporarily stores data and instructions for use by the central processing unit (CPU). System memory is referred to as RAM, which stands for Random Access Memory. Modern system memory can store data in different areas, which can be accessed randomly.