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.
Definition. RAM is called a random device because the data it stores can be accessed in a random manner, instead of an arranged or set order. Although ROM also permits random data access, it is specifically a read-only device. This means that data stored in ROM cannot be changed or modified. Instead, the data can only be read, or displayed.