RAM is erased every time the system is turned off. ROM is read-only memory. This memory is used for the long-term storage of programs and data as firmware on a chip. DRAM is cheaper and more often used as base, or main, memory. SRAM is static RAM and does not have to be refreshed almost continuously.
Parity is a binary calculation used as a checksum to verify a single byte of information.
This parity bit is stored in the ninth bit position of the byte being checked. Bus structures are the heart of the data communication process. AT-class system board designs are more common. ATX computer system boards have an updated design and require an additinal 3.3v line on the power supply. In addition, the case must allow for the redesigned peripheral port connections.