The motherboard (or logic board) is the primary circuit board in the system unit. It supports the electronic components directly related to computation and data processing. Main components include the central processing unit (CPU), main memory (RAM, ROM, and related chips), math co-processor (if any), and expansion slots.
Expansion boards may be added to slots on the motherboard to customize the system. Typical expansion cards include: |disk drive| controllers, internal |modems|, expanded memory, and input/output cards for devices such as |printers|, |graphics|, and |sound systems|.
