a printed circuit board that gives the computer added capability such as more memory or a colour display and plugged into an expansion slot, expansion board - a printed circuit board that plugs into an expansion slot and extends the computer's ability to control another type of peripheral device. All the boards (cards) that plug into a personal computer's bus are expansion boards, such as display adapters, disk controllers and sound cards., arvuti võimalusi laiendav eraldi turustatav pistikmoodul