These Coleco ADAM add-on subsystems came in two flavors with either a 2 or a 4 bay external enclosure. The 2 bay enclosure could handle two hard drives, two floppy drives or one of each. The 4 bay enclosure was a fairly large IBM-PC size computer case used to house up to two hard drives and two floppy drives. In addition to the hard drive port, the interface card provided two serial ports, a printer port and a memory board bank-switching port. 