Dell Chengming 3980 can be customized and can be equipped with two PCI slots and optional parallel ports to support the needs of tax control system access card slots, invoice printing, and medical systems. Chengming cooperates with well-known providers in the industry to provide users with 4 serial ports to facilitate customers to access components such as ciphers and card readers at the same time. You can contact the manufacturer to customize or purchase in bulk according to your needs.