Hewlett-Packard takes great care of its customers and provides them with quick and efficient solutions in various areas including connectivity. HP offers its adapters that will help you to make all the required connections without any hassle. HP 1284 LC Input/Output (parallel cable adapter) allows parallel connectivity for the HP OfficeJet d series. It converts your d series all-in-one product to parallel connection, it is quick and easy to install and it is a perfect low-cost option for converting to parallel connectivity.