Abstract: An adapter for providing data communications for a personal computer to other remote data communications systems of various communication platforms is disclosed. The remote data communications systems can be a data circuit terminating equipment (DCE) such as a modem, or a data terminating equipment (DTE) such as an ISDN terminal adapter. The adapter comprises a programmable digital signal processing device, a memory device and an assortment of transceiving devices. A software program is stored in the memory device for instructing the programmable digital signal processing device. The transceiving devices are controlled by the programmable DSP device such that the appropriate transceiving device can be activated for providing data communications, according to the type of communication platform utilized by the remote data communications equipment.