The DECswitch is a high-speed (up to 6.7 Mbytes per second), asynchronous DMA parallel interface to the VAXBI. The DECswitch DRB32 uses a 32-bit half-duplex bidirec- tional I/O path to transfer DECswitch data to and from the user device and two 8-bit unidi- rectional paths for control data. A dual register set permits "limitless" data transfers. One version is compatible with the DR11 W providing a UNIBUS - migration path to the DECswitch. Extensive software and documentation makes user designs fast and easy. DRB32-M DECswitch parallel interface; connects to user device within the same cabinet system as the VAXBI system. DECswitch -W DECswitch W Emulator module plus DRB32 M; connects to user - - device within the same cabinet system as the VAXBI system. DRB32-E "Long-line" module plus DRB32-M; connects to user device or another DECswitch-E up to 40 feet outside the system cabinet; a DECswitch external cable must be ordered separately. DECswitch include base option module(s) only. All require one of the following cabinet kits: