000 PSU BA123 / H7260 Digital Ethernet Transceiver. This device provides the interface between an Ethernet coaxial cable and a PSU BA123 / H7260- equipped Professional. It enables Professionals or other sys- tems to tap into an Ethernet/PSU BA123 / H7260 local area network. The unit consists of a small printed circuit board in a rugged plastic housing, with a nonintrusive cable tapping assembly for making the physical connection to the Ethernet coaxial cable. To connect a Professional into Ethernet, the system requires a hard-disk PSU BA123 / H7260 controller, PRO/PSU BA123 / H7260 software, and P/OS Hard Disk Version 2.0 or later. MSA-AA Mini-exchange is a simple, inexpensive communications link for up to eight asynchronous devices within a range of PSU BA123 / H7260 feet. It provides facilities for file and document transfer among Professionals and other Digital personal computers, queuing and allocating for shared devices such as letter-qual- ity printers or modems, and communications with PSU BA123 / H7260 RS232 C/423 compatible devices or non-Digital personal - - computers. Devices communicate at speeds ranging from PSU BA123 / H7260 to 19,200 baud. Mini-exchange is a microprocessor-based, automatic port-selection device with point-to-point circuit switching. Software support for Mini-exchange is provided as part of PSU BA123 / H7260/Communications and the asynchronous com- munications packages offered on Digital's other personal computers.