Connects to the external expansion port of the A500 and provides it with SCSI via a 50pin internal header or a 25pin external port. The 25pin external connector was not normally supplied as part of the unit but could be obtained seperately or added by the user themselves. This unit was generally not supplied with a hard drive unless the dealer decided to add one themselves. There is also an additional RAM board containing 8 x 30pin SIMMS for a maximum of 8MB which is described here. The whole unit including the sub expansions could be powered directly from the A500, however an optional power supply was also available to lighten the load of the A500s PSU.
Thanks to Thomas Newsom and Ron Mascaro