RARE 1989 Hard Disk drive unit for Atari ST Computers made by Systems 2000 Computers Ltd. Possible the AT20 stands for twenty megabytes, but unconfirmed.
Unboxed, and untested but in Excellent condition, physically close to 10/10. Has built in ribbon cable going to an Atari ST Hard Drive plug. Front has two LEDs, yellow and green, rear has power switch and standard kettle plug power input socket.
Very heavy at 5.4kg, so will be expensive to send overseas.