Software Publisher's ATR8000
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The Software Publisher's (SWP) ATR8000 was a dual purpose system, it would act as a disk drive for an Atari 400/800 (6502) system, using a serial 19200 baud bus (RS232), or using the Atari as a 40 or 80 column terminal it would run CP/M 80. Here is a link to some additional information: http://www.atarimagazines.com/v2n4/productreviews.html