The PC Datagraph was dubbed the world's smallest computer terminal. This is one of our favorites and also one of the harder to find models of Seiko wrist terminal line. The display was an unusual three-line dot-matrix type. Reserved for the display of time, the lowest line was considerable larger in size than the upper two. The watch had 2K of storage, its capabilities of course were determined by the size of programs. It communicated with popular computers of the day like the Apple II, II+, IIc and IIe; Commodore 64 and IBM PC and PC Jr. using a cable and communication software. The software was distributed on a floppy disk much like that of the RC-1000. Segment from an excellent article on Seiko Computer watches from the PCS site See Article

WATCHES WITH MODULE S521

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