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The DS-250 was an electronic keyboard manufactured in 1985 [3] by Seiko and was considered a commercial failure. [4] It was capable of generating both digital and additive sounds. [ 5 ] It is expandable with two expander units DS-310 and DS-320.
The Ruputer is a wristwatch computer developed in 1998 by Seiko Instruments, a subsidiary of the Seiko Group. It was introduced on 10 June 1998. [1] In the US, it was later marketed as the onHand PC by Matsucom. The Ruputer has a 16-bit, 3.6 MHz processor and 2 MB of non-volatile storage memory and 128 KB of RAM.