Sharp electronic organizers with the IC card slot (Wizard OZ/IQ/PA/PI series)

[Akuji]

(03-30-2021 02:55 PM)Dave Britten Wrote:  But if you can find a three-color electronic sign from Seiko made around 1990, then this might be what you would use to program it.

So I've contacted MK Seiko, and you are right: the card was used to control the 'Art Sign' LED display, a general-purpose information board for stores released in 1990. Unfortunately, they couldn't provide any additional information or instruction manual.