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Running the Calendar function
Profile view
Unfolded
Top and back sides
Main card with the Sharp custom all-in-one controller and 2 x 128 KB Toshiba memory chips,
Display card with the display controller located behind the LCD display.
Carefully taken apart. This kind of 2-card organizer is not easy to open.
YO-550, same model but includes the American Heritage Dictionary.
User manual
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