Casio AT-550 "Janus" legendary touchscreen calculator watch Japan 1984
Casio AT-550 "Janus" legendary touchscreen calculator watch Japan 1984
This watch is amazing
1 careful owner from new who bought it in 1984
Fully working in perfect condition
- Invisible Touch Digitizer: Unlike modern capacitive smartwatches, the AT-550 utilized a transparent digitizer layer over the glass. This allowed the entire screen to function as a touch surface without a visible grid of buttons.
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Gesture-Based Calculation: Users could perform math operations by using a finger to draw numbers and mathematical symbols (like
+,-, or=) directly onto the glass. - "No-Look" Interface: The gesture-recognition system was designed so users could write out equations dynamically without needing to look directly at small physical buttons.
- Ana-Digi Design: It featured a streamlined aesthetic that combined traditional analogue clock hands (hour, minute, and seconds) with an underlying digital LCD window.
AT-550 (Janus Read Sensor)
Touchscreen watch ahead of its time
This watch not only boasted a streamlined design combining analogue hour, minute, and seconds hands with digital LCD, but was also equipped with a calculator function allowing manual input. Users could draw numbers and math symbols with a fingertip on the glass, and the LCD would then display the formulas and calculation results. This epoch-making watch is still known as one of the first watches with the kind of gesture recognition people use today on smartphones and smartwatches. Not bad for the early ’80s.
The technical achievement was significant. The touch sensor incorporated a transparent terminal switch as the cover-glass of the watch face. The originally developed Finger Trace Recognition System (FTRS) provided character recognition architecture that delivered accurate results regardless of factors such as the size of the letters or where characters were traced on the screen. This was a true pioneer in wristwatch multi-functionality requiring no physical buttons.
