Casio SF-4000 Digital Diary — one of the first mass-market electronic organizers (predecessor to modern smartphones and PDAs), dating back to the period of 1988–1991.
Background: The SF-4000 model was introduced in 1988. This was the "golden era" of electronic notebooks, when they were considered a status business accessory.
Condition: The body and box are in excellent "Near Mint" condition. Original instructions and packaging are included.
Features: Telephone directory (up to 1,500 numbers), notepad, calendar, task planner, and a 10-digit calculator.
Memory: 32 KB (approx. 30,000 characters), which was an impressive volume for 1988. The memory has not been reset.
Display: 6-line monochrome LCD screen. It is ultra-high contrast for its time.
Power: Operates on 3 CR2025 lithium batteries (new ones installed).
Product Quality:
A perfectly preserved specimen of late-80s Japanese technology.
