Casio Digital Diary SF-4000
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The Casio SF-4000 "digital diary" is an early PDA from 1988 which included a telephone directory, memo function, calendar, schedule function, and calculator. It also featured a "secret function" that allowed you to store confidential information that was password-protected, and search functions. The SF-4000 has 32K of memory which equalled to 31,902 characters. It had a six-line LCD screen which could display any full month from 1901 to 2099. It is powered by three lithium CR2032 batteries.
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