Found this old gem today... Vintage Casio SF-4000 'digital diary' from 1988. Featuring a whole 31,902 characters of battery backed storage. : r/retrobattlestations
CASIO SF-4000 OPERATION MANUAL Pdf Download | ManualsLib
casio digital diary sf-4000 - funciona - Buy Other vintage objects on todocoleccion
Casio SF-4000 Digital Diary PDA (año 1988) - YouTube
VINTAGE CASIO DIGITAL DIARY SF-4000, Made in Japan. | eBay