![The Casio SF-4000 ($109.95) is a "digital diary" with a large, six-line LCD screen that displays any full month… | Graphing calculator, Square roots, Digital diary The Casio SF-4000 ($109.95) is a "digital diary" with a large, six-line LCD screen that displays any full month… | Graphing calculator, Square roots, Digital diary](https://i.pinimg.com/originals/23/c0/ac/23c0ac2465458f146917410dedcd5549.jpg)
The Casio SF-4000 ($109.95) is a "digital diary" with a large, six-line LCD screen that displays any full month… | Graphing calculator, Square roots, Digital diary
![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 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](https://i.redd.it/ffx7e5b5p2h81.jpg)
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
![agenda electronica digital diary casio sf-4000 - Buy Second-hand electronic articles on todocoleccion agenda electronica digital diary casio sf-4000 - Buy Second-hand electronic articles on todocoleccion](https://cloud10.todocoleccion.online/segunda-mano/tc/2018/06/02/18/122977879.jpg)