1989 Casio BOSS SF-8000 Business Organizer Scheduling System 64k Digital Diary

Casio SF-6500SY BOSS Business Organizer Scheduling System PC Sync - 128KB Memory

Casio Digital Diary SF-7100SY Plus~1MB~ PC SYNC

Z88 Computing - Softcover Sinclair, Ian

Casio SF-4000 Digital Diary Organizer Calculator Calendar Made in Japan Untested

Casio Digital Diary SF-7100SY 1MB Backlight PC Sync

Casio Digital Diary SF-3905A 128KB with Backlight Display Tested Working

Vintage Casio SF-4300 Digital Diary - 32KB