The Casio CM-100 Computer Math Calculator is perfect for computer science students or professionals that need to quickly convert binary to hex to decimal and do digital logic operations like and or not xor and more. I'm the original owner and found this in its case. I used this 1989-1994 occasionally in school. Its like time machine grade- almost mint. Buttons all work great. Solar cell and lcd are working perfect. What great engineering from Casio!
eBay