# Calculator I am quite interested by these old calculators, sometimes with printer, sometimes not. See: - [[DM42 Calculator]] - [[IDEA - Cloud connected calculator with rp2040]] - [[RPL - HP Calculator Programming Language]] - [Algorithms for RPN calculators : Ball, John A., 1935- : Free Download, Borrow, and Streaming : Internet Archive](https://archive.org/details/algorithmsforrpn0000ball/page/n359/mode/2up) - [Scan of the book above](https://www.dropbox.com/home/Mac/Documents/algorithms-for-rpn-calculators) DIY Calculator Build: [](https://unimplementedtrap.com/media/sb116/SB116-Hero.jpg) - [Unimplemented Trap - SB116 Programmers Calculator](https://unimplementedtrap.com/sb116-programmers-calculator)