R.A. Posthumus on Twitter: "@SwissMicros using your #DM42 for a full week on my work and after a firmware update, I must say: Bravo you made a worthy followup on HP42s. https://t.co/kmDLU9dvme" /
HP電卓病が悪化してDM42を買っちゃった : 電子工作やってみたよ
RPN電卓! | となりのふくちゃん
SwissMicros DM42 bezel update and customer support : r/calculators