Your First Handheld?

[NEOHGuy]

A used K&E Decilon sliderule bought from another college student when he upgraded to a TI-10.

Calculator wise, a used HP-45. Bought it from another college student whose mother worked for HP. He upgraded to the HP-65. I still have the HP-45, although the battery pack is long dead. I can power it up using the AC adapter however. I also have a few solution books from that era.

Along the way, I can also recall (somewhat fuzzy though), an HP-19C, HP-27C, HP-32ii, HP-34C, HP-12c, and my original HP-41C. Also, some knock off of the TI-55 or so, a Sinclair I believe?

Last, I have obtained several HP-12s, through TAS, some to give away, and one for myself (old school ones, not latest generations). Also through TAS at great expense an HP-41CX, math/stats module, financial module, Advantage module, and the PPC ROM. The modules I had previously with my original HP-41C for nostalgia's sake. Back then I also had the Stress and Mechanics modules as well. Sadly, all were lost when I junked the calculator due to the corrosion on the connectors.