Everyday use of programmable Calculators without Continuous Memory/Storage Devices

[Steve Simpkin]

I used my HP-25 for almost 10 years as my only calculator through high school, 4 years of college and 2 years at my first job as an electrical engineer. There were a few programs that I used semi-often (Lunar Lander!) and were documented but for the most part, I didn't need the same program twice so the lack of Continuous Memory was not a big deal for me at the time. I replaced it with a HP-11C in 1987 and really appreciated the non-volatile memory. My needs had changed by then and I built up a library of frequency used programs that I kept on the secession of HPs that I had after that.