In addition to the alphanumeric capability, the HP-41C (first version in the series) came with 63 “registers” of memory, which could be reassigned between storage memory and program memory. The four ports on the top allowed users to plug in additional RAM modules, offering additional register or program space. It was revolutionary!
I was first introduced to the legend in 1983, when my employer at the time presented me with a brand new 41C as my going-away gift after having been his only employee for the previous two years. I was relocating for my wife to attend college, then my plan was to attend engineering school upon her completion. As an appreciation for my service and encouragement to pursue engineering school, my boss invested about $300 in me, which was a lot of money back then—certainly, more than I could afford. At the time, I had no idea how much that investment would pay off. Thank you, Mr. Schneider.
Upon relocation in August of 1983, I quickly landed a job at an engineering firm working on the field crew and performing office duties as needed. My party chief also had a 41, but his was the newly released CX model, which had advanced memory capabilities and a time module, and a few additional features. Still, my C model was useful in the field and I soon bought a leather pouch for it.
But, I needed more functionality in the form of modules, so I bit the bullet (about $400 if my memory is correct) and invested in the CX with the survey module. With each module came an overlay board to show the keyboard functions when running that module. Brilliant!
Besides my growing field role at work, I was starting to study for the Land Surveyor-in-Training (LSIT) examination and enrolled in evening survey courses at the local community college. I was quickly becoming familiar with my new and powerful 41CX and loving it. Horizontal and vertical curves? No problem. Traversing and inversing, including areas calculations? A breeze. Bearing-bearing intersections? Simple.
Writing down coordinates (or storing them) and watching the “goose” fly across the screen was a small price to pay for having a computer in my hands. I was using it so much in the field that I bought customized Ziplock-type baggies to seal the dust out of it. I went through a bunch of those in the day.
Over the next few years, I successfully passed the LSIT examination and the California Professional Land Surveyor examination and enrolled in engineering classes full-time. I had purchased the statistics module, at least, and rarely went anywhere without my 41CX on my hip or in my backpack. Although a few of my classmates in the engineering program had 41C series calculators, none of them had logged the hours on them that the “old man” in the classes had.
Magic!
I specifically recall participating in a study group for a physics course in the library one afternoon. We were studying multiple forces on an object (known as a free-body diagram), all pulling or pushing with different magnitudes of forces in different directions. Think of a pack of large and small dogs pulling on an object in different directions all at once.
We were taught two methods of solving what the result would be on that object: which direction would it move and how fast? The forces were typically given something like this: Force 1) 10 Newtons up by 6 Newtons to the right, and so on.
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