HP-9100 used in computer-based education (video) Juergen Keller Unregistered Posts: 304 Threads: 32 Joined: Nov 2005 12-06-2012, 05:00 PM Today I stumbled across a YouTube video that advertises the HP-9100 classroom system and shows computer-based education. This is a fantastic movie and a must view! Besides the HP-9100 calculator, it also shows many peripherals in action. Enjoy! hpnut Unregistered Posts: 408 Threads: 45 Joined: Oct 2007 12-06-2012, 07:48 PM thanks! I love the black and white movie and the voice of the narrator, such adorably old school! Thomas Klemm Unregistered Posts: 735 Threads: 34 Joined: May 2007 12-06-2012, 08:33 PM I enjoyed the lesson very much but wondered what he's actually calculating. increment = 1 ```t = 0.00 s = 0.00 phi = 0.00 t = 1.00 s = 101.29 phi = -9.15 t = 2.00 s = 212.34 phi = -25.78 t = 3.00 s = 340.72 phi = -38.83 t = 4.00 s = 491.39 phi = -48.42 t = 5.00 s = 667.44 phi = -55.39 t = 6.00 s = 870.83 phi = -60.55 t = 7.00 s = 1102.79 phi = -64.46 s = 1102.79 ======= ``` increment = 0.5 ```t = 0.00 s = 0.00 phi = 0.00 t = 0.50 s = 50.16 phi = -4.60 t = 1.00 s = 101.60 phi = -13.58 t = 1.50 s = 155.50 phi = -21.92 t = 2.00 s = 212.89 phi = -29.40 t = 2.50 s = 274.63 phi = -35.92 t = 3.00 s = 341.42 phi = -41.52 t = 3.50 s = 413.79 phi = -46.30 t = 4.00 s = 492.18 phi = -50.37 t = 4.50 s = 576.93 phi = -53.84 t = 5.00 s = 668.30 phi = -56.82 t = 5.50 s = 766.50 phi = -59.39 t = 6.00 s = 871.72 phi = -61.63 t = 6.50 s = 984.08 phi = -63.58 t = 7.00 s = 1103.71 phi = -65.29 s = 1103.71 ======= ``` Here's the Python-program that does it: ```#!/usr/bin/python from math import sqrt, atan2, pi def deg(rad): return 180*rad/pi v = 100 g = 32.2 (x0, y0) = (x, y) = (0, 800) s = 0 t = 7 inc = 0.5 for n in range(0, int(round(t/inc)) + 1): t = inc * n (x_, y_) = (x, y) (x, y) = (x0 + v*t, y0 - g*t**2/2) (dx, dy) = (x - x_, y - y_) ds = sqrt(dx**2 + dy**2) s += ds phi = deg(atan2(dy, dx)) print "t = %6.2f s = %8.2f phi = %8.2f" % (t, s, phi) print print "s = %8.2f" % s ``` Quote: And what would happen if we put in a hundredth? ```s = 1104.01 ======= ``` Can somebody provide an actual program for the HP-9100? Kind regards Thomas PS: Just noticed that the time in the video doesn't seem to be correct: it's always one step ahead. Edited: 6 Dec 2012, 8:36 p.m. Thomas Klemm Unregistered Posts: 735 Threads: 34 Joined: May 2007 12-06-2012, 09:15 PM WolframAlpha told me that the exact length of that path is:  So we can verify the approximation: ```#!/usr/bin/python from math import sqrt, log v0 = 100 g = 32.2 def path(t): v = g*t w = sqrt(v**2 + v0**2) return (v*w + v0**2 * log(g*(w + v)))/(2*g) s = path(7) - path(0) print "exact s = %.20f" % s ``` ```exact s = 1104.0144112415 =============== ``` Cheers Thomas Nick_S Unregistered Posts: 125 Threads: 9 Joined: Oct 2011 12-07-2012, 02:20 AM That is a nice find. However, did I understand correctly the "very reasonable cost" of purchase of the calculator and card reader given at 19mins:40seconds as: over 5 years, 26 programs/class, 6 classes/day, 180 days/year, costing <5c/program, suggesting it worked out at somewhere approaching 7020 dollars at 1968 prices! I wonder how many schools could actually afford one at the time. Nick hpnut Unregistered Posts: 408 Threads: 45 Joined: Oct 2007 12-07-2012, 11:04 AM i am left wondering: - where is the school - what did the students went on to be? scientists? teachers? engineers? home makers? - did HP ever sold large quantities of HP 9100 to schools? i don't think HP is the same company today as it was in the movie. this is compounded by the latest forecast of HP break up in 2013. http://blogs.reuters.com/breakingviews/2012/12/06/hp-breakup-is-on-tech-worlds-2013-agenda/ Tim, if you're reading this, come over to Malaysia where Agilent still has a manufacturing facility. i fear the days of RPN calculators will be numbered. hpnut in Malaysia « Next Oldest | Next Newest »

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