HP-9100 used in computer-based education (video)



#2

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!


#3

thanks! I love the black and white movie and the voice of the narrator, such adorably old school!

#4

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.


#5

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

#6

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


#7

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


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