Canon Palmtronic F-6 scientific calculator from 1975 (kind of rare now?)
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05-07-2016, 02:37 PM
(This post was last modified: 05-07-2016 02:54 PM by jebem.)
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Canon Palmtronic F-6 scientific calculator from 1975 (kind of rare now?)
Found this one during my last trip to Porto city last week, when looking for vintage books in a old bookstore.
This machine uses a green Vacuum Fluorescent Display with 12 x 7-segment digits. However, two digits are reserved for minus signals and "memory in use" and "Error" annunciations. Another two digits are used for exponent. This leaves 8 digits for mantissa. After power on, the calculator shows a "0.^00". 2^5 (a^x) produces a good enough result of: 31.999974^00 The usual forensic check gives this result: 12.199423^00 (Degrees mode. 9 sin cos tan tan^1 cos^1 sin^1) Trying 1000 ln followed by e^x result in: 999.99964^00 And the classic 1 / 3 followed by * 3 gives a result of: 0.9999999^00 A honest result from this 1975 calculator. Pi internal constant stored value of: 3.1415926^00 Clearing the calculator and doing e^x twice results in: 2.7182804^00 Not as good as a HP-35 machine, but it is not that bad either. The case is very robust and well built and the keys have a good travel when pressed despite having no mechanical clicking, but at least they never fail to register. Jose Mesquita RadioMuseum.org member |
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Canon Palmtronic F-6 scientific calculator from 1975 (kind of rare now?) - jebem - 05-07-2016 02:37 PM
RE: Canon Palmtronic F-6 scientific calculator from 1975 (kind of rare now?) - jebem - 05-07-2016, 02:52 PM
RE: Canon Palmtronic F-6 scientific calculator from 1975 (kind of rare now?) - Bob Patton - 05-08-2016, 12:44 AM
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