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Need a manual for the Texas Instruments Ti-56 (55-III) Calculator

Good morning.

I forgot how to change the base for the logarithm-function and the exponent for the n-th root (∛, ∜ and the like) of something. The default base is 10 for the log key and the default is 2 for √.

Now my wife reads a fascinating book about mathematics in the wild and stumbles upon logarithm tables that I have to explain. My French is not awfully bad, but my TI-56 masters the facts much better... ;)

There are links to manuals on the Web, but the manuals are inaccessible or probably existent after a mere 34 years!
I believe that the LED-version of this calculator is otherwise identical to my “Slim LCD” design. And Ti-56 appears to be a European version of the TI-55 III or something. Anyway, around this time, logarithms and roots had probably been composed in the same way on several models of calculators.

So maybe you remember something ?

TIA.

Edit: It may not really serve to explain to my wife that she can calculate log₃ 27
as 1/log₁₀ 3 ∗ log₁₀ 27...
So, I won't.

TY

Hi,

I have the TI-55 II Scientific Calculator Quick Reference Guide in PDF format if you want a copy... Just PM me.

Bodge99.

Google a little.

https://www.rskey.org/CMS/index.php/the-library/12

Code:

curl -LI http://bulk.rskey.org/BULK/CALCDOCS/TI/SR56.PDF

HTTP/1.1 301 Moved Permanently

Date: Mon, 30 Dec 2019 14:48:47 GMT

Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips mod_fcgid/2.3.9 PHP/5.6.40 mod_wsgi/3.4 Python/2.7.5

Location: https://airy.rskey.org/CALCDOCS//TI/SR56.PDF

Content-Type: text/html; charset=iso-8859-1



HTTP/1.1 200 OK

Date: Mon, 30 Dec 2019 14:48:48 GMT

Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips mod_fcgid/2.3.9 PHP/5.6.40 mod_wsgi/3.4 Python/2.7.5

Last-Modified: Thu, 03 Apr 2003 20:09:21 GMT

ETag: "2e704b-3ba6c9baa5e40"

Accept-Ranges: bytes

Content-Length: 3043403

Content-Type: application/pdf

Code:

curl -LI http://bulk.rskey.org/BULK/CALCDOCS/TI/SR56APLB.PDF

HTTP/1.1 301 Moved Permanently

Date: Mon, 30 Dec 2019 14:52:53 GMT

Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips mod_fcgid/2.3.9 PHP/5.6.40 mod_wsgi/3.4 Python/2.7.5

Location: https://airy.rskey.org/CALCDOCS//TI/SR56APLB.PDF

Content-Type: text/html; charset=iso-8859-1



HTTP/1.1 200 OK

Date: Mon, 30 Dec 2019 14:52:53 GMT

Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips mod_fcgid/2.3.9 PHP/5.6.40 mod_wsgi/3.4 Python/2.7.5

Last-Modified: Fri, 04 Apr 2003 21:22:24 GMT

ETag: "12bf9e2-3ba81bec10400"

Accept-Ranges: bytes

Content-Length: 19659234

Content-Type: application/pdf

http://bulk.rskey.org/BULK/CALCDOCS/TI/SR56.PDF
http://bulk.rskey.org/BULK/CALCDOCS/TI/SR56APLB.PDF
http://bulk.rskey.org/BULK/CALCDOCS/TI/SR56CODE.PDF

Quote:

Originally Posted by teckk (Post 6072564)

Google a little.

Two days ago, I had been on that list and have seen that there is a manual for the SR56 but I could not open the referenced PDF-file. The response was a 404 error.

Today I have opened this manual and must admit, that my TI 56 does not have a key for x-th root of y, only a square-root. Both calculators are then different and there is still no manual for the TI 56. :(

Quote:

Originally Posted by Michael Uplawski (Post 6072131)

...the manuals are inaccessible or probably existent after a mere 34 years!

After 40 years my leather sandals have finally worn out... sigh. $50 out the window :rolleyes:

But you're in luck as a TI calculator can be hers for a meagre $9 :D

Quote:

Originally Posted by Michael Uplawski (Post 6072131)

In a pinch, for calculating "log base N" you can always use the formula

Code:

logN(x) = log10(x)/log10(N)

On my TI-34 and TI-35 PLUS, it's

Code:

N LOG STO      # Get log10 of N and store it in memory

x LOG/ RCL    # Get log10 of "x" and divide it by what's in memory

or on my TI-36X SOLAR (which has up to (count 'em!) three memory locations):

Code:

N LOG STO 1    # Log10 of N, store it in memory "1"

x LOG / RCL 1  # Log10 of "x" divided by the contents of memory "1"

The Nth root of "x" can be found using:

Code:

10^(log10(x)/N)

Code:

x LOG / N (10^2) # (10^X) is a dedicated button on all of my TIs.

If your calculator does this with only 1 or 2 keypresses, I'm jealous. (Or I would have been as a student.)

This post has now got me wondering why I have so many old calculators laying around... and within easy reach.

Cheers...

Thank you for the programmed examples. I will use them.

However, as the TI-56 in question is dearly loved by my wife who extends her horizons considerably by reading books (of all choices), the time is not ripe for hitting the LRN key. ;)

From the TI 55 II manual that bodge99 sent me I learn that these calculator models do not forcibly resemble each other as much as I hoped for, at least as the root- and logarithm-functions are concerned.

For the root function, I can use the INV + “y pow x” combination, although it is not very pedagogic. It is paper and crayon for the logarithms with bases != 10.

Thanks all!