
A collection is built little by little, object after object almost without knowing that we have just put our fingers in a gear...
And then there is the joy of discovering the unexpected object that we miss, then the wonder when it arrives and we open the package.
In chronological order of arrival of the calculators, I have described here my feelings, my surprises...
So the history of the construction of a collection, day after day...


My first TI... 

While I have been working as a programmer since 1974, I was tempted, at the time, to acquire one of the programmable hex cards (Kim1, MK14 .. .), cards nicknamed "university cards".
But, in 1979 I chose a TI58C, unrelated to my initial temptation.
This TI58C will be purchased with a PC100C printer and other accessories ...
It will be the beginning of a devouring passion still today ... a first love that lasts!
(See page My TI58C)



My son's TI... 

In 2020, I found my son's TI82 Stats.fr calculator, the one he used in high school eleven years previously (2009) and I tried it ...
In addition, a cable allowing connection to a PC accompanied the TI82 Stats.fr ...
I not only had the surprise to find the same sensations and the same pleasure that forty years ago when I discovered my TI58C.
Now it is no longer my son's TI
... but mine: my second TI !
(See page The TI82 Stats.fr)



The TI "birthday"... 

For my 66 years (2021), I received a TI66 calculator as a gift.
So I started to discover this new TI66.
I find it very beautiful, light, fine ...
But a little disappointment: I don't have the PC200 printer and there are some differences with the TI58C:
no library modules,
no HIR instruction,
no DSZ instruction on registers greater than 9 ... which was done by cheating with the TI58C.
I'm still happy to have this lovely little gem.



...and the others 

After finding the TI82 Stats.fr and receiving the TI66 as a gift, I started looking for other TI programmable calculators ...
... with the desire to find the TI59 that I had never had.
And I ended up finding ...


TI62 

For my 62 year birthday it was too late ...
But in July 2021, I made up for it and found a new TI62 in its original box, accompanied by its manual still in plastic.
I find it as beautiful as the TI66, and I wonder if I will not go looking for some TI Galaxy calculators, even nonprogrammable.



TI57 II 

In 1978 I hadn't been attracted to the TI57 at all ...
And I regret it a little today.
I found a new TI57 II in its original box. (August 2021)
It is very pleasant to use and I find it quite aesthetically as well.



TI59 

Finally, in August 2021, I unearthed the famous TI59 ...
She was hiding in Spain and seemed to be waiting for me.
The young woman who was willing to sell it to me wanted an exorbitant price because of the affection brought to this calculator which belonged to his parents.
We ended up finding a reasonable and satisfying deal for all of us.
New in appearance, having been used very little, the TI59 was almost complete since all that was missing was the manual (found elsewhere).
It was in its original box with:
its plastic case,
its power supply,
the Master module with its small documentation,
some new magnetic cards,
a drive cleaning kit,
and several programming sheets.
The box had suffered, but the calculator, and its battery pack, showed no signs of corrosion.
It worked very well ... then each time the player is switched on, the reader runs continuously and the display flashes ...
I will try to solve this annoying problem ...
In any case, thank you Maria del Mar !



TI95 

As soon as the TI59 arrived, I found a new TI95 in its original box (and shipping box Texas Instruments !).





A magnificent machine !
The TI95 is a big size: 96 x 204 x 25 mm, not really a "pocket".
But what a machine ! A real "picocomputer".
The manual contained in the box is in German, I have to print one in French and bind it.
All I will need is the tape recorder interface to record the programs, plus the PC324 printer and the math module.


TI57 LCD 

At the end of August 2021, I found, also in Germany, a TI57 LCD.
Unfortunately she suffers from the known disease of these calculators: the crazy keyboard !
I knew that Texas Instruments had reviewed the technology of the keyboards of the TI55 II, TI57 LCD, BA55 to replace them by TI55 III, TI57 II, BA54 with a better keyboard, but I took the risk of 'buy a TI57 LCD.
So I'll have fun with the TI57 II.
Despite everything, the TI57 LCD remains very beautiful with pretty colors.



and after... 

After my acquisitions this summer 2021, I am missing calculators from the lines 57 and 58 / 59 ...
It is not easy today to find some models in working condition and a calculator that does not work does not really interest me.
And my preference is for calculators complete in their original box with the manual in French, possibly in English.
My criteria therefore drastically limit my research.
So now I am missing one of the following calculators:
SR52, SR56, TI57, TI58 and TI88 ...
For the last one, the TI88, I'm not dreaming ...
Considering the rarity !
For the others, I find some TI57 and TI58 quite often with the original box, but without the charger or without the manual and each time not functional!
As for the SR52 and SR56 the very rare finds are real ruins!
Maybe I'll let myself be tempted by a "cousin", another programmable TI:
TI65, TI68, TI60, TI60X, TI67, TI51III, TI55II, TI55III, TI56, < b> TI42MBA, BA55, BA54, TI55, TheMBA, TI53 ...



TI56 
Completing my small collection of the line of 57/58/59 "classic" programmable , this "cousin"arrived from France on September 4, 2021.
This TI56 is in the aesthetic line of the "slanted" calculators quite similar to the TI57 II.
It is however 8 steps more than the TI57 II : [2nd] [Part] [1] gives 56.1 on the TI56 instead of 48.1 for the TI57 II .
Normal, the TI56 is not another version of the TI57 IIbut the European version of the TI55 III !
Why name it 56in Europe and 55 IIIin the United States ???





TI60 
Completing my small collection of the line of 57/58/59 "classic" programmable , this "cousin"arrived from Germany on September 4, 2021.
This TI60is in the aesthetic line of the "slanted" calculators but of a black color making it a little more "class".
Many unusual functions give it a certain appeal:
conversions of imperial units (gal, lb, in) to metric units (l, kg, cm),
use of hexadecimal and octal,
and many others functions (statistics, integration, ...)
Note that the partitioning is done in hexadecimal: [2nd] [Part] [C]for 12 data memories, and the addressing of the registers is also done in hexadecimal: STO Ainstead of STO 10 , STO Binstead of STO 11 .




TI67 

To complete the "60s" series I bought a TI67.
Almost new in its original box with its small booklet, the TI67 has the shape of a Galaxy but is not framed in metal like 62 and 66.
It is entirely made of plastic and does not fit in a pouch or in a box but has a cover in which it slips like a drawer. (As TI "graphing" calculators will do later)
Its presentation and colors are reminiscent of a calculator from a competing brand ... ("High Price" ...)
The handling is pleasant and I am positively surprised.
My first program is written in a few minutes and gives me real pleasure: the language is a mixture of old AOS language and a simulated TI Basic.
The program is written on one line, the instructions being separated by the character ":" (colon).
The program is not measured in number of steps but in bytes.
The TI67 has 90 memories and 1536 bytes available for programs.
The numerous functions: mathematics, statistics, formulas, sequences ... and the programming methods presage of future "graphics" calculators.
Everything is already there ... except the graphic screen !
The TI67 is a great find and I feel like I'm going to have a lot of fun.



TI55 / TI55 II / TI55 III 

The TI55, TI55 II, TI55 III arrived together on the same day, the first day of fall.
All three came from the United States, the TI55 from Minnesota, the TI55 II from Texas and the TI55 III from California.
The TI55 was in its original box with the Owner's manual, the "Calculator DecisionMaking Sourcebook", the bag and the charger (US plug, 120V).
Everything was new, never used, and the batteries charged without problem, I just had to use a French charger (French plug, 220V).
The TI55 is beautiful, really brand new! And very pleasant to use.
On the three calculators I am starting my first attempts to compare behavior.
I know that the programmability of the TI55 is very light since, in addition to a program size limited to 32 steps, it is not possible to use other branching instructions than the classic RST.
But for the TI55 II and TI55 III the behavior of the RST instruction in a program presents a very important drawback.
Indeed if on the TI55, RST makes it possible to continue the execution of the program after returning to the step 00 of the program (which allows a simple loop), on the TI55 II, TI55 III (and therefore the TI56) execution stops after returning to step 00.
No loops possible on these calculators: the documentation is unfortunately very clear on this principle of stopping at step 00 !




But...
In reality my new TI55 II can be qualified as a rare calculator.
In fact, it is not really a TI55 II : it is a TI55 III of the first series which however still uses the designation TI55 II.
These “socalled” TI55 IIs were produced in Taiwan between October 1984 and March 1985.
Mine was made in Taiwan in October 1984.



TI65 

With the TI65 I expected to be surprised ... and I was not disappointed!
I knew that the most surprising feature on the TI65 is a persecond stopwatch which is managed using the TUp or TDn instructions.
I knew the TI65 had a lot of programming features:
unconditional branching (GTO),
conditional branching (x<m, x=m, x>m),
the labels (LBL),
the subroutines (SBR, RTN),
a DSZ loop statement,
...
and many other possibilities (decimal / octal / hexadecimal, conversion of measurements, integration, statistics ...)
Then two function keys F1 and F2, dynamic memory allocation and hexadecimal numbering of the data registers completed the surprise.
But the most astonishing remains the internal codification of the programming instructions: LBL F1 is displayed "2nd53.53", the instruction x=m is displayed "3rd 43", GTO 2 is displayed "2nd 54.2" ...
(see the factorial calculation program)



The MBA / BA55 / BA54 

The TI "The MBA" arrived from the United States (Garland, Texas) along with the small booklet serving as a manual, which arrived from Canada (Vancouver, British Columbia).
And by the greatest of luck, the same day arrived the BA55 from the United States (Elkins, Arkansas) and the BA54 from Canada ( Montreal, Quebec).
The TI "The MBA" is of the "Majestic line" style like the TI55 and TI57, a style that I really like. But it is distinguished by a "Gold" color background instead of the traditional black background.
The BA55 and BA54 are "Slanted" like many other calculators from the same era. < BR>
The BA54 is the replacement calculator for the BA55 following the disaster of the keyboards of the first "Slanted "(inclined).
(Just as the TI55 II, TI57 LCD ... were also replaced)
The TI "The MBA" does not have its original batteries (BP7) but has been adapted to receive a 9V battery (6LR61). It works very well. But ...
On the programming side, as expected, the TI "The MBA" does not have great possibilities just like the BA55 and BA54 .
That none of the three have trigonometric functions is not surprising, but the lack of parentheses on the BA55 and BA54 confuses me a bit. .
I'm not going to have the most fun with one of these three calculators!




TI68 

With the TI68 I expected not to be surprised ... and I was not surprised!
I knew that for the TI68 it is better to talk about "formulas" rather than programs since no sequence of instructions is possible, just the definition of formulas.
It is nevertheless very rich in functions and I will delve into its manual.
As for the TI60X, which has no relation to the TI60, it is only a derivative version of the TI68 with a seemingly bizarre but nevertheless pleasant display.
Despite everything, I found these two calculators very nice to use.



TI53 

In its original box, the TI53 is as I expected.
With a single data memory and 32 program steps and the impossibility use branching instructions other than the classic RST, the TI53 is not the most programmable of programmables...
But the documentation, a user manual and an accompanying application "library", offer surprising examples of small programs.
I think against all odds I'm going to spend some time studying all of these programming examples.



SR56 

The SR56 is of a "Classic" format which I find very pleasant.
It did not light up but the batteries (BP1) did not appear to be corroded. I didn't have the charger so I chose to use my PC100C printer to charge the batteries.
Two hours later I installed these batteries in the SR56 calculator ... it works wonderfully !
I hastened to grab my first program. Awesome !



TI57 

The TI57 batteries were completely corroded. So I put an adapter for 9V batteries (6LR61) and of course a 9V battery. (You have to reverse the wires: red on black and black on red.)
The TI57 works like the first day!
I didn't have a case for this calculator, I found one that came from Hungary in 4 days!
I will now be able to use the many programs for TI57 published at the time...



TI51 III 

When the TI51 III arrived I had no surprises knowing that TI51 III was just the European name for the TI55, nothing more, nothing less.
But I'm glad because it was more difficult to find one TI51 III than its American version the TI55.




and also... 

A second TI57
Why still a second TI57 ?
Because I just wanted to verify that replacing the BP7 battery pack with a 9V battery adapter (6LR61) was still the solution for a TI57 that was declared nonfunctional.
And it worked again: the TI57 came out of the coma it had been in for many years.
(I was also won over by the unusual pouch.)



A second TI57 II
Same question : why still a second TI57 II ?
The answer is in the photo: bottom left on the calculator...



SR52 

My SR52 arrived with its unfortunately defective AC9900/E Adapter / Charger.
In addition, the BP1A battery pack was completely corroded and one of the calculator's internal contactors was broken.
Despite all of these misfortunes I used a universal adapter and the SR52 is back to working order.
I was surprised by its "plump" side: it is bigger than a TI59 (its bag is double in thickness).
I quickly wrote my first programs with an unexpected surprise: the lack of program step economy !
STO (RCL, EXC...) takes 3 program steps: 42 00 01 instead of 42 01 and GTO address costs 4 steps !
But I find all the pleasure of old TI...







TI58 

With the TI58 I finally complete the legendary trio: TI58, TI59 and TI58C !
I already had the TI59 and TI58C but not the TI58 ...
It's not the most exciting of the three: no card reader and no constant memory.
It dates from 1979 and it still works!
So I'm going to play around with it for fun, but not too long: I don't want to reenter the same program every time I turn it on again.
And I will not fit the longest programs ...



TI55 III 

I already had a TI55 III, so why a second one ?
Because the history of the TI55 III is a little bit complicated...
... and because I already had several TI55 II which are not called like that but are nevertheless TI55 III.
All was started with the TI55 II whose faulty keyboard forced Texas instruments to review its copy.
The TI55 II that I thought I had in my collection was not actually this TI55 II with a poor keyboard but a TI55 III from the first generation manufactured in Taiwan in 1984 by Inventec and stamped TI55 II (with just one missing "I").
Then I got a TI55 III made in the USA in 1987 which I believed to be the only one real TI55 III.
I had just forgotten the facetious side of Texas instruments...
Because there was a TI55 III absolutely identical to the TI55 II of the first series but with the missing "I" finally added. This TI55 III was also manufactured in Taiwan (Inventec) but in 1985.
This whole TI55 III story could have been ended there, but...
The TI55 III has become the TI56 in Europe, just for marketing.
The first jet of the TI56 was manufactured in Taiwan in 1985 by Compal Electronics. Then the production was continued in Italy.
There are 3 different versions of the TI56...
If I recap, today I have 6 "TI55 III":
one TI55 II "Taïwan I1084" (with one missing "I"),
one TI55 III "USA LT 0187",
one TI55 III " Taïwan I0685",
one TI56 "Italie RCI 3587",
one TI56 "Italie RCI 4487",
one TI56 "Taïwan C0585".
Until my next discovery !








TI55 II "Taïwan I1084" 
TI55 III "USA LT 0187" 
TI55 III "Taïwan I0685" 
TI56 "Italie RCI 3587" 
TI56 "Italie RCI 4487" 
TI56 "Taïwan C0585" 


TI55 II 

The TI55 II, the real one made in the USA in 1984, does not and cannot look like a TI55 III !
"Slanted" of the first generation, it is distinguished by its infernal keyboard ... (just like the TI57 LCD and BA55)



TI57 II 

I already had a TI57 II, so  why a second one ? 
 why a third one ? 
 why a fourth one ?... 






DATE CODES 
MADE IN... 
"TEXAS" LOGO POSITION 
BOTTOM RIGHT TEXT 
NUMBER KEYS 
ARITHMETIC KEYS 
C0385 
Taiwan 
at the bottom left 
PROGRAMMABLE CONSTANT MEMORY 
yellow 
grey 
C1184 
Taiwan 
at the bottom left 
PROGRAMMABLE CONSTANT MEMORY 
white 
blue 
RCI 3885 
Italy 
at the bottom left 
PROGRAMMABLE 
white 
blue 
RCI 3587 RCI 0888 RCI 3186 
Italy Italy Italy 
at the top right 
PROGRAMMABLE 
white 
blue 



TI53 

I already had a TI53, so why a second one ?
Because the first, dated 1979, is from the generation of "Slimline" (ultraflat) calculators while the second, dated 1985, is from the "Slanted" !
(There is another TI53 "slanted" made in Italy from 1986... not found !)



TI57 LCD 

I already had a TI57 LCD, so why a second one ?
Because my first, dated 1983, made in Italy is not exactly the same as my second, dated 1982, made in the USA !



TI68 again... 

A second TI68 has arrived... (by plane from Ottawa  Thanks Andrew)
A version 2 of the TI68 : the one where plastic replaced metal (and screws disappeared) !



TI60 again... 

A second TI60 has arrived...
A version 2 of the TI60 with the mention "Advanced Scientific" !



TI62 again... 

Why a second TI62 ?
Just for fun and a great opportunity... (less than 10 €)



A third TI57


Why still a third TI57 ?
This is the first version of the TI57, assembled in Italy from 1977, with the text "Texas Instruments" and the logo printed on a metal plate stuck on the TI57.



Radio Shack EC4000 

A Radio Shack EC4000 calculator arrived from Belgium in early 2022...
However, I do not deviate from my center of interest: Texas Instruments programmable calculators !
The Radio Shack EC4000 was manufactured in Lubbock, Texas (USA) in 1978.
It's a real TI57 and only the exterior aesthetics are slightly different.



My "Fr" graphing calculators... 

My son's TI82 Stats.fr calculator was not the first graphic calculator in French version produced by Texas instruments ...
This one, black and dating from 2009 was preceded by another TI82 Stats.fr also in French version but red and dating from 2006.
So I gave in to the temptation to have a second TI graphic in French version (with a 60page booklet and the complete manual of 260 pages).
I already had a "Graylink" cable to connect the TI82 Stats.fr calculator to my PC and exchange programs between the emulator and calculator.
But I didn't have the cable to connect the two TI82 Stats.fr to each other...
After some research, I found this cable on several merchant sites at a price varying between 15 and 35 Euros...
Then I discovered this cable sold with a TI83 Plus.fr with which was also supplied a "SilverLink" cable, a booklet of 60 pages and the CD. All for 12 euros!
I did not hesitate! And so I acquired my third TI graphic in French version.
There will therefore have been these 3 TI graphics calculators produced in French version :

the TI82 Stats.fr from 2006 (red),
the TI83 Plus.fr from 2008,
the TI82 Stats.fr from 2009 (black).

Followed by :

the TI76.fr from 2009,
the TI84 Pocket.fr from 2011,
the TI83 Plus.fr from 2013.

With my three TI graphing calculators, I finally satisfied an old fantasy that I had not yet been able to satisfy with my emulator and my TI58C : exchange programs and data between the emulator and calculators but also from calculator to calculator.
(For the TI58C, I do not despair! I know that other people, more competent than me, are working to resolve this problem.)



TI92 the unexpected... 

I had not considered looking into the TI92 which did not match my search criteria.
Then the opportunity, accompanied by a hint of curiosity, brought about the temptation to which I gave in.
A TI92 was therefore added to the oldest calculators ...
It was provided with
a 92+ module and its 244page documentation,
the User Manual of more than 500 pages.
So I'm going to have a lot of reading for my long winter evenings ...




and finally... 

Many more will be added...
Either because they are missing from my collection like the TI42 MBA (European version of the TI The MBA) or the TI68 from 1995 (made in China).
Either because I already had them but I tried and won very very low bids for calculators in perfect condition that I couldn't resist (TI57 LCD, TI60, TI55 II).
Either because they were sold complete in their original box at an unbeatable price (TI53, TI57 LCD).
Either because I liked them and they seemed interesting to test (TI82 Plus, Voyage 200).
And there I thought I had made the full turn of what I could have, except for the "missing" ones like the TI88 that I will never find.
Then I "stumbled upon" an article that spoke of calculators using, against all odds, direct algebraic notation: three Hewlett Packard !!!
The first two, the programmable HP 20S (Scientific) then its sister the HP 21S (Stat/Math), were followed by the most incongruous HP : the HP 35 which can be used in Polish notation but also in direct algebraic notation.
I succumbed to the three... which have been added to my Texas Instruments collection...
I had chosen to be "Texan" since my TI58C in 1980 and although I had worked on Hewlett Packard computers (HP3000 and HP_UX) for about ten years, I never thought I could acquire calculators HP...

