

The Programmables 

Texas Instruments was one of the first manufacturers to call its
electronic scientific calculators "electronic slide rules".
The first calculators performed only the four basic arithmetic
functions.
The Texas Instruments electronic calculators of the 1970s went beyond
these four arithmetic functions and provided much more mathematical,
statistical, etc. functionality by making these calculators real "slide
rules", but they were nonprogrammable machines!
The SR52, a calculator with magnetic cards and a connector for an
external printer, started the history of Texas Instruments
programmable calculators.

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The SR52 

Introduced in 1975, this calculator integrates a magnetic card reader, a
program memory of 224 steps with 20 data registers.
The calculator can be plugged into a PC100 thermal printer.
The SR52 is an important precursor in the history of programmable
calculators based on the AOS system.
It announces the lineage of the 58/59 futures.
Year 
Dimensions 
Display 
Registers 
Steps 
1975 
164x84x44mm 
LED 10+2 
20 
224 



The TI58 

Released at the same time as the TI59, the TI58 presents little
interest because, without magnetic card or constant memory, it
presents the major drawback of having to reintroduce the program
after each shutdown.
It has a maximum of 480 program steps and can
have up to 60 data registers depending on the step / register
distribution chosen. (the basic configuration is 30 registers and 240
program steps).
The TI58 has a connector allowing the use of a thermal printer.
A slot allows you to insert a memory module containing programs
constituting a thematic library (Maths, Navigation, Statistics...)
This module concept has made it possible to develop TI58 calculators
dedicated to specific applications for companies: Allianz, Agrippina,
Bossard, Chrysler, EDF, Lloyd ... and many others.
Year 
Dimensions 
Display 
Registers 
Steps 
1977 
162x81x37mm 
LED 10 (8+2) 
060 
4800 



The TI59 

Released at the same time as the TI58, the TI59 has many additional advantages
things in common with her sister.
It also has a connector to plug into a thermal printer and
of a dwelling to introduce a memory module containing programs constituting
a thematic library (Maths, Navigation, Statistics ...) but in addition it has a card reader
Magnets for recording programs and data.
In addition, it has a maximum of 960 program steps and can have up to 100 registers.
of data according to the chosen step / register distribution.
A real gem at the time!
The only drawback is that the price of around 2000 French francs corresponds to 2 months of basic salary.
(Cost to which must be added the price of the printer and any modules)
Year 
Dimensions 
Display 
Registers 
Steps 
1977 
162x81x37mm 
LED 10 (8+2) 
0100 
960160 



The TI58C 

New version of the TI58, the TI58C has a constant memory (the C of TI58C).
The major drawback of the TI58 has been eliminated!
(See page The TI58C)
Year 
Dimensions 
Display 
Registers 
Steps 
1978 
162x81x37mm 
LED 10 (8+2) 
060 
4800 



The TI88 

Announced as the successor of the TI58C / TI59, the TI88 was to be released at the end of 1982.
Everything was ready ... Various preversions released for testing,
printed manuals and business brochures ready with announcements made on
salons ... Then abandonment ... For no reason?
Many will be advanced : either excessive cost, either internal Texas Instruments problems,
or competition from HP, Sharp... machines.
Who will one day know ?
Year 
Dimensions 
Display 
Registers 
Steps 
1982 
157x85x41mm 
LCD 10 (8+2) 
0120 
9600 



The TI66 

Texas Instruments introduced the TI66 Programmable in 1983 as a successor to the legendary TI58 and TI59 calculators.
In fact, the TI66 is absolutely not comparable to the TI59 but is closer to the TI58C, the last model of the 58/59 family.
It has a constant memory of 512 program steps and a maximum of 64 data registers depending on the partitioning chosen.
The TI66 Programmable was the first horizontal (landscape orientation) Texas Instruments calculator and later has inspired the Galaxy range of calculators.
This programmable TI66 was manufactured by Toshiba in Japan.
A PC200 printer can be connected but there are no preprogrammed modules like the TI58/58C/59.
Year 
Dimensions 
Display 
Registers 
Steps 
1983 
86x145x15mm 
LCD 10 (8+2) 
064 
5120 



The TI95 

The TI95 Procalc introduced in 1986 is a powerful and impressive programmable calculator.
It has 7200 program steps and 900 data registers depending on the partitioning chosen.
It can receive an additional RAM (8k) or ROM memory module.
The available ROM modules (Mathematics, Statistics, Chemical Engineering) are reminiscent of the TI58/59 modules ...
A PC324 printer can be connected as well as an interface allowing the connection of a cassette tape recorder.
The TI95 Procalc is a real gem ... unfortunately arrived a bit late!
6 years after the Sharp PC1211 (Tandy TRS80 PC),
5 years after the Casio FX702P,
but especially well after the HP41C (1979), HP41CV (1980), HP41CX (1984)!
And graphing calculators are coming ...
Year 
Dimensions 
Display 
Registers 
Steps 
1986 
96x204x25mm 
LCD 16 (10+2) 
0900 
72000 




The SR56 

The SR56, a programmable scientific calculator, came out after the SR52 and cost much less.
And for good reason...
It did not include a magnetic card reader and its memory was much smaller: a program memory of 100 steps with 10 data registers.
This calculator was the precursore of the TI57 lineage...
Year 
Dimensions 
Display 
Registers 
Steps 
1976 
147x81x32mm 
LED 10+2 
10 
100 



The TI57 

Released at the same time as the TI58 and TI59, the TI57 was the lowbudget programmable calculator of that era and replaced the SR56.
A difference with its big sisters, TI58 and TI59, is the "compression" of code in the program steps: [STO] [1] takes a single program step compared to 2 for a TI58/59.
The calculator is commercially "sold" as a result: its 50 program memory steps would be equivalent to 150 steps on another calculator ... (the ratio of 3 being very exaggerated!)
Certainly [INV] [2nd] [PRD] [2] costs only one step, but an example case does not make the general rule.
Like the TI58, the TI57 does not have a magnetic card reader and does not have constant memory, but with only 50 program steps and only 8 data registers the inconvenience is less.
The TI57 remains a good little programmable that has delighted many users.
The TI57 was also sold under the brand Radio Shack (EC4000) and, in Hungary, under the brand Híradástechnika (PTK1050).
Year 
Dimensions 
Display 
Registers 
Steps 
1977 
148x78x36mm 
LED 8+2 
8 
50 



The TI57 LCD 

The TI57 LCD is one of the line of slanted calculators introduced with the TI55 II in 1981.
A nice presentation, thinner than the TI57, with an LCD screen with a small line of indicators (2nd, INV, Rad...), a keyboard with 45 keys (instead of 40) and constant memory.
But...
a drastic reduction in overall memory (steps + registers),
performance largely below the TI57.
What a pity !
The bride was too beautiful...
Year 
Dimensions 
Display 
Registers 
Steps 
1982 
147x79x23mm 
LCD 8+2 
18 
480 



The TI57 II 

The keyboard of the first generation of "slanted" calculators was a disaster.
After some time of use, the keys malfunctioned or bounced.
Texas Instruments has decided to review the keyboard technology of the previous machines (TI55 II, TI57 LCD, BA55, ...) by adopting a new more reliable technology with new machines (TI55 III, TI57 II, BA54, ....).
So apart from the operation of the keyboard, there is no major difference between the TI57 LCD and its replacement, the TI57 II.
Year 
Dimensions 
Display 
Registers 
Steps 
1985 
147x72x22mm 
LCD 8+2 
17 
480 



The TI62 Galaxy 

The TI62 is actually a much improved version of the TI57 LCD and TI57 II correcting the shortcomings of these models.
To start with: more memory, programs can have up to 100 steps, if all but one of the data registers are converted to program usage.
Conversely, a 42step program can coexist with 10 data registers.
Then there is a larger display which is used to show the program steps in alphabetical mnemonic form, it displays 10 digit numbers with a two digit exponent.
The keyboard is also a big improvement: the TI57 LCD had that horribly stiff, bouncy keyboard that Texas Instruments used in many of their early LCD calculators. (This was fixed with the release of the TI57 II, but the TI62's "Galaxy" style keyboard is even better.)
The TI62 is a very interesting and beautiful machine.
Year 
Dimensions 
Display 
Registers 
Steps 
1986 
89x145x20mm 
LCD 10+2 
110 
10042 



The TI55 

The TI55, released the same year as the MBA and the TI57, has the same physique as them (although the MBA is denoted by its colors and graphics) but the TI55 stands out more for its statistical functions than for its programmatic qualities.
Its programmability is comparable to that of the MBA since, in addition to a program size limited to 32 steps, it is not possible to use branching instructions other than the classic RST as on the MBA.
Note the presence of a factorial function and conversion functions of Imperial units / metric units.
Year 
Dimensions 
Display 
Registers 
Steps 
1977 
148 x 78 x 36 mm 
LED 8+2 
10 
32 



The TI51 III 

The TI51 III is the European version of the TI55.
She was marketed in France under the name of powerful scientific and complete statistician.
Year 
Dimensions 
Display 
Registers 
Steps 
1977 
148 x 78 x 36 mm 
LED 8+2 
10 
32 



The TI53 (Slimline) 

We should have been wary of this TI53.
In the generation of "Slimline" calculators, the TI53 was the only one presented as programmable.
With a single data memory and 32 program steps and the impossibility use branching instructions other than the classic RST, the TI53 is possibly the worst "supposedly programmable" that Texas Instruments has produced.
What makes its charm : to be as "Slimline" inside (in all its possibilities!) as outside!
Year 
Dimensions 
Display 
Registers 
Steps 
1978 
134 x 74 x 9 mm 
LCD 8 (5+2) 
1 
32 



The TI55 II 

With the TI55 II, Texas Instruments starts the generation of "Slanted" calculators.
This calculator offered a larger screen than the previous generation "Slimline" calculators with an LCD display of 8 digits + 2 instead of 5 + 2.
Although its partitioning allows for up to 56 program steps, the TI55 II actually has less memory than the TI55.
But its worst flaw will be its keyboard... (same problem as the first generation "Slanted" calculators: TI57 LCD, BA55 ...)
Year 
Dimensions 
Display 
Registers 
Steps 
1981 
147 x 79 x 23 mm 
LCD 8+2 
18 
560 



The TI53 (Slanted) 

It seemed that Texas Instruments had done the worst with the TI53 "slimline" (slimline).
But with this new TI53 version "Slanted" (tilted) Texas Instruments broke the record:
the word "PROGRAMMABLE" has been added (in all capitals!).
Year 
Dimensions 
Display 
Registers 
Steps 
1986 
147 x 72 x 22 mm 
LCD 8 (5+2) 
1 
32 



The TI55 III 

The TI55 III is also a replacement calculator like the BA54, TI55 II...
Due to the disaster of the keyboards of the first "Slanted" calculators, the TI55 II had to be replaced.
The only difference, besides the keyboard, between the TI55 II and the TI55 III is aesthetic: the TI55 III it is much more sober and to some it seems less attractive.
Otherwise from the point of view of functionality, they are the same calculators.
Year 
Dimensions 
Display 
Registers 
Steps 
1986 
147 x 72 x 22 mm 
LCD 8+2 
18 
560 



The TI56 

The TI56 is just the European version of the TI55 III!
Nothing more, nothing less...
Year 
Dimensions 
Display 
Registers 
Steps 
1986 
147 x 72 x 22 mm 
LCD 8+2 
18 
560 



The MBA 

The calculator called "The MBA" (in the United States) is equipped with advanced financial and statistical functions and initiates the range of "Business Analyst" calculators.
Programmability is extremely light because, in addition to a program size limited to 32 steps, it is not possible to use other branching instructions than the classic RST.
The look of this calculator "The MBA" remains one of the most recognizable with surprising colors and the title of the calculator written in Gothic Italic.
Visually, it is not possible to confuse it with a TI55 or a TI57...
Year 
Dimensions 
Display 
Registers 
Steps 
1977 
148 x 78 x 36 mm 
LED 10 (8+2) 
812 
320 



The TI42 MBA 

The TI42 MBA is quite simply the European version of the "The MBA" calculator released a year earlier in the United States.
Why this name for Europeans ???
Year 
Dimensions 
Display 
Registers 
Steps 
1978 
148 x 78 x 36 mm 
LED 10 (8+2) 
812 
320 



The BA55 

The BA55 is a "Business Analyst" calculator with very limited programming capability without any branching instructions and only 40 maximum program steps.
Trigonometric functions have disappeared to make way for financial functions.
The BA55 has a printer connector identical to the TI66 for connecting a PC200 Printer for which the Adv, List, Print and Trace instructions are present.
It is surprising to find such functionality on a calculator with such poor programmability.
Year 
Dimensions 
Display 
Registers 
Steps 
1983 
147 x 79 x 23 mm 
LCD 8 (5+2) 
05 
400 



The BA54 

The BA54 is a replacement calculator. As were also the TI55 III, TI57 II...
Indeed, the keyboards of the first "Slanted" calculators were a disaster.
The technology of the keyboards of these previous machines (TI55 II, TI57 LCD, BA55, ...) was therefore reviewed by Texas Instruments which released the new machines (TI55 III, TI57 II , BA54, ....).
In passing, the BA54 lost the BA55 printer connector (and the Adv, List, Print and Trace instructions).
Year 
Dimensions 
Display 
Registers 
Steps 
1986 
147 x 72 x 22 mm 
LCD 8 (5+2) 
05 
400 



The TI65 

The first impression facing the TI65 is weird ... the colors, the shape, the 2nd key brown and the 3rd blue ...
No Enter key, so it is indeed an TI !
A surprisingly interesting calculator, this TI65.
Its shape is reminiscent of other calculators in the "Galaxy" series, such as the TI62.
Approximately the same number of steps and number of registers ...
The same compact programming with key sequences counting for a single program memory step: therefore a fairly satisfactory program memory size (100 program steps).
The calculator has many programming features:
conditional branching,
the labels,
the subprograms,
a DSZ loop statement,
...
But the most surprising feature on a TI programmable calculator is the stopwatch per second which is managed using the TUp or TDn instructions.
Is the TI65 the successor to the TI62?
Or does it presage the lineage of the TI68, TI60, TI60X ...?
In any case, it raises many questions !
Year 
Dimensions 
Display 
Registers 
Steps 
1987 
89x145x20mm 
LCD 10+2 
116 
1000 



The TI68 

The TI68 is one of the programmable ones since it is possible to enter a sequence of instructions and then execute it.
It is even possible to enter several programs (up to 26!).
But it would be better to speak of "formulas" rather than programs.
Indeed, there are no branching instructions and calling another program (formula?) is impossible.
Although it has 55 data registers and 440 program steps, the TI68 only allows you to enter formulas with a maximum of 79 steps each...
No branching, no loop, no condition, no possibility of calling a second program from a first and a severe limitation to 79 steps make this calculator a "not really" programmable.
Despite everything, with its EOS system (Equation Operating System), its multiple functions and its general philosophy, this TI68 promises to be the precursor of the future TI67 much more interesting.
Year 
Dimensions 
Display 
Registers 
Steps 
1989 
150 x 74 x 15 mm 
LCD 12 (8+2) 
055 
4400 



The TI60 

The TI60 is a black calculator in the aesthetic line of "slanted".
Despite many unusual functions (conversions of imperial units (gal, lb, in) into metric units (l, kg, cm), use of hexadecimal and octal ...) and many other more conventional for a "scientist" (statistics, integration, ...) this TI60 is a little weak for the programming aspect: a maximum of 84 program steps and no connection instructions.
Partitioning is done by mentioning the number of registers desired in hexadecimal (from 1 to C):
2nd
Part
1
for 1 data register and 84 program steps,
2nd
Part
C
for 12 data registers and 7 program steps.
Another "almost" programmable ...
Year 
Dimensions 
Display 
Registers 
Steps 
1990 
147 x 72 x 22 mm 
LCD 10 (7+2) 
112 
847 



The TI60X 

Its name, TI60X, might make it seem like an improved TI60. It is not so !
In reality the TI60X is a TI68 with less memory and a coarser LCD display: each character is on a 5x4 dot matrix instead of 7x5 dots for the TI68, which results in less fine characters but more readable.
Because of these criteria the TI60X is nicknamed the "TI68 light".
Like the TI68, the TI60X does not really record programs but rather formulas (12 max).
Strangely, the alphabet is therefore limited to 12 characters (A, B, C, D, E, F, G, H, I, X, Y and Z) allowing formulas to be named.
Year 
Dimensions 
Display 
Registers 
Steps 
1991 
150 x 74 x 15 mm 
LCD 12 
112 
968 



The TI67 

The TI67 is a full plastic black and gray "Galaxy" with rubber keys.
It closes by sliding into a lid like a drawer.
The programs, whose size is calculated in bytes, are written on one line, the instructions being separated by the character ":" (colon).
The language based on the EOS system (Equation Operating System) is a mixture of SML (Specialized Machine Language) and a pseudo "TI Basic" and can include alphanumeric labels (lbl), conditional (if) and unconditional (goto) branches.
The TI67 has 90 memories and 1536 bytes available for programs.
The many functions: mathematics, statistics, formulas, sequences ... and the programming methods make it a real programmable scientific calculator.
It only lacks the possibility of being able to connect a printer and to be able to record the programs on an external medium.
Year 
Dimensions 
Display 
Registers 
Bytes 
1992 
87 x 140 x 17 mm 
LCD 10 (8+2) 
090 
15360 



Graphing calculators... 
From 1990, graphing calculators will take power ...









TI81 
TI85 
TI82 
TI80 
TI83 
TI86 
TI73 
TI89 
... 
(1990) 
(1992) 
(1993) 
(1995) 
(1996) 
(1997) 
(1998) 
(1998) 




Summary 

Year 
Dimensions 
Line 
Battery 
Display 
Precision 
Registers 
Steps 
BA54  1986  147 x 72 x 22 mm  Slanted  2xLR44  LCD 8 (5+2)  11  05  400 
BA55  1983  147 x 79 x 23 mm  Slanted  2xLR44  LCD 8 (5+2)  11  05  400 
SR52  1975  164 x 84 x 44 mm  Classic Gen2  BP1A  LED 10+2  12/13  20  224 
SR56  1976  147 x 81 x 32 mm  Classic Gen2  BP1A  LED 10+2  12  10  100 
The MBA  1977  148 x 78 x 36 mm  Majestic  BP7  LED 10 (8+2)  11  812  320 
TI42 MBA  1978  148 x 78 x 36 mm  Majestic  BP7  LED 10 (8+2)  11  812  320 
TI51 III  1977  148 x 78 x 36 mm  Majestic  BP7  LED 8+2  11  10  32 
TI53  1978  134 x 74 x 9 mm  Slimline  2xLR44  LCD 8 (5+2)  11  1  32 
TI53  1986  147 x 72 x 22 mm  Slanted  2xLR44  LCD 8 (5+2)  11  1  32 
TI55  1977  148 x 78 x 36 mm  Majestic  BP7  LED 8+2  11  10  32 
TI55 II  1981  147 x 79 x 23 mm  Slanted  2xLR44  LCD 8+2  11  18  560 
TI55 III  1986  147 x 72 x 22 mm  Slanted  2xLR44  LCD 8+2  11  18  560 
TI56  1986  147 x 72 x 22 mm  Slanted  2xLR44  LCD 8+2  11  18  560 
TI57  1977  148 x 78 x 36 mm  Majestic  BP7  LED 8+2  11  8  50 
TI57 II  1985  147 x 72 x 22 mm  Slanted  2xLR44  LCD 8+2  11  17  480 
TI57 LCD  1982  147 x 79 x 23 mm  Slanted  2xLR44  LCD 8+2  11  18  480 
TI58C  1978  162 x 81 x 37 mm  TI58/59 Serie  BP1A  LED 10 (8+2)  13  060  4800 
TI58  1977  162 x 81 x 37 mm  TI58/59 Serie  BP1A  LED 10 (8+2)  13  060  4800 
TI59  1977  162 x 81 x 37 mm  TI58/59 Serie  BP1A  LED 10 (8+2)  13  0100  960160 
TI60  1990  147 x 72 x 22 mm  Slanted  2xLR44  LCD 10 (7+2)  13  112  847 
TI60X  1991  150 x 74 x 15 mm  60  CR2032  LCD 12  13  112  968 
TI62  1986  89 x 145 x 20 mm  Galaxy  2xLR44  LCD 10+2  13  110  10042 
TI65  1987  89 x 145 x 20 mm  Galaxy  2xLR44  LCD 10+2  13  116  1000 
TI66  1983  86 x 145 x 15 mm  Galaxy  2xLR44  LCD 10 (8+2)  13  064  5120 
TI67  1992  87 x 140 x 17 mm  Galaxy  2xLR44  LCD 10 (8+2)  13  090  15360 
TI68  1989  150 x 74 x 15 mm  60  CR2032  LCD 12 (8+2)  13  055  4400 
TI88  1982  157 x 85 x 41 mm   BP88  LCD 10 (8+2)  13  0120  9600 
TI95  1986  96 x 204 x 25 mm  Procalc  4xLR3  LCD 16 (10+2)  13  0900  72000 
