TI CALCULATOR HISTORY
1972-1980
(since April 22, 1997)
Last Update: October 02, 2021 -- THE CURTA REFERENCE
TI invents the world’s first handheld electronic calculator.
While small enough to fit into the palm of a hand, the Cal-Tech is powerful enough to perform basic math functions.
TI’s first handheld calculator hits the retail market.
The revolutionary technology of the single-chip TI-2500 Datamath™ calculator makes everyday math accessible. Capable of performing addition, subtraction, multiplication and division, it features a red, eight-digit LED display.
TI’s first slide rule calculator.
The SR-10 featured a square root and exponential notation.
Calculator-1972-TI-SR10-Pocket-LED-Calculator-Slide-Rule-Calculator-14592862578_11250c552c_o-tn.jpg
TI introduces its first scientific calculator.
The TI SR-50 adds trigonometric and hyperbolic functions to the technology available on the TI-2500 Datamath™ calculator, as well as logarithms and their inverses.
SR-10 - 1st
FUNCTIONS: Four w/Exponent, square root, square, reciprocal
MEMORIES: None
DISPLAY: 12 LEDs
KEYBOARD: 23 buttons
SWITCHES: Top Right On/Off
BATTERIES: 3-AA NiCads (internal)
PHYSICAL: 6.3" x 3.1" x 1.5"
WEIGHT: 10 ounces
PRODUCTION: 1972
COST: $149.95
INFO: o The "SR-10" logo is situated in the escutcheon
surrounding the display.
o TI's first "SR" (Slide Rule) model.
o This was a big hefty unit. Hardly hand-held.
* SR-10 - 2nd
FUNCTIONS: Four w/Exponent, square root, square, reciprocal
MEMORIES: None
DISPLAY: 12 LEDs
KEYBOARD: 23 buttons
SWITCHES: Top Right On/Off
BATTERIES: 3-AA NiCads (internal)
PHYSICAL: 6.3" x 3.1" x 1.5"
WEIGHT: 10 ounces
PRODUCTION: 1973
COST: $89.99
INFO: o The "SR-10" logo is situated in the upper area of
the faceplate.
* SR-11
FUNCTIONS: Four w/Exponent, square root, square, reciprocal and pi
MEMORIES: None
DISPLAY: 12 LEDs
KEYBOARD: 24 buttons
SWITCHES: Top Right On/Off
Top Right keyboard Constant
BATTERIES: 3-AA NiCads (internal)
PHYSICAL: 6.3" x 3.1" x 1.5"
WEIGHT: 9 ounces
PRODUCTION: Announced September 11, 1973
COST: $119.95 intitially, $79.95 later
INFO: o The Sr-11 was like the SR-10, but with pi and a constant.
o Much less hefty than the SR-10.
TI-15
FUNCTIONS: Four plus 1/X, X*X, Square Root of X, Pi
MEMORIES: 1
DISPLAY: 8 LEDs
KEYBOARD: 40 buttons
SWITCHES: None
BATTERIES: ~9 volt
PHYSICAL: ~5.8" x 3.2" x 1.4"
WEIGHT: ~5.74 ounces
PRODUCTION: 1978
AVAILABLE: German model
INFO: o Info from Thomas Brockmeier
SR-16
FUNCTIONS: Scientific
MEMORIES: 1
DISPLAY: 12 LEDs
KEYBOARD: 31 buttons
SWITCHES: Top Right On/Off
BATTERIES:
PHYSICAL: 6.3" x 3.1" x 1.5"
WEIGHT: 8.3 ounces
PRODUCTION: Introduced on October 25, 1974
COST: $99.95
INFO: o The SR-16 was a Scientific calculator.
o Superseded by the SR-16II within a year.
* SR-16 II
FUNCTIONS: Scientific:
x^2, sqrt(x), 1/x, y^x, e^x, LNx, Log, One memory
register with store, recall, and sum.
MEMORIES: 1
DISPLAY: 12 LEDs
KEYBOARD: 31 buttons
SWITCHES: Top Right On/Off
BATTERIES: 3-AA NiCads
PHYSICAL: 5.8" x 3.2" x 1.3"
WEIGHT: 8.25 ounces
PRODUCTION: Introduced on August 1, 1975
COST: $49.95
INFO: o Possibly the last TI slide rule calculator that did
not have trig functions.
SR-20
AC only version of the SR-22
SR-20 was a slightly advanced desktop calculator.
It had an x! key.
SR-22
FUNCTIONS: Four plus octal, decimal and hexadecimal conversion
MEMORIES:
DISPLAY: 12 neon gas discharge display (10 + 2)
KEYBOARD: 34 buttons
SWITCHES: Right Side On/Off
Left-Center of Keyboard AUTO/MAN Base Change
BATTERIES:
PHYSICAL: 9.0" x 6.5" x 2.75"
WEIGHT:
PRODUCTION: Announced on September 11, 1973
COST: $350 plus $50 for the battery pack
INFO: o The SR-22 hexadecimal calculator, It converts between
octal, decimal and hexadecimal.
o There are 3 LEDs in the keypad area which light to
indicate which base you are working in.
o A very unique feature is that these conversions are
performed on floating-point numbers, not integers.
o For example decimal 2.5 converts to 2.8 in hexadecimal
and 2.4 in octal. (from Mike Sebastian)
o The conversions are very slow, like several seconds.
o Its color scheme was much like that of the SR-11, with
white, grey, blue, and orange keys.
o The ad text reads:
model SR-20 desk calculator with 14-character display has eight special
function keys--pi, epsilon, exponent, factorial. integral [integer portion
of x], square root, squaring, reciprocal, [$]179.95.
The key layout in the photo are
INT x pi e EE CD C
x^2 7 8 9 x / [divide]
\/x 4 5 6 + -
x! 1 2 3 + -
1/x 0 . +/- = =
+, -, and = are double-size keys.
CD, C, and 1-9 are white; = is orange.
Keys on left and remainder on top row are blue.
All other keys are grey.
from Jeff Woolsey <woolsey@jlw.com>
TI 25
Functions: Scientific
Memories: 1
Display: 9 LCDs (8 + 1 or 5 + 2 + 2)
Keybord: 40 buttons
Switches: None (Key 4 = OFF, Key 5 = ON/C)
Batteries: 2 Silveroxid (3 V)
Pysical: 5.2" x 3.0" x 0.4"
Weight: 80 g
Production: 1978
cost: 75 DM in Germany
INFO: can almost the same as the TI 30, but has no hyperbolic
functions, therefore 1 dim statistic
totally black body
fixed in a map like the typical Japanese calculator
* TI-30
FUNCTIONS: Scientific
MEMORIES: 1
DISPLAY: 8 LEDs
KEYBOARD: 40 buttons
SWITCHES: None
BATTERIES: 9 volt
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 5.25 ounces
PRODUCTION: 1976
COST: $24.95
INFO: o The best selling calculator ever.
TI-31
FUNCTIONS: Scientific
MEMORIES: 1
DISPLAY: 12 LEDs
KEYBOARD: 40 buttons
SWITCHES: None
BATTERIES: ~9 volt
PHYSICAL: ~5.8" x 3.2" x 1.4"
WEIGHT: ~5.74 ounces
PRODUCTION: 1978
AVAILABLE:
INFO: o Info from Thomas Brockmeier
TI-33
FUNCTIONS: Scientific
MEMORIES: 3 (thanks Andre from Wuppertal, Germany)
DISPLAY: 8 LEDs
KEYBOARD: 40 buttons
SWITCHES: None
BATTERIES: ~9 volt
PHYSICAL: ~5.8" x 3.2" x 1.4"
WEIGHT: ~5.74 ounces
PRODUCTION: 1978
AVAILABLE:
INFO: o Info from Thomas Brockmeier
TI-38
Constant Memory (in beautiful black, I remember there was
another color, maybe silver) was made in Italy, the number is 4179 PCI,
so perhaps the correct year might be 1979.
from Achim (alewand@forwiss.uni-erlangen.de)
* SR-40
FUNCTIONS: Scientific
MEMORIES: 1
DISPLAY: 12 LEDs
KEYBOARD: 40 buttons
SWITCHES: None
BATTERIES: 2-AA NiCads to 9 volt
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 5.74 ounces
PRODUCTION: 1976
AVAILABLE: Easy
INFO:
TI-41
FUNCTIONS: Scientific
MEMORIES: 1
DISPLAY: 12 LEDs
KEYBOARD: 40 buttons
SWITCHES: None
BATTERIES: 2-AA NiCads to 9 volt
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: ~5.74 ounces
PRODUCTION: 1978
AVAILABLE:
INFO: o Info from Thomas Brockmeier
TI-42 MBA
FUNCTIONS: Scientific/Business
MEMORIES: 1
DISPLAY: 8 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
BATTERIES: ~2-AA NiCads to 9 volt
PHYSICAL: ~5.8" x 3.2" x 1.4"
WEIGHT: ~5.74 ounces
PRODUCTION: 1978
AVAILABLE:
INFO: o Info from Thomas Brockmeier
TI-45
FUNCTIONS: Scientific
MEMORIES: 1
DISPLAY: 9-digit fluorescent blue-green display (not ~12 LEDs)
KEYBOARD: 40 buttons
SWITCHES: None
BATTERIES: ~2-AA NiCads to 9 volt
PHYSICAL: ~5.8" x 3.2" x 1.4"
WEIGHT: ~5.74 ounces
PRODUCTION: 1978
AVAILABLE:
INFO: o Info from Thomas Brockmeier
o Jan Kronlund from Finland has a TI-45 with a blue
electrolumicent display
Jens-Eike Hartwig (j-e_hartwig@t-online.de) used a
TI-45 in 1978 (at school, 8th grade).
Has a 9-digit fluorescent green display (8 digits + sign/DRG-symbols)
o Per Hilton from Asker, Norway
Display is not LED, but VFD (Vacuum Fluorescent), 9 digits.
Same functions as TI-30, but no power-saving "walking dot" mode
(just turns off after around 7 minutes).
Chip is TMC1983NL, display Itron FG95B1.
Power consumption (9V) is 25uA when off, 14-15mA when on
(vs. 40-60mA for TI-30).
* SR-50
FUNCTIONS: Scientific:
x^2, sqrt(x), 1/x, %, y^x, x root y, factorial, trig,
hyperbolic trig functions, e^x, LNx, Log, Degrees to
Radian conversion and vice versa, degree/radians switch,
One memory register with store, recall, and sum.
MEMORIES: 1
DISPLAY: 14 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
Top Left Radians/Degrees
BATTERIES: 3-AA NiCads
PHYSICAL: 5.8" x 3.2" x 1.3"
WEIGHT:
PRODUCTION: Announced on January 15, 1974
COST: $169.95
INFO: o The first SR-50 was first marketed by direct mail.
o Like the SR-11, this machine has brightly colored blue,
orange, and gray keys, along with white for digit entry.
o Also has a silver area that comes down below the first
row of keys.
o It also marks the start of Texas Instruments assault on
the HP slide rule calculators.
* SR-50A
FUNCTIONS: Scientific: Same as the SR-50
MEMORIES: 1
DISPLAY: 14 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
BATTERIES: 3-AA NiCads
PHYSICAL: 6.0" x 3.2" x 1.3"
WEIGHT: 8.25 ounces
PRODUCTION: 1975
COST: $109.50
INFO: o This model was introduced to standardize this model with
the SR-52, SR-56, SR-51A to reduce costs.
o It also has a more business-like case/key color scheme.
o Kind of bland compared to the SR-50.
o This machine possibly works with the PC-100 series
printers.
o TI-50 Simline LCD serise replaced this popular LED version
* SR-51
FUNCTIONS: Scientific and Financial:
x^2, sqrt(x), 1/x, y^x, x root y, factorial, permutations,
mean, variance, std deviation, Linear regression with
trend line projection, random number generator, trig,
hyperbolic trig functions, e^x, LNx, Log, 10^x, %,
% change, 20 different conversions, degree/radians switch,
Three memory registers with full register arithmetic.
MEMORIES: 3
DISPLAY: 14 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
Top Left Radians/Degrees
BATTERIES: 3-AA NiCads
PHYSICAL: 6.0" x 3.2" x 1.3"
WEIGHT: 8.25 ounces
PRODUCTION: Introduced about March of 1975
COST: $224.95
INFO: o TI replaced the SR-50 and SR-51 in mid-1975 with
the "A" models.
o The SR-51 had been marketed only a few months when
this happened, so it's quite rare.
o This calculator is also more stylish than any of
TI's other advanced models.
o First machine to offer permutations and a built-in
random number generator.
o First TI to allow FIX decimal point?
o This machine also had bright colors like the SR-50.
SR-51A
FUNCTIONS: Scientific and Financial
MEMORIES: 3
DISPLAY: 14 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
Top Left Radians/Degrees
BATTERIES: 3-AA NiCads
PHYSICAL: 5.8" x 3.2" x 1.3"
WEIGHT: 8.3 ounces
PRODUCTION: Introduced about March of 1975
COST: $224.95
INFO: o This model was introduced to standardize this model
with the SR-52, SR-56, SR-50A to reduce costs.
o It also has a more business-like case/key color scheme.
o Kind of bland compared to the SR-51.
o This machine possibly works with the PC-100 series
printers.
* SR-51-II
FUNCTIONS: Scientific and Financial
MEMORIES: 3
DISPLAY: 12 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
BATTERIES: 2-AA NiCads to 9 volt
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 7.5 ounces
PRODUCTION: 1976
COST: $80.00
INFO:
* TI-51-III
FUNCTIONS: Scientific and Financial and Programmable
MEMORIES: 10
PRGM STEPS: 32 (and 8 Memories) or 24 (9) or 16 (8)
DISPLAY: 12 LEDs (8+2+2)
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
BATTERIES: 2-AA NiCads to 9 volt
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 6.25 ounces
PRODUCTION: 1976
COST: $80.00
INFO: o Programmable
o Successor of the SR 51 II
o Same body as TI 57
o 2 dim statistic with keys for correlation, slope, zero-point, x and y
o Value convert inch to mm, gal to l, lb to kg, F to C
o Only rudimentary programmable, therefore programmable functions (R/S,
Rst, Lrn, Sst) covers 2nd keys and branches, pause or even backstep
doesn't exist.
from Albert Rupprecht <es9j4@yahoo.com>
I bought a TI 51 III in spring 1980 because at the age of 13 I didn't
no the difference to the TI 57. So I thought with more 2nd function
keys it's the better calculator. TI 51 III and TI 57 had the same
body, therefore I suppose both were introduced at the same time and
started with a anodised legend witch later became a plastic relief
(like my model). The manual's handbook copyright is from 1977 and my
model looks like the one on your TI 55 photo - so the TI 55 possible
called TI 51 III in Germany (by the way: I can't remember a TI 55). I
would talk about a scientific and statistic calculator because it
hasn't got any financial functions! Unlike the TI 57 it doesn't carry
the letters "Programmable" because it hasn't got X=T, X>=T, Label, SBR
or even BST! For having a Pause the manuel suggests using 10 times "="
then you can see the result flickering!
But - that must be said - it calculated well, much better as the TI 55
II from 1982 I bought next. This model was so worse that I though it
away at last! First I discover a disastrous round mistake (by convert
DMS to DD) and then using the keys was impossible - the display show
either nothing or too much of the same numbers - like so many TI
calculators of this time.
About the other calculators I don't know much, but the TI 57 had 50
(not 150) steps and the TI 58 480 and no memories or 8 less per
memory! Also the TI 59 (960 - 100 to 120 - 0). You shout mentioned
that the magnetic card reader was integrated and - this was very
clever and useful - the card's backside could be used as labels for
the softkeys A to E!.
Surly also worth to mention: The TI 30 wrote "Error" with its display.
And the 3 to 9 V battery pack didn't offer a overcharge-protection, so
the user could destroy the pills very easily.
And TI sold the models TI 25 and TI 53 in Germany - they had perhaps
another name in the USA! These LCD-models existed already in early
1979, so they might came out in autumn 1978:
* SR-52
FUNCTIONS: Scientific and Programmable:
224 program steps, Card reader, 20 memories (see below),
full log, trig, and algebraic functions. Program steps
are completely unmerged. To store a number into memory 1
requires 3 steps. STO, 0, 1.
MEMORIES: 20
PRGM STEPS: 224
STORAGE: 2 7/8-inch by 5/8-inch magnetic cards
DISPLAY: 14 LEDs
KEYBOARD: 45 buttons
SWITCHES: Top Right On/Off
Top Left Redians/Degrees
BATTERIES:
PHYSICAL:
WEIGHT: 12.3 ounces
PRODUCTION: Introduced September 16, 1975
COST: $395
INFO: o The SR-52 was an early and popular programmable
scientific calculator.
o An optional printer, the PC-100, was introduced
January 7, 1976.
o First TI programmable, First programmable to offer
Indirect addressing (Which I think was a big
milestone), and to branch on an error?,
first TI with AOS and parentheses,
o Thickest TI ever made.
o Sure uses the INV key a lot.
o This machine had a few goodies built-in to it that
many people did not know about.
--Memories 98 and 99 were full memories in
addition to the 00-19 memories.
--Also, storing into memory locations 70 and
above stored into program memory.
--Storing into memories 60-69 affects pending
operations stack. You could get a total of
over 50 memories on this machine.
o Case design is similar to the SR-50A, 51A, and 56.
TI 53
FUNCTIONS: Scientific and Programmable
MEMORIES: 1 (I'm not sure!!!)
PRGM STEPS: 32
DISPLAY: 9 LCDs (8 + 1 or 5 + 2 + 2)
KEYBOARD: 40 buttons
SWITCHES: None (Key 4 = OFF, Key 5 = ON/C)
BATTERIES: 2 Silveroxid (3 V)
PHYSICAL: 5.2" x 3.0" x 0.4"
WEIGHT: I suppose 80 g
PRODUCTION: 1978
COST: ?
INFO: Constant Memory, same body as TI 25 but in silver
no statistic functions
only rudimentary programmable, programmable keys
are R/S, Rst, Lrn, SST fixed in a map
TI-54
Exists -- Need info
* TI-55
FUNCTIONS: Scientific and Programmable
MEMORIES: 10
DISPLAY: 12 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
BATTERIES: 2-AA NiCad to 9 volt
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 6.5 ounces
PRODUCTION: 1977
COST:
INFO: o Budget scientific model.
TI-55II
scientific slimline w/angled LCD display
SR-56
FUNCTIONS: Scientific:
Full log, trig, and algebraic functions.
MEMORIES: 10
PRGM STEPS: 100
DISPLAY: 12 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
Top Left Gradent/Degrees
BATTERIES:
PHYSICAL: 5.8" x 3.2" x 1.3"
WEIGHT: 8.3 ounces
PRODUCTION: Announced on January 21, 1976
COST: $179.95
INFO: o Works with PC-100 and 100A printer.
o First TI key programmable.
o First TI since the SR-50 not to include factorial.
o First TI to include a Pause function.
o First programmable to use an independent test
register for branching?
SR-56 Programmable
FUNCTIONS: Scientific and Programmable
MEMORIES: 10
PRGM STEPS: 100
DISPLAY: 12 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
Top Left Gradent/Radians/Degrees
BATTERIES:
PHYSICAL: 5.8" x 3.2" x 1.3"
WEIGHT: 8.3 ounces
PRODUCTION:
COST: $139.00
INFO:
* TI-57 type 1
FUNCTIONS: Scientific and Programmable
MEMORIES: 8
PRGM STEPS: 150, Key programmable
DISPLAY: 12 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
BATTERIES: 2-AA NiCad to 9 volt
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 6.5 oz
PRODUCTION: Introduced on May 24, 1977
COST: $79.95
INFO: o The TI-57 superseded the SR-56.
o TI legend anodized on aluminum.
o Most people do not know that any TI-57 can be made
into a TI-57C by sacrificing the last two program
steps. Program memory is retained at little or no
battery drain, but unit is NOT switched off.
How?: At step 48 of your program memory, place the
following: 2nd Exc SST LBL 1. Press LRN. When you
want to switch your calculator off, press GTO 2nd
48, R/S, INV STO 3 +/- +/-. The display will go
blank. It uses even less energy than the TI-58C
to store programs this way. When you want to
switch the calculator back on, press INV FIX CLR.
Try it.
* TI-57 type 2
FUNCTIONS: Scientific and Programmable
MEMORIES: 8
PRGM STEPS: 150, Key programmable
DISPLAY: 12 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
BATTERIES: 2-AA NiCad to 9 volt
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 6.25 oz
PRODUCTION: Introduced on May 24, 1977
COST: $79.95
INFO: o The TI-57 superseded the SR-56.
o TI legend in plastic relief
* TI-58
FUNCTIONS: Scientific and Programmable
MEMORIES: 60
PRGM STEPS: 480, Key programmable
DISPLAY: 12 LEDs
KEYBOARD: 45 buttons
SWITCHES: Top Left On/Off
BATTERIES: 3-AA NiCads
PHYSICAL: 6.4" x 3.2" x 1.5"
WEIGHT: 8.5 ounces
PRODUCTION: Introduced on May 24, 1977
COST: $124.95
INFO: o Replaced with the 58C in 1979
o One of the last key programmables that lost
program memory when turned off. This significantly
lowers its value and usefulness.
o First machine to use ROM cartridges.
o This machine has the ability to run programs in
fast mode. Speeds execution by about 25%.
* TI-58C
FUNCTIONS: Scientific and Programmable
MEMORIES: 60 or
PRGM STEPS: 480, Key programmable.
DISPLAY: 12 LEDs
KEYBOARD: 45 buttons
SWITCHES: Top Left On/Off
BATTERIES:
PHYSICAL: 6.4" x 3.2" x 1.5"
WEIGHT: 8.5 ounces
PRODUCTION: 1979
COST:
INFO: o Model 58 with continuous memory.
o Works with PC-100A and 100C printer.
o Corrects the primary deficiency of the TI-58 in
that it remembers memory when turned off!
o First machine to use ROM cartridges. This machine has
the ability to run programs in fast mode. Speeds
execution by about 25%.
* TI-59
FUNCTIONS: Scientific and Programmable
MEMORIES: 100 or
PRGM STEPS: 960
STORAGE: Magnetic cards
DISPLAY: 12 LEDs
KEYBOARD: 45 buttons
SWITCHES: Top Left On/Off
BATTERIES: 2-AA NiCad
PHYSICAL: 6.4" x 3.2" x 1.5"
WEIGHT: 10 ounces
PRODUCTION: Introduced on May 24, 1977
COST: $299.95
INFO: o Modules containing programs with up to 5000 steps
were available for this calculator.
o A magnetic card reader was available.
o Surprisingly common, given its expense and
sophistication.
o Works with PC-100A and 100C printer.
o Largest memory capacity of ANY programmable until
HP-41C introduced.
o First machine to use ROM cartridges.
o Card readers on these units are notoriously unreliable.
o First machine to use ROM cartridges.
o This machine has the ability to run programs in fast
mode. Speeds execution by about 25%.
SR-60A (Scientific Desktop)
FUNCTIONS: Scientific
MEMORIES: 100
PRGM STEPS: 480/1920
DISPLAY: 20 LEDs
KEYBOARD: 95 keys
SWITCHES:
BATTERIES: AC power
PHYSICAL: Desktop
WEIGHT: ~26 lbs
PRODUCTION: 1976
COST: 1695.00
INFO: o Card Reader and Printer built in
o Desktop card programmable.
o Had over 2000 program steps when expanded and
prompted with alpha characters.
TI-88
Date Introduced: Never.
Price: N/A
Functions:
Info: o TI equivalent to the HP-95C!
o Biggest hyped vapor-calc ever.
o This was to be the TI response to the HP-41C.
o Had alpha, etc.
o Hyped to many TI-59 owners, but then withdrawn
without comment.
o Obviously very rare. If you ever find one, buy it.
from Arthur Hagen <art@broomstick.com>
Also, I'm one of the lucky few who has actually put my hands on a TI-88.
It came (or didn't, as it turned out) with two slots in the rear, for
expansion, and was clearly meant to hit the same market as the HP-41.
Unfortunately, the TI representative wouldn't let me buy the demo model.
TI-95 PROCALC.
FUNCTIONS: Scientific
MEMORIES: 8k memory expandable to 16k
PRGM STEPS: Fully programmable
DISPLAY: 15 character by 2 line dot matrix display
Second line in display used as 5 "soft labels"
KEYBOARD: 65 keys: 21 math keys
5 programmable function keys
9 top menu keys
SWITCHES:
BATTERIES:
PHYSICAL: 8" X 3.75" X 1" size
WEIGHT:
PRODUCTION: Manufactured 1986
COST:
INFO: o i/o port
o cartridge port
o hard shell case
o available accessories
: tape interface,
: thermal printer,
: rom and ram cartridges.
Notes: based on tms 1000 cpu, used a lot of nested menus for functions.
programming used an extended version of AOS and even allowed direct
execution of ml programs routines.
A similar calculator called the BasicCalc with different roms and
keyboard was released at about the same time.
It runs BASIC, holds 8k of memory, a maximum of 16k. It has 113 instructions.
TI-150
FUNCTIONS: Four
MEMORIES: None
DISPLAY: xx Orange Vacuum-fluorescent
KEYBOARD: 19 buttons
SWITCHES: Top Right On/Off
Top Left Decimal Point Adjust
BATTERIES: 4-AA
PHYSICAL: 6.5" x 3.2" x 1.8"
WEIGHT: 10 ounces
PRODUCTION: 1974
COST:
INFO: o Possibly the rarest TI.
o The keys and body style of the 2550, painted-on
silver trim of SR-10.
o No memory or fixed decimal switch as on 2550.
o Unusual orange display.
* TI-1000 type I
FUNCTIONS: Four, plus percentages
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: 20 buttons
SWITCHES: None
BATTERIES: 9 volt
PHYSICAL: 5.4" x 2.9" x 1.3"
WEIGHT: 4.5 oz
PRODUCTION: 1977
COST: $9.77
INFO: o Gold trim
* TI-1000 type II
FUNCTIONS: Four, plus percentages
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: 20 buttons
SWITCHES: None
BATTERIES: 9 volt
PHYSICAL: 5.4" x 2.9" x 1.3"
WEIGHT: 4.5 oz
PRODUCTION: 1977
COST: $9.77
INFO: o Brown trim
* TI-1025
FUNCTIONS: Four, plus percentage
MEMORIES: 1
DISPLAY: 8 Vacuum-fluorescent
KEYBOARD: 24 buttons
SWITCHES: None
BATTERIES: 9 volt
PHYSICAL: 5.4" x 2.9" x 1.3"
WEIGHT: 5.25 ounces
PRODUCTION: 1977
COST: $11.77
INFO: o Often found with in the origional box.
TI-1050
FUNCTIONS: Four, plus percentage and square root
MEMORIES: 2 KEY MEMORY
DISPLAY: 8 Blue Vacuum-fluorescent
KEYBOARD: 24 buttons
SWITCHES:
BATTERIES: 9 volt
PHYSICAL: 5.7" x 3.0"
WEIGHT:
PRODUCTION: 1977
COST: $12.95
INFO: o Another entry in the 1000/1025 line.
o Automatic Constant
* TI-1200
FUNCTIONS: Four, plus percentage
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: 19 buttons
SWITCHES: Left Side On/Off
BATTERIES: 9 volt
PHYSICAL: 5.5" x 2.8" x 1.4"
WEIGHT: 5.5 oz
PRODUCTION: 1975
COST: $14.88
INFO: o Often found in the origional box.
o The 1200 series styling was used on many other TI
calculators and they all shared the annoying
characteristic of loose or missing faceplates.
TI-1200 "Lady"
FUNCTIONS: Four, plus percentage
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: 19 buttons
SWITCHES: Left Side On/Off
BATTERIES: 9 volt
PHYSICAL: 5.5" x 2.8" x 1.4"
WEIGHT: 5.5 ounces
PRODUCTION: 1975?
COST:
INFO: o The 1200 with more "feminine"-colored faceplate and keys.
TI-1205
FUNCTIONS: Four, plus percentage
MEMORIES: yes
DISPLAY: xx LEDs
KEYBOARD: xx buttons
SWITCHES:
BATTERIES: 9 volt
PHYSICAL: 5.7" x 2.7"
WEIGHT:
PRODUCTION: 1976
COST:
INFO: o Another colorful 1200 relation, but this one has
oversized lettering too.
TI-1220 (T-1220)
FUNCTIONS: Four, plus percentage
MEMORIES: yes
DISPLAY: xx LEDs
KEYBOARD: xx buttons
SWITCHES:
BATTERIES: 9 volt
PHYSICAL: 5.7" x 2.7"
WEIGHT:
PRODUCTION: 1976
COST:
INFO: o This (and the 1225) are somewhat obscure, but
otherwise ordinary, 1200 series units.
TI-1225 (T-1225)
FUNCTIONS: Four, plus percentage
MEMORIES: yes
DISPLAY: xx LEDs
KEYBOARD: xx buttons
SWITCHES:
BATTERIES: 9 volt
PHYSICAL: 5.7" x 2.7"
WEIGHT:
PRODUCTION: 1976
COST:
INFO:
* TI-1250
FUNCTIONS: Four, plus percentage
MEMORIES: 1
DISPLAY: 8 LEDs
KEYBOARD: 24 buttons
SWITCHES: Left Side On/Off
BATTERIES: 9 volt
PHYSICAL: 5.5" x 2.8" x 1.4"
WEIGHT: 5.5 oz
PRODUCTION: Introduced on June 1, 1975
COST: $24.95
INFO:
TI-1255
It has a bright blue (darker than the Lady 1200) face plate
and an ivory colored case (same as the Lady 1200). Oddly, the rear label
which is black states that it is a TI-1250 but the face plate has TI-1255 on
it. from Cleo McCall (ApexMcCall@aol.com )
TI-1265
FUNCTIONS: Four, plus percentage
MEMORIES: yes
DISPLAY: xx Blue Vacuum-fluorescent
KEYBOARD: xx buttons
SWITCHES:
BATTERIES: 9 volt
PHYSICAL: 5.5" x 2.8" x 1.4"
WEIGHT:
PRODUCTION: Introduced on April 9, 1976
COST:
INFO: o Has a Blue florescent display, unique within the
1200 series.
* TI-1270
FUNCTIONS: Four, plus reciprocal, square, square root, and pi
MEMORIES: 1
DISPLAY: 8 LEDs
KEYBOARD: 24 buttons
SWITCHES: 24
BATTERIES: 9 volt
PHYSICAL: 5.5" x 2.8" x 1.4"
WEIGHT: 5.5 oz
PRODUCTION: Introduced on April 21, 1976
COST: $18.95
INFO: o The TI-1270 was designed for use in secondary schools.
Colorful model.
o TI appeared to like orange.
TI-1400
FUNCTIONS: Four, plus percentage
MEMORIES: None
DISPLAY: xx LEDs
KEYBOARD: xx buttons
SWITCHES:
BATTERIES: 9 volt
PHYSICAL: 5.7" x 2.7"
WEIGHT:
PRODUCTION: 1976
COST:
INFO: o Has a brown carrying case, not the usual black.
o Similar styling to the 1200.
TI-1450
FUNCTIONS: Four, plus percentage
MEMORIES: yes
DISPLAY: xx LEDs
KEYBOARD: xx buttons
SWITCHES:
BATTERIES: 9 volt
PHYSICAL: 5.7" x 2.7"
WEIGHT:
PRODUCTION: 1976
COST: $16.00
INFO:
* TI-1500
FUNCTIONS: Four, plus percent
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: 19 buttons
SWITCHES: Top Middle Left On/Off
BATTERIES: 2-AA NiCads (internal)
PHYSICAL: 5.0" x 2.6" x 1.0"
WEIGHT: 7 ounces
PRODUCTION: Introduced April 8, 1974
COST: $69.95, later lowered to $59.95
INFO: o Nifty little unit with thick chrome borders.
TI-1600
FUNCTIONS: Four, plus percentage
MEMORIES: None
DISPLAY: 8 Blue Vacuum-fluorescent
KEYBOARD: 20 buttons
SWITCHES:
BATTERIES: xx NiCad
PHYSICAL: 5.0" x 3.0"
WEIGHT:
PRODUCTION: Introduced on June 13, 1976
COST: $24.95
INFO: o The 1600 series consisted of slimmed-down models that
preconfigured the styling of LCD units.
TI-1650
FUNCTIONS: Four, plus percentage
MEMORIES: yes
DISPLAY: xx Blue Vacuum-fluorescent
KEYBOARD: xx buttons
SWITCHES:
BATTERIES: xx NiCad
PHYSICAL: 5.0" x 3.0"
WEIGHT:
PRODUCTION: Announced June 13, 1976
COST: $29.95
INFO:
TI-1680
FUNCTIONS: Four, plus percentage
MEMORIES: 1, plus 20 line recall
DISPLAY: 8 Blue Vacuum-fluorescent
KEYBOARD: 24 buttons
SWITCHES: None
BATTERIES: xx NiCad
PHYSICAL: 5.0" x 3.0"
WEIGHT:
PRODUCTION: Introduced on June 5, 1977
COST: $29.95
INFO: o The TI-1680 could re-display up to 20 past numbers
on its display, instead of having a printer.
o Allowed some primitive editing of those entries.
TI-1700 - DataClip
FUNCTIONS: Four plus percentage
MEMORIES: 1
DISPLAY: 8 LCDs
KEYBOARD: 22 buttons
SWITCHES: None
BATTERIES: Three Silver Oxide
PHYSICAL: About the proportions of a six-inch ruler
WEIGHT:
PRODUCTION: Announced on June 5, 1977
COST: $34.95
INFO: o LCD calculator shaped like a 6-inch ruler.
o High quality, unlike its many knockoffs.
* TI-1750 (1st LCD)
FUNCTIONS: Four, plus square root and percentages
MEMORIES: 4 key memory
DISPLAY: 8 LCDs
KEYBOARD: 24 buttons
SWITCHES: Top Left below display On/Off
BATTERIES: Two silver oxide
PHYSICAL: 4.5" x 2.7" x .4"
WEIGHT: less than 2.5 ounces
PRODUCTION: Introduced in mid-April of 1977
COST: $24.95
INFO: o TI's first LCD calculator.
TI-1790 Data Chron
FUNCTIONS: Four plus square root and percentage
MEMORIES: One
DISPLAY: 8 LCDs plus day of week
KEYBOARD: 25 buttons
SWITCHES: Time set , alarm set am,pm start/stop lap/reset,time call ,day ,date, time
BATTERIES: 2 ea G13
PHYSICAL: 2 5/8 "x 5 5/8 x 3/8
WEIGHT: 4.3 oz with case
PRODUCTION: Introduced January 5, 1978
COST: $50
INFO: o The DataChron calculator incorporated a watch with
stopwatch and alarm.
TI-2000
FUNCTIONS: Four
MEMORIES: None
DISPLAY: 7 LEDs (RED)
SWITCHES: Top left side On/Off
BATTERIES: 3x AA
PHYSICAL: 13cm tall, 7cm wide, 3.5cm thick
PRODUCTION: ~1974
INFO: The face plate is orange with a black TI-logo in the upper-left
corener, and silver lettering for the model ("TI-2000" in the
upper-right corner), and in silver the word "ON" right below
the on/off switch which is below the TI-logo.
from Eric (itdept@altrex.nl)
The key layout:
[on/off][C] [/]
[7] [8] [9] [x]
[4] [5] [6] [-]
[1] [2] [3] [+]
[CE][0] [.] [=]
TI-2500 Datamath - 1st
FUNCTIONS: Four
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: 18 buttons
SWITCHES: Top Left Side On/Off
Chain/Constant switch
BATTERIES: 4-AA NiCads (internal)
PHYSICAL: 5.5" x 3.0" x 1.7",
WEIGHT: 12 ounces
PRODUCTION: Introduced September 21, 1972
COST: $119.95
INFO: o Four and a half hours battery life were claimed.
o The TI-2500 was TI's first hand calculator.
o It was introduced along with the TI-3000 and
TI-3500 desk-top calculators.
o This model states a recharging time of 16 hours
on the back plate.
o Two screws hold the battery compartment hatch on.
o A LCD version of the Datamath called the Minimath.
It was a prototype and never released.
* 2500 Datamath - 2nd
FUNCTIONS: Four
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: 18 buttons
SWITCHES: Top Left Side On/Off
Chain/Constant switch
BATTERIES: 4-AA NiCads (internal)
PHYSICAL: 5.5" x 3.0" x 1.7"
WEIGHT: 12 ounces
PRODUCTION: 1973
COST: $119.95
INFO: o This model states a recharging time of 10 hours on
the back plate.
o No battery compartment hatch, have to remove entire back.
* TI-2500 Datamath-3rd - same as TI-2500B Datamath
FUNCTIONS: Four
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: 18 buttons
SWITCHES: Top Left Side On/Off
Chain/Constant switch
BATTERIES: 4-AA or 3-NiCads (internal)
PHYSICAL: 5.5" x 3.0" x 1.7"
WEIGHT: 12 ounces
PRODUCTION:
COST:
INFO: o Nice, quarter turn access to battery compartment hatch.
Longines Symphonette (2500)
INFO: o Just like the three types of the 2500.
* TI-2500-II
FUNCTIONS: Four
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: xx buttons
SWITCHES: Top Left Side On/Off
Chain/Constant switch
BATTERIES: 2-AA
PHYSICAL: 5.5" x 3.0" x 1.7"
WEIGHT: 12 ounces
PRODUCTION: Introduced November 11, 1974
COST: $49.95
INFO: o Similar to the 2500 but has a % key and cheap logo
strip that tends to peel off.
o With a battery hatch?
* TI-2510
FUNCTIONS: Four
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: xx buttons
SWITCHES: Top Left Side On/Off
Chain/Constant switch
BATTERIES: 4-AA
PHYSICAL: 5.5" x 3.0" x 1.7"
WEIGHT: 12 ounces
PRODUCTION: 1973
COST: $39.95
INFO: o Similar to 2500, but chronologically sandwiched
somewhere between the 2500 and 2500-II, probably
failing to land a market niche in TI's crowded
product line.
o Calculator body is a lighter cream shade compared
to 2500's beige.
o Uses disposable batteries.
o Nice, quarter turn access to battery compartment hatch.
* TI-2550
FUNCTIONS: Four, plus percentage
MEMORIES: 1
DISPLAY: 8 LEDs
KEYBOARD: 23 buttons
SWITCHES: Top Right On/Off
Top Left Decimal Point Adjust
BATTERIES: 3-AA NiCads or 4-AAs
PHYSICAL: 6.5" x 3.2" x 1.8"
WEIGHT: 10 ounces
PRODUCTION: Introduced on January 10, 1974
COST: $99.95, later down to $69.95
INFO:
* 2550-II
FUNCTIONS: Four, plus square root, square, reciprocal, and percent
MEMORIES: 1
DISPLAY: 8 Vacuum-fluorescent
KEYBOARD: 27 buttons
SWITCHES: Top Right On/Off
Top Left F/2 Digit
BATTERIES: 3 NiCad
PHYSICAL: 5.8" x 3.2" x 1.3"
WEIGHT: about 8 ounces
PRODUCTION: Introduced on October 17, 1975
COST: $49.95
INFO:
TI-2550-III
FUNCTIONS: Four, plus square root, square, reciprocal, and percent
MEMORIES: 1
DISPLAY: 8 Green Vacuum-fluorescent
KEYBOARD: xx buttons
SWITCHES:
BATTERIES:
PHYSICAL: 5.8" x 3.2" x 1.3"
WEIGHT: about 8 ounces
PRODUCTION: 1976
COST: $29.95
INFO:
TI-2550-IV
FUNCTIONS: Four, plus Playback
MEMORIES: 1
DISPLAY: 8 Green Vacuum-fluorescent
KEYBOARD: 24 buttons
SWITCHES: None
BATTERIES:
PHYSICAL: ~5.8" x 3.2" x 1.3"
WEIGHT: ~about 8 ounces
PRODUCTION: 1978
COST: $
INFO: o Info from Thomas Brockmeier
TI-3500
Need Info
TI-4000
twelve digits with commas, and a memory
TI-5025 (printer)
FUNCTIONS: Four plus percentage
MEMORIES: 1
DISPLAY: 8 Vacuum-fluorescent
KEYBOARD: 24 buttons
SWITCHES:
BATTERIES: xx NiCad
PHYSICAL: 7.0" x 3.5"
WEIGHT:
PRODUCTION: 1979
COST: $89.95
INFO: o Portable Display Printer
* TI-5040
FUNCTIONS: Four
MEMORIES: 1
DISPLAY: 10 Blue Vacuum-fluorescent
KEYBOARD: 27 keys
SWITCHES: Right side, On/Off
Top right keyboard, F/A format
BATTERIES: AC power
PHYSICAL: 9.4" x 9.25" x 3.0"
WEIGHT: ~5 lbs
PRODUCTION: 1977
COST: $129.95
INFO: o Common desktop model with printer.
TI-5050
FUNCTIONS: Four plus percentage
MEMORIES:
DISPLAY: None, Paper Tape only
KEYBOARD: xx buttons
SWITCHES:
BATTERIES: xx NiCad
PHYSICAL: 8.7" x 3.9" x 2.7"
WEIGHT: 28 ounces
PRODUCTION: Introduced on March 24, 1975
COST: $199.95
INFO: o The TI-5050 was a printing calculator. It printed
on two-inch wide paper.
o Handheld printing unit with memory.
TI-5050M
FUNCTIONS: Four plus percentage
MEMORIES:
DISPLAY: None, Paper Tape only
KEYBOARD: 23 buttons
SWITCHES:
BATTERIES: xx NiCad
PHYSICAL: 8.5" x 4.0
WEIGHT:
PRODUCTION: 1976
COST: $99.95
INFO:
Able IV
FUNCTIONS: Four plus percentage
MEMORIES: None
DISPLAY: xx LEDs
KEYBOARD: 16 buttons
SWITCHES:
BATTERIES: 9 volt
PHYSICAL: 5.5" x 2.75"
WEIGHT:
PRODUCTION: 1976
COST:
INFO:
* Business Analyst
FUNCTIONS: Business
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: 40 buttons
SWITCHES: None
BATTERIES: 9 volt rechargable pack
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 6.25 oz
PRODUCTION: Introduced on June 13, 1976
COST: $49.95
INFO: o The first in a long line of financial calculators.
* Business Analyst I
FUNCTIONS: Business
MEMORIES: None
DISPLAY: 12 LEDs
KEYBOARD: 40 buttons
SWITCHES: None
BATTERIES: 2-AA NiCad to 9 volt
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 5.5 ounces
PRODUCTION: 1979
COST:
INFO:
Concept I
FUNCTIONS: Four plus percentage
MEMORIES: None
DISPLAY: xx LEDs
KEYBOARD: xx buttons
SWITCHES:
BATTERIES: 9 volt
PHYSICAL: 5.7" x 2.7"
WEIGHT:
PRODUCTION:
COST:
INFO:
Concept II
FUNCTIONS: Four plus percentage
MEMORIES: yes
DISPLAY: xx LEDs
KEYBOARD: xx buttons
SWITCHES:
BATTERIES: 9 volt
PHYSICAL: 5.7" x 2.7"
WEIGHT:
PRODUCTION:
COST:
INFO:
Exactra 19
FUNCTIONS: Four
MEMORIES: None
DISPLAY: 6 LEDs
KEYBOARD: 18 buttons
SWITCHES: Left, On/Off
BATTERIES: 3-AA
PHYSICAL: 5.25" x 3.0
WEIGHT:
PRODUCTION:
COST:
INFO:
Exactra 20 (TI-20)
FUNCTIONS: Four
MEMORIES: None
DISPLAY: 6 LEDs
KEYBOARD: xx buttons
SWITCHES: Left, On/Off
BATTERIES: 3-AA
PHYSICAL: 5.25" x 3.0"
WEIGHT:
PRODUCTION:
COST:
INFO:
Exactra 21
FUNCTIONS: Four
MEMORIES: None
DISPLAY: 6 LEDs
KEYBOARD: xx buttons
SWITCHES: Left, On/Off
BATTERIES: 3-AA
PHYSICAL: 5.25" x 3.0"
WEIGHT:
PRODUCTION:
COST:
INFO:
Exactra 22
FUNCTIONS: Four
MEMORIES: None
DISPLAY: 6 LEDs
KEYBOARD: xx buttons
SWITCHES: Left, On/Off
BATTERIES: 3-AA
PHYSICAL:
WEIGHT:
PRODUCTION:
COST:
INFO:
Exactra 23
FUNCTIONS: Four
MEMORIES: None
DISPLAY: 6 LEDs
KEYBOARD: xx buttons
SWITCHES: Left, On/Off
BATTERIES: 3-AA
PHYSICAL: 5.25" x 3.0"
WEIGHT:
PRODUCTION:
COST:
INFO:
Exactra 100
Never released?
* MBA
FUNCTIONS: Business
MEMORIES: 12
DISPLAY: 12 LEDs
KEYBOARD: 40 buttons
SWITCHES: Top Right On/Off
BATTERIES: 9 volt rechargeable
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 6.5 oz
PRODUCTION: Introduced on June 5, 1977
COST: $79.95
INFO: o This was an early business-oriented machine with
several keys for standard business functions.
* Money Manager
FUNCTIONS: Business
MEMORIES:
DISPLAY: 8 LEDs
KEYBOARD: 40 buttons
SWITCHES: None
BATTERIES: 9 volt NICA
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 5.5 oz
PRODUCTION: Introduced on January 13, 1977
COST: $26.95
INFO: o The Money Manager was aimed at home finance calculatins.
* PC-100A (printer) 1979
* PC-100C (printer) 1979
* Programmer
FUNCTIONS: Four plus Base math
MEMORIES: 1
DISPLAY: 8 LEDs
KEYBOARD: 40 buttons
SWITCHES: None
BATTERIES: 2-AA NiCad to 9 volt
PHYSICAL: 5.8" x 3.2" x 1.4"
WEIGHT: 6.25 ounces
PRODUCTION: 1978
COST: $42.50
INFO: This calculator was also produced with a LCD display.
(See the "Other Later LCD Models" page for more information).
from Arthur Hagen <art@broomstick.com>
The "TI Programmer" exists in two different versions -
one with LEDs and one slimmer one with a LCD display.
I still use the latter, and it says Copyright 1978 just
like the LED version, although it was produced in the
early 80's.
As for the price, I paid the equivalent of $120 for it
when it was new, but prices here in Norway are much higher.
* Spirit of 76
FUNCTIONS: Four plus percentage
MEMORIES: None
DISPLAY: 8 LEDs
KEYBOARD: 19 buttons
SWITCHES: Left Side On/Off
BATTERIES: 9 volt
PHYSICAL: 5.5" x 2.8" x 1.4"
WEIGHT: 5.5 ounces
PRODUCTION: 1976
COST:
INFO: o Red/White/Blue Bicentennial (of the USA) model.
o Another 1200 progeny.
Tax Planner
FUNCTIONS: Complete Tax Functions
MEMORIES:
DISPLAY: xx LEDs
KEYBOARD: xx buttons
SWITCHES:
BATTERIES: 4-AA
PHYSICAL: 6.5" x 3.0"
WEIGHT:
PRODUCTION: 1983
COST:
INFO: o (c) Warren, Gorham, & Lambert
o Appears to be a highly modified TI-59
Special Thanks
Andreas Krause (a-krause2@ti.com)
Gene Wright (gene@theporch.com)
Achim Lewandowski (lewandowski@forwiss.de)
Alan Robinson (trw@iland.net)
Andy E (andye@att.com)
Albert Rupprecht (es9j4@yahoo.com)
Arthur Hagen (art@broomstick.com)
Eric (itdept@altrex.nl)
Shaun (loomis@neo.rr.com)
Doug (alwaysup@att.net)
Sebastian (sebastia@flash.net)
Raymond Flowers (Quadrajet1@aol.com)
Thomas Brockmeier: TI-15 (German), TI-31, TI-33, TI-41, TI-42 MBA, TI-45, and the TI-2550-IV.
Gene Wright - Lots of Info on the Scientific models.
If you should own a model that I have inaccurately or incompletely described
then help me to correct and/or fill in the details. Your E-mails and
photos are appreciated.
Rick Furr (rfurr@vcalc.net)
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