Retro Review: Texas
Instruments TI60
General Information
Company: Texas Instruments
Type: Programmable
Scientific
Memory: 84 steps or
12 memory registers
Battery: 2 * Duracell
MS76, Panasonic WL14, Eveready 376 or 303, AG13, SR44
Years: 1986 – 1991
Editions: 2: 1986 (Advanced Scientific), 1990
(Programmable Scientific)
Original Cost: $50
Features
The TI60 is a scientific keystroke programmable calculator,
largely based off of the original TI55 (1977).
The features of the TI60:
Operating System: AOS
(Algebraic Operating System) (like the
TI30Xa)
Programming: Up to 56
program steps
Statistics: Linear
Regression
Conversions: °F/°C,
DMS/DD, in/cm, lb/kg, gal/L
Base Conversions:
Octal and Hexadecimal, has 2’s complement
Memory Registers: Up to 8, competed with both statistics and
programming
Other Functions:
Percent Change, Absolute Value, Signum, Integer Part, Fractional Part
Integration
Shift Keys: 2^{nd}, hyp, INV
Storage Arithmetic:
+, , *, ÷, ^, roots, percent change
Percent Key (Δ%)
I think the percent works backwards than modern
calculators. Press the new value first,
then [2^{nd}] [ . ] ( Δ% ), then old value, [ = ].
Example: Percent
change from 32 to 56: 56 [2^{nd}]
[ . ] (Δ%) 32 [ = ] 75 (75% increase)
Combinations and Permutations
Like the TI55 III, the arguments for combination and
permutation functions take one
argument in the form of nnn.rrr.
Example:
Combination where n = 25, r = 5 is entered as 25.005 [2^{nd}]
[ + ] (nCr)
(Result: 53,130)
Permutation where n = 25, r = 5 is entered as 25.005 [2^{nd}]
[ = ] (nPr)
(Result: 6,375,600)
Rectangular/Polar Conversion
[2^{nd}] [x<>y] (PR): to Rectangular. Input:
r [x<>y] θ [2^{nd}] [x<>y] (PR). Result: y [x<>y] x.
[INV] [2^{nd}] [x<>y] (PR): to Polar.
Input x [x<>y] y [INV] [2^{nd}] [x<>y] (PR). Result:
θ [x<>y] r.
Linear Regression
The TI60 has the parts labeled Intcp (yintercept) and
Slope. Running the statistics mode reduced the maximum number of steps to 20
until the statistics registers were cleared.
TI60 vs TI55 III
TI60

TI55 III

84 maximum steps or 12 memory registers

56 maximum steps or 8 memory registers

Clear programs outside of Learn mode

Clear programs inside of Learn mode

Each step you keyed is displayed in a PC(step #) OP(key code #) format

After each step, display is advanced to next available
step, have to press BST to view what you just did, like the TI58 series

Base Mode: Octal
and Hexadecimal

No base mode

The RST (reset) instruction loops to Step 00

The RST (reset) instruction stops execution, directs
program to Step 00

Verdict
I wish TI had implemented this keystroke system earlier. I like the fact that the RST instruction
allowed for loops. I like that the user
can see what was pressed after each step.
The TI60 came at the tail end of the keystroke programmable
calculators for Texas Instruments. The keys
are a pleasure a press, the contrast of the fonts is for the most part,
excellent, except for the gray 1/x and √ 2^{nd}
functions on a gray background.
For the keystroke calculators from Texas Instruments, the
TI60 one of my favorite, second to the TI58C.
Eddie
This blog is property of Edward Shore, 2018.
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