Retro Review: Texas Instruments TI-60
Company: Texas Instruments
Type: Programmable Scientific
Memory: 84 steps or 12 memory registers
Battery: 2 * Duracell MS76, Panasonic WL-14, Eveready 376 or 303, AG-13, SR44
Years: 1986 – 1991
Editions: 2: 1986 (Advanced Scientific), 1990 (Programmable Scientific)
Original Cost: $50
The TI-60 is a scientific keystroke programmable calculator, largely based off of the original TI-55 (1977). The features of the TI-60:
Operating System: AOS (Algebraic Operating System) (like the TI-30Xa)
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
Shift Keys: 2nd, 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 [2nd] [ . ] ( Δ% ), then old value, [ = ].
Example: Percent change from 32 to 56: 56 [2nd] [ . ] (Δ%) 32 [ = ] 75 (75% increase)
Combinations and Permutations
Like the TI-55 III, the arguments for combination and permutation functions take one argument in the form of nnn.rrr.
Combination where n = 25, r = 5 is entered as 25.005 [2nd] [ + ] (nCr)
Permutation where n = 25, r = 5 is entered as 25.005 [2nd] [ = ] (nPr)
[2nd] [x<>y] (P-R): to Rectangular. Input: r [x<>y] θ [2nd] [x<>y] (P-R). Result: y [x<>y] x.
[INV] [2nd] [x<>y] (P-R): to Polar. Input x [x<>y] y [INV] [2nd] [x<>y] (P-R). Result: θ [x<>y] r.
The TI-60 has the parts labeled Intcp (y-intercept) and Slope. Running the statistics mode reduced the maximum number of steps to 20 until the statistics registers were cleared.
TI-60 vs TI-55 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 TI-58 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
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 TI-60 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 √ 2nd functions on a gray background.
For the keystroke calculators from Texas Instruments, the TI-60 one of my favorite, second to the TI-58C.
This blog is property of Edward Shore, 2018.