Oh, no, not again! Another "almost programmable"! These calculators drive me nuts. They're nice, useful, accurate, and ergonomic... what on Earth possessed the designers at Texas Instruments to not include a GOTO and a conditional instruction? About the only reason I can think of is marketing: they probably didn't want to jeopardize the market of their higher-end programmable calculators.

The TI-60 (not to be confused with the SR-60, also from Texas Instruments) looks and feels very much like the TI-55-II or TI-55-III. Indeed, any differences are superficial, except that the TI-60 has about twice the amount of memory of the LCD TI-55s. Unfortunately, the completely unmerged programming model makes this larger program memory less useful than it could be. I have not, for instance, found a way to shoehorn a reasonable approximation of the Gamma function into this calculator.

One good thing: this calculator's RST button, when used in a program, does not stop program execution; instead, execution continues at step 0, so rudimentary loops are possible, just like on the original (LED display) TI-55. As an example, here again is a simple factorial implementation. When the calculation is complete, the program stops with an error, and the result can be recalled from memory register 0:

PC00    OP61    STO
PC01    OP01    1
PC02    OP76    1/x
PC03    OP71    RCL
PC04    OP01    1
PC05    OP65    ×
PC06    OP61    STO
PC07    OP00    0
PC08    OP53    (
PC09    OP71    RCL
PC10    OP01    1
PC11    OP75    -
PC12    OP01    1
PC13    OP54    )
PC14    OP22    RST