My favorite old pocket computer … drum roll!

…is the TI-66 Programmable Calculator.

TI-66 pocket computer and manual
TI-66 Calculator and Manual

It is small and light and Turing complete. The programming records key presses as well as allowing for entering instructions in an assembly-like language, so it is a great primer for learning full Assembly language programming, which is what I am doing now on my HP95LX.

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