HP-41 Extension Module
HP-41 extension (or expansion) modules allowed the user of a HP-41 programmable calculator to extend the functionality of the machine. The HP-41 had room for up to four expansion modules at the back of calculator.
The HP-41 was not the only calculator of its generation that allowed expansion modules. The TI-58 and TI-59 also had pluggable ROM modules. The HP-41 modules were however much more versatile.
Read more about HP-41 Extension Module: The Memory Modules (HP-41C Only), The Application Pacs, The 82104A Card Reader, The 82182A Time Module, The 82143A Thermal Printer/Plotter, The 82153A Optical Wand, The 82180A Extended Functions Module, The 82181A Extended Memory Module, The HP82160A HP Interface Loop (HP-IL) Module
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