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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. == The Memory Modules (HP-41C only)== Memory modules added RAM main memory to the calculator, allowing more programming steps and/or more data registers. The original HP-41C had a main memory of 63 registers of 7 bytes each. Each register could hold either a number, a 6-character string, or up to 7 program steps in the Focal language (program steps used a variable number of bytes). Each memory module added 64 registers, and the calculator could hold up to 4 of them, for a grand total of 319 registers. While this was considered huge for the time (a little more than 2 kilobytes,) all expansion slots were used. User groups found a way to merge two memory chips in a single module, thus freeing two expansion slots. HP designed a module holding all four in one slot, the so-called ''Quad Memory Module''. The later HP-41CV had the quad module built-in. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「HP-41 extension module」の詳細全文を読む スポンサード リンク
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