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The HP 48 is a series of graphing calculators using Reverse Polish Notation (RPN) and the RPL programming language, produced by Hewlett-Packard from 1990 until 2003. The series include the HP 48S, HP 48SX, HP 48G, HP 48GX, and HP 48G+, the G models being expanded and improved versions of the S models. The models with an X suffix are expandable via special RAM (memory expansion) and ROM (software application) cards. In particular, the GX models have more onboard memory than the G models. The G+ models have more onboard memory only. The SX and S models have the same amount of onboard memory. Note that the similarly named hp 48gII (2004) is not really a member of the series, but rather much more closely related to the hp 49g+. The hardware architecture developed for the HP 48 series became the basis for the HP 38G, with a simplified user interface and an infix input method, and the HP 49G with various software enhancements. Likewise, the hardware and software design of the HP 48 calculators are themselves strongly influenced by other calculators in the HP line, most of all by the HP-18C and the HP-28 series. ==Models / Availability== The HP 48SX was introduced on 1990-03-06. Availability: * 48SX: 1990–1993 * 48S: 1991–1993 * 48GX (F1895A): 1993–2003〔 * 48GX ASEE: 1993 (special edition labelled "1893 ASEE 1993 Shaping our world - Century II") * 48G: 1993–2003〔 * 48G+ (F1630A, F1894A): 1998–2003〔 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 48 series」の詳細全文を読む スポンサード リンク
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