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. 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. 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 SX and S models have the same amount of onboard memory. The G+ models have more onboard memory only. In particular, the GX models have more onboard memory than the G models. The models with an X suffix are expandable via special RAM (memory expansion) and ROM (software application) cards. The series includes 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 HP 48 is a series of graphing calculators using Reverse Polish Notation (RPN) and the RPL programming language, designed and produced by Hewlett-Packard from 1990 until 2003. Serial, Infrared, Kermit (protocol), ( Xmodem added on G series) Clarke 1LT8 ( Saturn core for the HP48S series) and the Yorke HP 00048-80063 ( Saturn core for the HP48G series)
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