HP-28S. The HP-28C and HP-28S were two graphing calculators produced by Hewlett-Packard from 1986 to 1992. The HP-28C was the first handheld calculator capable of solving equations symbolically. They were replaced by the HP 48 series of calculators, which grew from the menu-driven RPL programming language interface first introduced in these HP ...

通过 HP-28C，惠普彻底改造了科学计算器。 该模型进行符号数学运算，使用命名变量，理解多种数据类型，并且是第一个完整的 RPL 计算器。 （HP-18C 在内部使用 System RPL，但没有向计算器用户提供 RPL。 ）它非常强大，具有从 HP-18C 继承的丰富功能和许多特性，包括红外打印，使用户摆脱了电缆的混乱 、标记的软键、菜单和专用的字母数字键盘，使创建复杂的程序和表达式更加方便。 要了解 HP-28C，读者应首先访问 RPL 页面。 因为 HP-28C 是第一个完整的 …

hp-28c/s With the HP-28C, Hewlett-Packard completely revamped the scientific calculator. This model did symbolic math, used named variables, understood many data types and was the first full RPL calculator.

Free download of a color scan of the English-language book 'HP-28S Reference Manual' by Hewlett-Packard, which is an owner's manual (user's guide, operating manual, owner handbook) for the HP-28S calculator.

The HP-28S became the more common and popular calculator of the two. It is a lightweight handheld scientific and graphing calculator that weighs in at a mere 7.2 oz. It is pocket sized and offers just the right balance between power and ease of use.

View and download Hp28s manuals for free. HP-28S instructions manual.

2022年1月27日 · HP-28S 是第一个完整的RPL计算器，它的存储从上一代28C的2k提升到了32k，速度从640kHz提升到了1MHz，屏幕为137×32像素的LCD点阵屏，能显示四行信息。HP-28S缺点是没有和计算机通信的接口，同时它的电池盖非常脆弱。28S被随后的48系列所取代。

The 28S is an improved version of the 28C, with more RAM (32 kB vs. 2 kB), a faster processor, directories, and a few more mathematical functions (e.g., PERM, COMB). The 28 takes 3 "N" cells. This is unfortunate, as these are typically sold in packs of 2. Be careful not to damage the battery cover, which is poorly designed. I concur to that!

HP-28S notes: To start the continuous self test, with the calculator turned on, press and hold ON and press . The calculator will step through a series of self-tests and will display OK-28S briefly at the end and then loop back to the beginning and repeat.

2005年5月30日 · Emulator of the HP 42S, 28S, 27S, 32SII, 17BII, and 17B that runs on Pocket PC 2002, Windows Mobile 2003 (SE), 5.0, and 6 Professional (ARM platform). Includes KML scripts and bitmaps (skins) and source code, but no ROM dumps.