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 ...

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.

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 Owner's Manual' by Hewlett-Packard, which is an owner's manual (user's guide, operating manual, owner handbook) for the HP-28S calculator.

In ~1991, i bought the HP-28s calculator for ~$250. It was introduced in 1988 and is the first calculator that is capable of symbolic computation. For example, you can use it to solve quadratic equation symbolically.

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 Quick Reference (49 pages) Direct-Key Commands Brand: Hp | Category: Calculator | Size: 0.28 MB

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.

HP-28S Famous calculator made by Hewlett-Packard from 1988 – 1992. Memory 32768 bytes for stack, programs and data. Approximately 31.6 kBytes available to the user.

2002年10月23日 · It turns out that the HP-28S is a surprisingly fast unit! It easily beats the Casio fx-880P, Casio fx-2000C, TI-74 and the HP-32SII. Compared to the HP-15C/41CV/CX it is about 20 times as fast.