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 …

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 …

凭借其新的点阵屏幕，hp-28c 是惠普第一款显示图形的袖珍计算器。 用户可以控制比例和位置，可以将十字准线移动到绘图上的某个位置，并让计算器将坐标发送到 堆栈 。

2025年2月17日 · The largest, best source on the Internet for software for and information about Hewlett Packard's HP Prime, HP 50g, HP 49G, HP 48 series, HP 38G, and HP 28 series …

Free download of a color scan of the English-language book 'HP-28C Reference Manual' by Hewlett-Packard, which is an advanced user's guide or advanced user's reference for the HP …

2015年2月17日 · The HP-28C was introduced with 2K bytes of storage. The HP-28S replaced it a year later with 32K bytes at the same price. The HP-28S also added: Directories. Directories …

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 …

This advanced scientific calculator, to use the maker's phrase, was the first graphing handheld electronic calculator made by Hewlett-Packard. It also was the first HP calculator using …

To start the self test, with the calculator on, press and hold ON and press . The calculator will beep and display a series of vertical bars. You can now press any key to step through a series …

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.