Hp 48sx scientific calculator owners manual

On the HPSX, units could be attached to numbers and problems could be solved in a natural way. The Units catalog was extensive including unit prefixes such as m milli , n nano , and a atto and the user could also create user-defined units which were defined in terms of the existing units. The Solver was fully unit-capable as well. To solve for a variable when the data had units, the user entered an initial guess including the desired units. PCs and serial ports had become well-established by this time.

Another company made a 3. Serial port configuration was typically quite complicated at the time. The standard RS port used a pin connector and connecting devices would frequently require crossing certain pairs of signals or looping them back. The HPSX attempted to minimize this confusion by using only three wires transmit, receive, and ground and using the most common soft handshaking. The HPSX extended the infrared output ability of earlier models to allow input as well.

This allowed calculators to talk to each other and allowed some unusual applications such as motion sensors. HP limited the range of 2-way communication at the request of teachers who were nervous about invisible message passing.

The HPSX included two expansion ports. RAM cards were available which had internal batteries to preserve data and programs even when removed from the calculator. By the time the HP was introduced, the Internet was well established in universities and high tech companies. First, an HP newsgroup comp. The available programs were and are very diverse, covering all the areas one would expect and also including such unusual calculator programs as:.

The HPSX was introduced first. The HPS was introduced the next year as a lower cost version. It had all of the HPSX features except for the expansion ports. Both versions used a Saturn architecture processor.

HPSX features. HPS features. Manuals Available. Saturn Architecture. Equation Writer Though makers of algebraic calculators had claimed for nearly 20 years that their calculators allowed entry of expressions just as the were written on paper, this was never quite true.

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