HP-01

The Hewlett-Packard HP-01 is the only calculator wristwatch ever manufactured and sold to the public by Hewlett-Packard. The HP-01 used light-emitting diodes (LEDs) for its digital display. Introduced in 1977 at the height of the LED watch craze, two models were available, a gold filled model for US$750 and a stainless model for US$650. Most of the 28 buttons on the HP-01 were recessed and were designed to be depressed with a stylus.

The HP-01 was unique not only as the only Hewlett-Packard watch but due to these unique features:

*Datatype for time, date, and time interval, and the ability to perform mathematics on these datatypes.
*A stopwatch that allows the stopwatch time to be multiplied or divided by a constant, and continuously display the results. This was referred to as a "Dynamic Rate Calculation."
*The HP-01 was Hewlett-Packard's first algebraic calculator. Prior to the HP-01, all Hewlett-Packard calculators used Reverse Polish notation. In later years,some H-P calculators used a mixture of both.

External links

* [http://www.hp.com/hpinfo/abouthp/histnfacts/museum/personalsystems/0022/index.html Hewlett-Packard Official Page on the HP-01]
* [http://www.hp.com/hpinfo/abouthp/histnfacts/museum/personalsystems/0022/other/0022hpjournal.pdf December 1977 Hewlett-Packard Journal - Entire issue dedicated to the HP-01]