HP-01

HP-01
Hewlett Packard Digital Watch Model 1
Type	Quartz
Display	Digital
Introduced	1977

The Hewlett-Packard HP-01 was a calculator wristwatch. It was designed and manufactured by Hewlett-Packard. The HP-01 used 7 light-emitting diodes (LEDs)/digit in a 7 digit + decimal point arrangement for its digital display. Introduced in 1977 at the height of the LED watch craze, five models were available, two gold filled models and three stainless models. Prices were from $450 & $550 for the low end steel or gold to $850 (the equivalent of $2,500 to $3,300 in 2014 dollars). HP also sold a battery replacement kit that allowed the customers to change the batteries themselves. It used 2 batteries for the display and one for the processor IC. It also came with a ball-point pen with a stylus on the rear end. Most of the 28 buttons on the HP-01 were recessed and were designed to be depressed with a stylus that was stored by snapping it into the band. The production was stopped by the end of 1979.

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." It could also tell you the day of the week for any day from 1900 to 2099.
The HP-01 was Hewlett-Packard's first algebraic calculator. Prior to the HP-01, all Hewlett-Packard calculators used Reverse Polish Notation (RPN). In later years, some HP calculators used a mixture of both.

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Hewlett-Packard calculators

Graphing:	9g 28C 28S 38G 39G 39g+ 39gs 39gII 40G 40gs 48S 48SX 48G 48G+ 48GX 48gII 49G 49g+ 50g Prime Xpander

Scientific programmable:	10C 11C 15C 16C 19C 20S 21S 25 25C 29C 32S 32SII 33C 33E 33s 34C 35s 41C 41CV 41CX 42S 55 65 67 71B 95C 97 97S 9100A 9100B 9805

Scientific non-programmable:	6s 6s Solar 8s 9s 10s 10s+ 21 22S 27 27S 30s 31E 32E 35 45 46 91 300s 300s+

Financial/business:	10B 10bII 10bII+ 12C 12c Platinum 12c Prestige 14B 17B 17BII 17bII+ 18C 19B 19BII 20b 22 27 30b 37E 38C 38E 70 80 81 92

Others:	01 10 CalcPad 100 CalcPad 200 QuickCalc EasyCalc OfficeCalc PrintCalc

Related topics:	RPN RPL PPL FOCAL ALG CAS

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