by Wlodek Mier-Jedrzejowicz Ph.D.
|Introduced on August 1 1973, this was the
fifth handheld electronic calculator sold by HP, and the
second business model. To be specific, the first one -
the HP-80 - was called a "financial"
whereas the HP-70 was called a "business" calculator. In practice this meant that the HP-70 had fewer functions than the HP-80, and was $120
cheaper than the HP-80 had been when introduced.
The HP-70 does have some innovations - for example there is a key for display setting control - the display settings could be controlled on the HP-80 too, but there was no key specially for this purpose. The double-width key is now called ENTER, not SAVE as on the HP-80. There is a memory register for accumulating values - this is the first (and only?) HP handheld with an M+ button. There is a second register, which contains the number 12 when the HP-70 is turned on - for use in calculations for a fixed number of intervals - usually 12 months in a year.
These changes, and the
manual which contains lots of example calculations, and
even the codename "Scrooge" suggest
that the HP-70 was introduced as a cheaper business model
to fight competitors. It is not clear how successful this
was - the HP-70 is somewhat rare!
This article is part of the WMJARTS file. This file contains a series of articles written by Wlodek Mier-Jedrzejowicz and published in DATAFILE, the journal of the HPCC. The article was reproduced with permission of the author.
Copyright © Wlodek Mier-Jedrzejowicz Ph.D.