The slide rule killer: a milestone in computer history.
following articles I will describe in detail a major invention of the 70’s.
In January 1972, Hewlett-Packard introduced the HP-35 "to give you a high precision portable electronic slide rule" as declared in the User Manual.
That meant a huge challenge at that time:
- the ability to perform a broad variety
of computations as compared to the usual 4 operations : logarithmic, powers,
direct and inverse trigonometric functions ...,
I will cover, in depth, the key inventions that HP brought to this project, without forgetting technological and economic context of this saga, as well as the portrait of the key men involved.
I will describe HP 35 hardware architecture and will comment the calculator firmware, detailing the key algorithms function by function: ln, log, sin, cos, 1/x .. etc, giving commented trace of sample run on a HP35 ROM simulator.
A way to pay tribute to this brilliant machine.
© Hewlett-Packard Company 1972.