Remoticon 2021 - Rob Weinstein Builds an HP-35 from the Patent Up

Explore the fascinating journey of reverse engineering and recreating the HP-35, the first handheld scientific calculator, in this 35-minute conference talk from Hackaday's Remoticon 2021. Delve into the world of 1970s electrical engineering as Rob Weinstein meticulously dissects the original patent, deconstructs the device to its transistor-level components, and ingeniously rebuilds it within an FPGA. Gain insights into the HP-35's historical significance, its intricate inner workings, and the innovative "barber pole timing" mechanism. Discover the complexities of the serial adder-subtractor and examine detailed design documentation, including front, lower, and back side layouts. Learn about the operating manual and get a comprehensive understanding of this groundbreaking device that revolutionized scientific calculations half a century ago.

Introduction
Overview
HP35 Background
The 569 Patent
How does the HP35 work
Design documentation
Barber pole timing
Serial adder subtractor
Front Side
Lower Side
Back Side
Back Side Layout
Operating Manual
Contact Information