The Hewlett-Packard 9100A (hp 9100A) is an early programmable calculator (or computer), first appearing in 1968. HP called it a desktop calculator because, as Bill Hewlett said, "If we had called it a computer, it would have been rejected by our customers' computer gurus because it didn't look like an IBM. We therefore decided to call it a calculator, and all such nonsense disappeared."
An engineering triumph at the time, the logic circuit was produced without any integrated circuits, the assembly of the CPU having been entirely executed in discrete components. With CRT readout, magnetic card storage, and printer, the price was around $5,000 ($36,000 today).
The 9100A was the first scientific calculator by the modern definition (i.e. trig, log/ln, and exponential functions), and was the beginning of Hewlett-Packard's long history of using Reverse Polish Notation (RPN) entry on their calculators.
Due to the similarities of the machines, Hewlett-Packard was ordered to pay about $900,000 in royalties to Olivetti after copying some of the solutions adopted in the Programma 101, like the magnetic card and the architecture.
- "History of the 9100A desktop calculator, 1968". Hewlett Packard. Retrieved 2009-12-18.
- Aaron, Clark (Dec 2000). "Wired 8.12: Must Read: The First PC". web.archive.org. Retrieved 4 October 2015.
- See Old Calculator Museum definition at the end of cited page (note with asterisk)
- "Note in: WANTED - Data Acquisition Corp. DAC-512". www.oldcalculatormuseum.com. Note with asterisk at the end.
- "Osborne's Story". HP9825.com. Retrieved 2010-05-11.
- "How the Model 9100A Was Developed", Bernard M. Oliver, September 1968, Hewlett-Packard Journal]
- 1994 letter from Tom Osborne to Barney Oliver, hp9825.com
- Federal Reserve Bank of Minneapolis Community Development Project. "Consumer Price Index (estimate) 1800–". Federal Reserve Bank of Minneapolis. Retrieved January 2, 2019.
- "Olivetti Programma P101/P102". Old Computers. Retrieved 11 August 2010.
The P101, and particularly the magnetic card, was covered by a US patent (3,495,222, Perotto et al.) and this gave to Olivetti over $900.000 in royalties by HP alone, for the re-use of this technology in the HP9100 series.
- Perotto, Pier Giorgio (February 10, 1970). "3,495,222 Program Controlled Electronic Computer" (multiple). United States Patent Office. et al. Google patents. Retrieved November 8, 2010.
- "HP 9100A Calculator (marketing brochure)" (PDF). Hewlett Packard. 1968. Retrieved 2013-01-26. Hosted at the Computer History Museum.
- "HP 9100A/B". The Museum of HP Calculators. Retrieved 2013-01-26.
- Bell, C. Gordon; Newell, Allen (1971). "Chapter 20: The HP Model 9100A computing calculator". Computer Structures: Readings and Examples. McGraw-Hill. p. 243. ISBN 0-07-004357-4. Retrieved 2009-12-18.
- Steven Leibson interview of Tom Osborne
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