Analysis of information sources in references of the Wikipedia article "History of personal computers" in English language version.
...its venerable PC 9800 series, which has sold more than 18 million units over the years, and is the reason why NEC has been the number one PC vendor in Japan for as long as anyone can remember.
{{cite web}}: CS1 maint: multiple names: authors list (link)The Programma P101 may be considered as the first programmable electronic desk top calculator in the world.
There were neither microprocessor (not yet invented) nor integrated circuits in the P101, but only transistors, resistors and condensers.
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.
technically, the machine was a programmable calculator, not a computer.
It appears that the Mathatronics Mathatron calculator preceeded [sic] the Programma 101 to market.
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