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The HP-9100B Desktop Calculator
The HP-9100B desktop calculator was the pinnacle of scientific, desktop computer power in its day.
It features a CRT onto which the calculator draws (via vector graphics) 7-segment numbers.
It also has a magnetic card reader (but unfortunately I don't have any magnetic cards).
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Inside the HP-9100 (Cover Up)
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This is the HP-9100 with its cover open.
It has a main circuit board along the base of the unit which contains all kinds of
discrete components (diodes, resistors).
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Inside the HP-9100 (Main Board Detail)
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This is a detail of the main board.
Off at the bottom right corner you can see the mechanism for the magnetic card reader.
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HP-9100 Displaying PI
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Check out the individual digits on the CRT display.
They are drawn using vector graphics, and simulate a 7-segment display.
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