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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).


Inside the HP-9100 (Cover Up)


The HP-9100 with its cover up S M L XL

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).


Inside the HP-9100 (Main Board Detail)


Detail View of the HP-9100 Main Board S M L XL

This is a detail of the main board. Off at the bottom right corner you can see the mechanism for the magnetic card reader.


HP-9100 Displaying PI


HP-9100 Displaying PI S M L XL

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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