Technical Desktops


Early Calc and Computers Selection:

Name: 9810A
Product Number: 9810A
Introduced: 1971
Division: Calculator Products
Ad: Click to see, Click to see
Original Price: $2975
Catalog Reference: 1972, page 408


The 9810A was HP's second generation RPN calculator. It replaced the 9100. Instead of a CRT, the 9810A had a three-line LED display. It was also upgradable with ROM modules to perform additional functions (math functions, peripheral I/O, etc). The 9810A had a built-in card reader and an optional 16-character, internal thermal printer. Unlike the 9100 which had a single expansion slot, the 9810A had four expansion slots in the rear of the machine.

To download an emulator of HP 9800 Series computers (9810, 9820 and 9830), visit Achim Burger's site at:

Click here to see Mattis Lind's video on the 9810A.

Collector’s Notes:

The museum has one fully functioning 9810 and one partially functioning unit. The most common failure mode for these machines is no display on power up. This is usually caused by a failure on one of the pluggable PCBs inside the machine. If you have a functioning unit, you can determine which of the internal boards is bad by board swapping. Some of the PCBs in the 9810 are also common to the 9820 and the 9830. So, these computers are a source for swapping some of the boards in the 9810.

Almost all original 9810 and 9820 computers have defective magnetic card readers. The soft drive wheels on these assemblies become gooey over time and will not properly grip the cards. Click here for instructions on how to fix the drive wheels.

The best resource for repairing these computers is Tony Duell's 98X0 repair manual which can be found here.


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