HP 9820

           <<<    >>>    ^^^

Technically the HP-9810 and HP-9820 are nearly identical. They are only different in their keyboards, displays and firmware. The embedded 2116 emulates a calculator with AOL (Algebraic Oriented Language). This was a concession to those users who weren't able to become friends with the UPN of the 9810. Because HP used a 5*7 dot matrix for the display, it was possible to show an arithmetic term in the following form:

         5X + (3Y+Z) / 2 --> A

The firmware at this calculator could also be extended by ROM-cassettes. Further a lot of peripherical devices could be connected.