HP-34C

[3][1] Programming features such as indirect jumps provides substantial capability to the calculator's programmer.

The HP-34C shipped with an "applications" manual that included two games (Moon Rocket Lander and Nimb).

A game of blackjack was easily programmable by converting some of the registers to lines of program.

Although it is argued the HP-41C (introduced late 1979 and only a matter of months after the HP-34C) was a replacement for the HP-34C, they were in fact differentiated as much by price (the HP-34C being 50% that of the HP-41C) as by functionality and performance (the HP-41C being the first HP LCD-based and module-expandable calculator, with its standard functionality lacking the root-finding and integration capabilities as well as the gamma-function implementation of the HP-34C though).

This price difference allowed those with economic constraints to still buy a high-end HP (HP-34C) scientific programmable within a reasonable cost.