HP-19C calculator
HP-29C with AC-powered battery charger

The HP-19C and HP-29C were scientific/engineering pocket calculators made by Hewlett-Packard between 1977 and 1979. They were the most advanced and last models of the "20" family (compare HP-25) and included Continuous Memory (battery-backed CMOS memory) as a standard feature.

The HP-19C included a small thermal printer, one of the very few hand-held scientific calculators to offer such a feature (HP-91, HP-92 and HP-97 were desktop units and later models like the HP-41C only supported external printers). Due to the printer's power requirements, the 19C used a battery pack of four AA-sized NiCd cells, adding to the weight of the calculator and printer mechanism.

All other capabilities were the same in both models  RPN expression logic, 98 program memory locations, statistical functions, and 30 registers.

Users could develop software for the HP-29C/19C, such as a prime number generator.[1] The calculators expanded the HP-25's program capabilities by adding subroutines, increment/decrement looping, relative branching and indirect addressing (via register 0 as index).

HP's internal code name for the 29C was Bonnie, the 19C was correspondingly named Clyde.

The HP-19C and HP-29C were introduced at MSRPs of $345[2] and $195,[3] respectively.

A version adapted to support an additional backward-facing display manufactured by Educational Calculator Devices named EduCALC 29C GD existed as well.[4]

Simulators and emulators

HP-29C microcode emulator for any platform

    HP-29C microcode emulator for Windows

    References

    1. Aslan, Wilfred (1980-10-01). "Prime Numbers on the HP-19C". BYTE. pp. 54–58. Retrieved 2015-12-21.
    2. $345 in 1980 ≈ $910 in 2010 (see Inflation Conversion Factors for Dollars Archived 2007-12-30 at the Wayback Machine)
    3. $195 in 1980 ≈ $510 in 2010 (ibid.)
    4. Augustine, M. (2014-04-25). "Educalc 29C GD - any information for me?". The Museum of HP Calculators. Archived from the original on 2021-02-05. Retrieved 2022-07-01.
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