The Hewlett-Packard HP-41CV, released in 1980, was a landmark programmable scientific calculator from the HP-41 series. It introduced continuous memory (CV = "Continuous Memory") and expanded capabilities over the original HP-41C, making it one of the most powerful and expandable handheld calculators ever produced. It was a favorite among engineers, scientists, surveyors, and hobbyists who needed a portable computer-like device in the pre-laptop era.
Hewlett-Packard (HP), based in Palo Alto, California, was the leader in programmable calculators. The HP-41 series was developed by HP's Advanced Products Division, building on the success of the HP-35 (1972) and HP-67 (1976). The HP-41CV was designed for professionals requiring large programs and persistent memory, competing with Texas Instruments' TI-59 but offering superior expandability and user interface.
Introduced in late 1980 at $325 (later ~$250), the HP-41CV was an upgrade to the HP-41C (1979) with 2,233 bytes of continuous memory instead of 63 registers. It sold hundreds of thousands, remaining popular through the 1980s. Production ended in the late 1980s as LCD models and early laptops emerged. It was a bestseller in engineering and surveying fields, with strong aftermarket support.
The HP-41CV used custom HP LSI chips. Key features included:
The continuous memory preserved programs and data even when off—revolutionary for the time.
Programming was keystroke-based with labels, branching, subroutines, and indirect addressing. Users wrote complex routines for engineering, surveying, finance, and games. HP published extensive application packs (e.g., Surveying, Statistics). Expandability via modules (e.g., HP-82143A printer, HP-82161A cassette, HP-IL interface) turned it into a portable computer. It supported bar code scanning and IR printers later.
The HP-41CV was a "pocket computer" in calculator form, with expandability unmatched until laptops. It was used by NASA, surveyors, and engineers for fieldwork. Its continuous memory and I/O ports inspired future devices. As a collectible, surviving units are highly prized, often restored with new batteries and modules. The HP-41 series, including the CV, remains a legend in calculator history for its power and versatility.