HP-41CV

Hewlett-Packard’s HP-41CV, introduced as a memory-enhanced variant of the HP-41C, shipped with 2.2K bytes of internal memory and 320 registers, enabling significantly expanded programmability while maintaining full peripheral compatibility with the broader HP-41 system.

The HP-41CV’s defining trait was its memory capacity: 2.2K bytes spread across 320 registers, including a permanent .END. register⁸⁹. This quintupled the memory of the HP-41C, which held only 63 registers²³. Despite this expansion, the documentation emphasizes that neither the HP-41C nor HP-41CV could exceed 319 usable memory registers²³, a ceiling likely due to firmware or addressing constraints, though the exact reason is not stated in surviving materials.

Physically, the HP-41CV retained the slanted keyboard design of its predecessor¹, a deliberate ergonomic choice that influenced hand position during extended use. Four I/O ports on the rear allowed daisy-chaining of peripherals, a modular approach central to HP’s vision of the calculator as a portable system controller¹⁰. The HP-IL Interface Module (HP 82160A) plugged into one of these ports, enabling communication with devices such as the HP 82143A Printer/Plotter, HP 82104A Card Reader, HP 82161A Digital Cassette, and HP 82163A Video Interface⁵¹⁰¹³. The optical wand was also supported, allowing barcode-style data entry from printed programs¹⁴.

Alphanumeric capability distinguished the HP-41CV from simpler calculators of the era. It could process text input through key code detection, using two distinct coding schemes: one based on key topology and another derived from ASCII¹². This allowed labeled output, custom prompts, and rudimentary user interfaces, features utilized by software packs like the MATH PAC, STATISTICS PAC, and SURVEYING PAC⁵¹⁵. The system’s flexibility was further extended by modules such as the X FUNCTIONS (HP 82180A) and X MEMORY (HP 82181A), which enhanced computational and storage capabilities⁸⁹.

HP marketed the HP-41CV as part of configurable systems. The HP-41 System I bundled the calculator with the HP 82104A Card Reader for $399 (list $495)¹¹¹¹⁴. System II added the HP 82143A Printer/Plotter, priced at $679 (list $840)¹¹¹¹⁴. At launch, the standalone unit retailed for $325, with dealer cost estimates ranging from $256 to $270¹⁴⁵. By 1986, street pricing had dropped to $130.95¹⁶.

The HP-41CV was not a radical departure but a targeted upgrade. Documentation explicitly states it differed from the HP-41C only in the size of its built-in memory²³. Later, the HP-41CX would surpass it with extended functions, though the CV remained suitable for most advanced software⁸⁹. Indicators on the display provided continuous feedback on operating mode and battery status²³, a small but critical usability feature in field use.

Specifications

References

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