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HP-45: Science, Emulators & Overview

The HP-45 is the second scientific pocket calculator introduced by Hewlett-Packard, adding to the features of the HP-35. It was introduced in 1973 with an MSRP of US$395 (equivalent to $2,865 in 2025). Especially noteworthy was its pioneering addition of a shift key that gave other keys alternate functions.

Language: English [EN]
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HP-45 topic overview

The analysis highlights Science, Emulators and Overview as prominent areas in the source structure around HP-45.

Related topics
17
Source areas
2
Connected nodes
19
Extracted relationships
12
Concept neighborhoods
11
Bridge connections
19

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

Overview · 9 topics
Emulators · 8 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Dimensions
Length: 5.8 inches (150 mm), width: 3.2 inches (81 mm), height: 0.7–1.3 inches (18–33 mm)
Discontinued
1976
Display size
15 digits (decimal point uses one digit), (±10±99)
Display type
Red LED seven-segment display
Entry mode
RPN
Introduced
1973

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

Emulators

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How HP-45 connects Entity context

The extracted context around HP-45 shows recurring relationship patterns in the source. For example, HP-45 → Length: 5.8 inches (150 mm), width: 3.2 inches (81 mm), height: 0.7–1.3 inches (18–33 mm) Another extracted example is HP-45 → 1976. Use these groups to spot repeated connection types before inspecting the individual relationships.

HP-45

Top relations

Dimensions · 1
HP-45 → Length: 5.8 inches (150 mm), width: 3.2 inches (81 mm), height: 0.7–1.3 inches (18–33 mm)
Discontinued · 1
HP-45 → 1976
Display size · 1
HP-45 → 15 digits (decimal point uses one digit), (±10±99)
Display type · 1
HP-45 → Red LED seven-segment display
Entry mode · 1
HP-45 → RPN
Introduced · 1
HP-45 → 1973
Memory register · 1
HP-45 → Four-register operational stack with nine addressable memory registers + LASTx register
Power supply · 1
HP-45 → Internal rechargeable battery or 115/230 V AC, 5 W
Programming language(s) · 1
HP-45 → RPN key stroke
Type · 1
HP-45 → Scientific

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

calculator introduced mode stopwatch key us second accurate scientific pocket display emulators hewlett-packard hp-35 msrp hp-55 calculators adding features 1973

HP-45 relationships Subject–Predicate–Object triples

TTTA extracted 12 structured relationships around HP-45. Examples in this analysis include HP-45 → Dimensions → Length: 5.8 inches (150 mm), width: 3.2 inches (81 mm), height: 0.7–1.3 inches (18–33 mm) and HP-45 → Discontinued → 1976. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
HP-45DimensionsLength: 5.8 inches (150 mm), width: 3.2 inches (81 mm), height: 0.7–1.3 inches (18–33 mm)1.00infobox
HP-45Discontinued19761.00infobox
HP-45Display size15 digits (decimal point uses one digit), (±10±99)1.00infobox
HP-45Display typeRed LED seven-segment display1.00infobox
HP-45Entry modeRPN1.00infobox
HP-45Introduced19731.00infobox
HP-45Memory registerFour-register operational stack with nine addressable memory registers + LASTx register1.00infobox
HP-45Power supplyInternal rechargeable battery or 115/230 V AC, 5 W1.00infobox
HP-45Programming language(s)RPN key stroke1.00infobox
HP-45TypeScientific1.00infobox
HP-45WeightCalculator: 9 oz (260 g), recharger: 5 oz (140 g)1.00infobox
HP-45is asecond scientific pocket calculator introduced by Hewlett-Packard0.90text

Related concept clusters Concept neighborhoods

The concept neighborhoods around HP-45 bring nearby vocabulary together. In this analysis, examples include Display, Pocket and Scientific. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • scientific pocket calculator
    • Pocket
    • Scientific
    • Introduced
    • Calculators
    • Emulators
    • Display
    • Hp-45
    • Second
    • Adding
    • Code
    • Code-named
    • Features
  • HP-45
    • Display
    • Pocket
    • Scientific
    • Second
    • Introduced
    • Mode
    • Calculator
    • Adding
    • Calculators
    • Emulators
    • Features
    • Hewlett-packard
  • hp-45
    • Display
    • Pocket
    • Scientific
    • Second
    • Introduced
    • Mode
    • Calculator
    • Adding
    • Calculators
    • Emulators
    • Features
    • Hewlett-packard
  • shift key
    • Addition
    • Alternate
    • Especially
    • Functions
    • Gave
    • Keys
    • Noteworthy
    • Pioneering
    • Calculators
    • Emulators
    • Key
    • Shift
  • hewlett-packard
    • Adding
    • Features
    • Hp-35
    • Pocket
    • Scientific
    • Second
    • Introduced
    • Hp-45
  • emulators
    • Calculators
    • Pocket
    • Scientific
    • Introduced
    • Key
    • Mode
    • Hp-45
  • us$
    • 865in
    • Equivalent
    • Msrp
    • Introduced
    • Key
    • Calculator
  • hp-35
    • Pocket
    • Scientific
    • Second
    • Introduced
    • Hp-45

Connections between topic areas Semantic bridges

For HP-45, one of the stronger structural bridges in this analysis connects HP-45 with Overview. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
HP-45 — Overview · splits 10 ⟂ 10
HP-45 — Emulators · splits 11 ⟂ 9

Map overview Semantic statistics

HP-45

Nodes20
Edges19
Triples12
Avg. degree1.9
Density0.1
Components1

Source & methodology

TTTA analyzes the structure around HP-45 to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as Science, Emulators & Overview, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — HP-45 · EN edition · Analysis: TopicsToTalkAbout

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