Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

Epson HX-20

The HX-20 (also known as the HC-20) was an early laptop computer released by Seiko Epson in July 1982. It was the first notebook-sized portable computer, occupying roughly the footprint of an A4 notebook while being lightweight enough to hold comfortably with one hand at 1.6 kilograms (3.5 lb) and small enough to fit inside an average briefcase.

History, Applications, Literary Connections & Products

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Research this topic

Explore the main themes, entities and connections around Epson HX-20. Start with the topic map, then use the sections below for research and deeper semantic analysis.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

Key facts & relationships

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

Also known as
HC-20
CPU
Two Hitachi 6301 CPUs at 614 kHz
Dimensions
A4 Sized
Display
4 lines x 20 characters LCD
Graphics
120 × 32-pixel
Input
Full-transit keyboard

Topics to explore

Browse the full topic structure. Each item opens a new analysis centered on that subject.

Overview

History

Features

Reception

Use in college prank

LCD

  • ICs Integrated circuit

Monitor

Memory map

Similar Epson models

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.

Map overview Semantic statistics

Epson HX-20

Nodes59
Edges58
Triples53
Avg. degree1.97
Density0.033898
Components1

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

Epson HX-20

Top relations

related to history · 14
Epson HX-20 → COMDEX, Epson, HC-20, HX-20, It, Japan, Japanese Seiko Group, July, Las Vegas, North America, Seiko Epson, Suwa Seikosha, The, Yukio Yokozawa
related to External links · 13
Epson HX-20 → Ahl, CREATIVE COMPUTING VOL, David, HC-20, HX-20, HX-20 Archived, HX-20https, HXTape, MARCH, NO, PAGE, The World's First Laptop, Wayback Machine1983 Epson HX-20
related to Features · 13
Epson HX-20 → Actual, CPUs, DIN, Epson, EPSON BASIC, Hitachi, HX-20, It, LCD, Motorola, RAM, RS-232, The Epson HX-20
Also known as · 1
Epson HX-20 → HC-20
CPU · 1
Epson HX-20 → Two Hitachi 6301 CPUs at 614 kHz
Dimensions · 1
Epson HX-20 → A4 Sized
Display · 1
Epson HX-20 → 4 lines x 20 characters LCD
Graphics · 1
Epson HX-20 → 120 × 32-pixel
Input · 1
Epson HX-20 → Full-transit keyboard
Introductory price · 1
Epson HX-20 → US$795 (today $2570)

Important terminology Word statistics

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

Important terminology

hx-20 epson computer also basic first rom program lcd monitor hc-20 notebook used two known july released memory roms 1983

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Epson HX-20Also known asHC-201.00infobox
Epson HX-20CPUTwo Hitachi 6301 CPUs at 614 kHz1.00infobox
Epson HX-20DimensionsA4 Sized1.00infobox
Epson HX-20Display4 lines x 20 characters LCD1.00infobox
Epson HX-20Graphics120 × 32-pixel1.00infobox
Epson HX-20InputFull-transit keyboard1.00infobox
Epson HX-20Introductory priceUS$795 (today $2570)1.00infobox
Epson HX-20ManufacturerEpson1.00infobox
Epson HX-20Memory16 KB RAM expandable to 32 KB 32 KB ROM expandable to 64 KB1.00infobox
Epson HX-20Powerrechargeable nickel-cadmium batteries1.00infobox
Epson HX-20ReleasedJuly 1982; 44 years ago (July 1982)1.00infobox
Epson HX-20TypeNotebook computer1.00infobox
Epson HX-20WeightApproximately 1.6 kg1.00infobox

Related concept clusters Concept neighborhoods

These clusters group vocabulary that occurs around closely connected concepts in the source material.

    Connections between topic areas Semantic bridges

    Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

    Min side: 3
    For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.